Quarterly report pursuant to Section 13 or 15(d)

CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (UNAUDITED)

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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 Loss [Member]
Noncontrolling Interests [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 10,870   10,870          
Common Stock issued under stock plans, net of shares withheld for employee taxes (7,946) $ 3 (7,949)          
Common stock issued under stock plans, net of shares withheld for employee taxes (in shares)   287,809            
Exercise of stock options, net of shares withheld for option cost and employee taxes 7,922 $ 4 7,918          
Exercise of stock options (in shares)   469,216            
Fair value of convertible debt conversion feature, net of issuance costs 62,624   62,624          
Repurchase of convertible debt conversion feature (83,416)   (83,416)          
Acquisitions 13,449           13,449  
Purchases of noncontrolling interests 73   566       (493)  
Redeemable noncontrolling interests fair value adjustments (16,532)   (16,532)          
Contributions received 4,900           4,900  
Cash distributions (16,277)           (16,277)  
Other 40   31       9  
Comprehensive loss:                
Net loss (37,892)     (33,906)     (3,986)  
Foreign currency translation adjustments 16,262         16,262    
Balances at Mar. 31, 2018 1,372,221 $ 2,076 2,348,118 (1,113,378) (6,865) (92,280) 234,550  
Balances (in shares) at Mar. 31, 2018   207,634,062            
Balances at Dec. 31, 2017               $ 244,727
Redeemable Noncontrolling Interests [Roll Forward]                
Acquisitions               10,181
Purchases of noncontrolling interests               (358)
Redeemable noncontrolling interests fair value adjustments               16,532
Contributions received               0
Cash distributions               (3,246)
Other               0
Comprehensive loss:                
Net loss               (3,136)
Balances at Mar. 31, 2018               264,700
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 13,238   13,238          
Common Stock issued under stock plans, net of shares withheld for employee taxes (9,300) $ 3 (9,303)          
Common stock issued under stock plans, net of shares withheld for employee taxes (in shares)   252,634            
Exercise of stock options, net of shares withheld for option cost and employee taxes 7,672 $ 5 7,667          
Exercise of stock options (in shares)   469,601            
Acquisitions 974           974  
Purchases of noncontrolling interests 0   270       (270)  
Redeemable noncontrolling interests fair value adjustments (12,312)   (12,312)          
Cash distributions (45,943)           (45,943)  
Other (1,192)   (8)       (1,184)  
Comprehensive loss:                
Net loss (52,597)     (52,444)     (153)  
Foreign currency translation adjustments (2,889)         (2,889)    
Balances at Mar. 31, 2019 1,240,394 $ 2,099 $ 2,267,761 $ (1,071,667) $ (6,865) $ (148,120) $ 197,186  
Balances (in shares) at Mar. 31, 2019   209,857,816            
Balances at Dec. 31, 2018 329,355             329,355
Redeemable Noncontrolling Interests [Roll Forward]                
Acquisitions               6,981
Purchases of noncontrolling interests               (1,459)
Redeemable noncontrolling interests fair value adjustments               12,312
Cash distributions               (3,941)
Other               2,425
Comprehensive loss:                
Net loss               (2,644)
Balances at Mar. 31, 2019 $ 343,029             $ 343,029