CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (UNAUDITED) - USD ($) $ in Thousands |
Total |
Common Stock [Member] |
Additional Paid-in Capital [Member] |
Accumulated Deficit [Member] |
Cost of Shares Held in Treasury [Member] |
Accumulated Other Comprehensive Income (Loss) [Member] |
Noncontrolling Interest [Member] |
Redeemable Noncontrolling Interests [Member] |
Balances at Dec. 31, 2017 |
$ 1,418,144
|
$ 2,069
|
$ 2,374,006
|
$ (1,079,472)
|
$ (6,865)
|
$ (108,542)
|
$ 236,948
|
|
Balances (in shares) at Dec. 31, 2017 |
|
206,877,037
|
|
|
|
|
|
|
Equity [Roll Forward] |
|
|
|
|
|
|
|
|
Non-cash and stock-based compensation |
34,415
|
|
34,415
|
|
|
|
|
|
Common stock issued under stock plans, net of shares withheld for employee taxes |
(8,685)
|
$ 4
|
(8,689)
|
|
|
|
|
|
Common stock issued under stock plans, net of shares withheld for employee taxes (in shares) |
|
365,502
|
|
|
|
|
|
|
Exercise of stock options, net of shares withheld for option cost and employee taxes |
16,447
|
$ 10
|
16,437
|
|
|
|
|
|
Exercise of stock options, net of shares withheld for option cost and employee taxes (in shares) |
|
1,016,963
|
|
|
|
|
|
|
Fair value of convertible debt conversion feature, net of issuance costs |
62,624
|
|
62,624
|
|
|
|
|
|
Repurchase of convertible debt conversion feature |
(92,641)
|
|
(92,641)
|
|
|
|
|
|
Acquisitions |
21,770
|
|
|
|
|
|
21,770
|
|
Noncontrolling Interest, Decrease from Deconsolidation |
(6,684)
|
|
|
|
|
|
(6,684)
|
|
Purchases of noncontrolling interests |
(6,310)
|
|
(4,784)
|
|
|
|
(1,526)
|
|
Sales of noncontrolling interests |
430
|
|
1,410
|
|
|
|
(980)
|
|
Redeemable noncontrolling interests fair value adjustments |
(54,246)
|
|
(54,246)
|
|
|
|
|
|
Contributions received |
7,501
|
|
|
|
|
|
7,501
|
|
Cash distributions |
(33,481)
|
|
|
|
|
|
(33,481)
|
|
Other |
(2,546)
|
|
(107)
|
|
|
|
(2,439)
|
|
Comprehensive income (loss): |
|
|
|
|
|
|
|
|
Net income |
220,567
|
|
|
208,136
|
|
|
12,431
|
|
Foreign currency translation adjustments |
(26,376)
|
|
|
|
|
(26,376)
|
|
|
Balances at Sep. 30, 2018 |
1,550,929
|
$ 2,083
|
2,328,425
|
(871,336)
|
(6,865)
|
(134,918)
|
233,540
|
|
Balances (in shares) at Sep. 30, 2018 |
|
208,259,502
|
|
|
|
|
|
|
Balances at Dec. 31, 2017 |
|
|
|
|
|
|
|
$ 244,727
|
Redeemable Noncontrolling Interests [Roll Forward} |
|
|
|
|
|
|
|
|
Acquisitions |
|
|
|
|
|
|
|
20,911
|
Purchases of noncontrolling interests |
|
|
|
|
|
|
|
(10,356)
|
Redeemable noncontrolling interests fair value adjustments |
|
|
|
|
|
|
|
54,246
|
Contribution received |
|
|
|
|
|
|
|
1,806
|
Cash distributions |
|
|
|
|
|
|
|
(7,870)
|
Other |
|
|
|
|
|
|
|
28
|
Comprehensive income (loss): |
|
|
|
|
|
|
|
|
Net income (loss) |
|
|
|
|
|
|
|
4,958
|
Balances at Sep. 30, 2018 |
|
|
|
|
|
|
|
308,450
|
Balances at Jun. 30, 2018 |
1,405,520
|
$ 2,079
|
2,337,691
|
(1,044,019)
|
(6,865)
|
(125,837)
|
242,471
|
|
Balances (in shares) at Jun. 30, 2018 |
|
207,869,835
|
|
|
|
|
|
|
Equity [Roll Forward] |
|
|
|
|
|
|
|
|
Non-cash and stock-based compensation |
11,095
|
|
11,095
|
|
|
|
|
|
Common stock issued under stock plans, net of shares withheld for employee taxes |
(83)
|
$ 0
|
(83)
|
|
|
|
|
|
Common stock issued under stock plans, net of shares withheld for employee taxes (in shares) |
|
5,685
|
|
|
|
|
|
|
Exercise of stock options, net of shares withheld for option cost and employee taxes |
5,593
|
$ 4
|
5,589
|
|
|
|
|
|
Exercise of stock options, net of shares withheld for option cost and employee taxes (in shares) |
|
383,982
|
|
|
|
|
|
|
Acquisitions |
(634)
|
|
|
|
|
|
(634)
|
|
Noncontrolling Interest, Decrease from Deconsolidation |
(6,684)
|
|
|
|
|
|
(6,684)
|
|
Purchases of noncontrolling interests |
(6,383)
|
|
(6,493)
|
|
|
|
110
|
|
Sales of noncontrolling interests |
430
|
|
1,410
|
|
|
|
(980)
|
|
Redeemable noncontrolling interests fair value adjustments |
(20,790)
|
|
(20,790)
|
|
|
|
0
|
|
Contributions received |
2,601
|
|
|
|
|
|
2,601
|
|
Cash distributions |
(10,212)
|
|
|
|
|
|
(10,212)
|
|
Other |
25
|
|
6
|
|
|
|
19
|
|
Comprehensive income (loss): |
|
|
|
|
|
|
|
|
Net income |
179,532
|
|
|
172,683
|
|
|
6,849
|
|
Foreign currency translation adjustments |
(9,081)
|
|
|
|
|
(9,081)
|
|
|
Balances at Sep. 30, 2018 |
1,550,929
|
$ 2,083
|
2,328,425
|
(871,336)
|
(6,865)
|
(134,918)
|
233,540
|
|
Balances (in shares) at Sep. 30, 2018 |
|
208,259,502
|
|
|
|
|
|
|
Balances at Jun. 30, 2018 |
|
|
|
|
|
|
|
293,194
|
Redeemable Noncontrolling Interests [Roll Forward} |
|
|
|
|
|
|
|
|
Acquisitions |
|
|
|
|
|
|
|
(959)
|
Purchases of noncontrolling interests |
|
|
|
|
|
|
|
(10,000)
|
Redeemable noncontrolling interests fair value adjustments |
|
|
|
|
|
|
|
20,790
|
Contribution received |
|
|
|
|
|
|
|
1,806
|
Cash distributions |
|
|
|
|
|
|
|
4
|
Other |
|
|
|
|
|
|
|
(50)
|
Comprehensive income (loss): |
|
|
|
|
|
|
|
|
Net income (loss) |
|
|
|
|
|
|
|
3,665
|
Balances at Sep. 30, 2018 |
|
|
|
|
|
|
|
308,450
|
Balances at Dec. 31, 2018 |
1,342,743
|
$ 2,091
|
2,268,209
|
(1,019,223)
|
(6,865)
|
(145,231)
|
243,762
|
|
Balances (in shares) at Dec. 31, 2018 |
|
209,135,581
|
|
|
|
|
|
|
Equity [Roll Forward] |
|
|
|
|
|
|
|
|
Non-cash and stock-based compensation |
37,022
|
|
37,022
|
|
|
|
|
|
Common stock issued under stock plans, net of shares withheld for employee taxes |
(10,578)
|
$ 3
|
(10,581)
|
|
|
|
|
|
Common stock issued under stock plans, net of shares withheld for employee taxes (in shares) |
|
322,314
|
|
|
|
|
|
|
Exercise of stock options, net of shares withheld for option cost and employee taxes |
13,240
|
$ 9
|
13,231
|
|
|
|
|
|
Exercise of stock options, net of shares withheld for option cost and employee taxes (in shares) |
|
843,833
|
|
|
|
|
|
|
Conversion of convertible debt |
28,586
|
$ 8
|
28,578
|
|
|
|
|
|
Conversion of convertible debt (in shares) |
|
824,328
|
|
|
|
|
|
|
Acquisitions |
30,958
|
|
|
|
|
|
30,958
|
|
Purchases of noncontrolling interests |
(27,541)
|
|
(24,576)
|
|
|
|
(2,965)
|
|
Redeemable noncontrolling interests fair value adjustments |
(49,407)
|
|
(49,407)
|
|
|
|
|
|
Contributions received |
13,124
|
|
|
|
|
|
13,124
|
|
Cash distributions |
(60,300)
|
|
|
|
|
|
(60,300)
|
|
Other |
(1,555)
|
|
(15)
|
|
|
|
(1,540)
|
|
Comprehensive income (loss): |
|
|
|
|
|
|
|
|
Net income |
242,356
|
|
|
229,836
|
|
|
12,520
|
|
Foreign currency translation adjustments |
(35,816)
|
|
|
|
|
(35,816)
|
|
|
Balances at Sep. 30, 2019 |
1,522,832
|
$ 2,111
|
2,262,461
|
(789,387)
|
(6,865)
|
(181,047)
|
235,559
|
|
Balances (in shares) at Sep. 30, 2019 |
|
211,126,056
|
|
|
|
|
|
|
Balances at Dec. 31, 2018 |
329,355
|
|
|
|
|
|
|
329,355
|
Redeemable Noncontrolling Interests [Roll Forward} |
|
|
|
|
|
|
|
|
Acquisitions |
|
|
|
|
|
|
|
39,303
|
Purchases of noncontrolling interests |
|
|
|
|
|
|
|
(1,459)
|
Redeemable noncontrolling interests fair value adjustments |
|
|
|
|
|
|
|
49,407
|
Contribution received |
|
|
|
|
|
|
|
0
|
Cash distributions |
|
|
|
|
|
|
|
(12,882)
|
Other |
|
|
|
|
|
|
|
2,597
|
Comprehensive income (loss): |
|
|
|
|
|
|
|
|
Net income (loss) |
|
|
|
|
|
|
|
12,495
|
Balances at Sep. 30, 2019 |
418,816
|
|
|
|
|
|
|
418,816
|
Balances at Jun. 30, 2019 |
1,407,756
|
$ 2,101
|
2,296,010
|
(968,312)
|
(6,865)
|
(148,791)
|
233,613
|
|
Balances (in shares) at Jun. 30, 2019 |
|
210,910,143
|
|
|
|
|
|
|
Equity [Roll Forward] |
|
|
|
|
|
|
|
|
Non-cash and stock-based compensation |
12,030
|
|
12,030
|
|
|
|
|
|
Common stock issued under stock plans, net of shares withheld for employee taxes |
(319)
|
$ 0
|
(319)
|
|
|
|
|
|
Common stock issued under stock plans, net of shares withheld for employee taxes (in shares) |
|
9,457
|
|
|
|
|
|
|
Exercise of stock options, net of shares withheld for option cost and employee taxes |
3,041
|
$ 2
|
3,039
|
|
|
|
|
|
Exercise of stock options, net of shares withheld for option cost and employee taxes (in shares) |
|
206,456
|
|
|
|
|
|
|
Conversion of convertible debt |
0
|
$ 8
|
(8)
|
|
|
|
|
|
Conversion of convertible debt (in shares) |
|
0
|
|
|
|
|
|
|
Acquisitions |
4,790
|
|
|
|
|
|
4,790
|
|
Purchases of noncontrolling interests |
(27,541)
|
|
(24,846)
|
|
|
|
(2,695)
|
|
Redeemable noncontrolling interests fair value adjustments |
(23,580)
|
|
(23,580)
|
|
|
|
|
|
Contributions received |
4,800
|
|
|
|
|
|
4,800
|
|
Cash distributions |
(8,185)
|
|
|
|
|
|
(8,185)
|
|
Other |
(144)
|
|
135
|
|
|
|
(279)
|
|
Comprehensive income (loss): |
|
|
|
|
|
|
|
|
Net income |
182,440
|
|
|
178,925
|
|
|
3,515
|
|
Foreign currency translation adjustments |
(32,256)
|
|
|
|
|
(32,256)
|
|
|
Balances at Sep. 30, 2019 |
1,522,832
|
$ 2,111
|
$ 2,262,461
|
$ (789,387)
|
$ (6,865)
|
$ (181,047)
|
$ 235,559
|
|
Balances (in shares) at Sep. 30, 2019 |
|
211,126,056
|
|
|
|
|
|
|
Balances at Jun. 30, 2019 |
|
|
|
|
|
|
|
385,328
|
Redeemable Noncontrolling Interests [Roll Forward} |
|
|
|
|
|
|
|
|
Acquisitions |
|
|
|
|
|
|
|
0
|
Purchases of noncontrolling interests |
|
|
|
|
|
|
|
0
|
Redeemable noncontrolling interests fair value adjustments |
|
|
|
|
|
|
|
23,580
|
Contribution received |
|
|
|
|
|
|
|
0
|
Cash distributions |
|
|
|
|
|
|
|
(1,624)
|
Other |
|
|
|
|
|
|
|
0
|
Comprehensive income (loss): |
|
|
|
|
|
|
|
|
Net income (loss) |
|
|
|
|
|
|
|
11,532
|
Balances at Sep. 30, 2019 |
$ 418,816
|
|
|
|
|
|
|
$ 418,816
|