Quarterly report pursuant to Section 13 or 15(d)

LONG-LIVED ASSETS (Definite-lived Intangibles) (Details)

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LONG-LIVED ASSETS (Definite-lived Intangibles) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Finite-lived Intangibles Asset [Roll Forward]    
Gross carrying amount $ 1,416,016  
Accumulated amortization (754,565)  
Net 661,451  
Acquisitions—current year 40,451  
Foreign exchange 1,210  
Other (26,714)  
Net change 14,947  
Amortization (47,240) $ (45,700)
Foreign exchange (994)  
Other 26,648  
Net change (21,586)  
Gross carrying amount 1,430,963  
Accumulated amortization (776,151)  
Net $ 654,812  
Weighted-average lives of definite-lived intangible assets 5 years  
Revenue-generating contracts [Member]    
Finite-lived Intangibles Asset [Roll Forward]    
Gross carrying amount $ 692,963  
Accumulated amortization (391,002)  
Net 301,961  
Acquisitions—current year 13,432  
Foreign exchange 516  
Other (13,109)  
Net change 839  
Amortization (17,909)  
Foreign exchange (478)  
Other 13,064  
Net change (5,323)  
Gross carrying amount 693,802  
Accumulated amortization (396,325)  
Net $ 297,477  
Weighted-average lives of definite-lived intangible assets 5 years  
Client/vendor relationships [Member]    
Finite-lived Intangibles Asset [Roll Forward]    
Gross carrying amount $ 393,772  
Accumulated amortization (213,599)  
Net 180,173  
Acquisitions—current year 7,801  
Foreign exchange (271)  
Other (13,000)  
Net change (5,470)  
Amortization (15,237)  
Foreign exchange (7)  
Other 13,000  
Net change (2,244)  
Gross carrying amount 388,302  
Accumulated amortization (215,843)  
Net $ 172,459  
Weighted-average lives of definite-lived intangible assets 3 years  
Trademarks and naming rights [Member]    
Finite-lived Intangibles Asset [Roll Forward]    
Gross carrying amount $ 123,707  
Accumulated amortization (41,808)  
Net 81,899  
Acquisitions—current year 1,632  
Foreign exchange 241  
Other 0  
Net change 1,873  
Amortization (3,406)  
Foreign exchange (37)  
Other (51)  
Net change (3,494)  
Gross carrying amount 125,580  
Accumulated amortization (45,302)  
Net $ 80,278  
Weighted-average lives of definite-lived intangible assets 3 years  
Technology [Member]    
Finite-lived Intangibles Asset [Roll Forward]    
Gross carrying amount $ 85,411  
Accumulated amortization (38,826)  
Net 46,585  
Acquisitions—current year 1,466  
Foreign exchange 425  
Other (605)  
Net change 1,286  
Amortization (5,867)  
Foreign exchange (239)  
Other 606  
Net change (5,500)  
Gross carrying amount 86,697  
Accumulated amortization (44,326)  
Net $ 42,371  
Weighted-average lives of definite-lived intangible assets 3 years  
Other Intangible Assets [Member]    
Finite-lived Intangibles Asset [Roll Forward]    
Gross carrying amount $ 120,163  
Accumulated amortization (69,330)  
Net 50,833  
Acquisitions—current year 16,120  
Foreign exchange 299  
Other 0  
Net change 16,419  
Amortization (4,821)  
Foreign exchange (233)  
Other 29  
Net change (5,025)  
Gross carrying amount 136,582  
Accumulated amortization (74,355)  
Net $ 62,227  
Weighted-average lives of definite-lived intangible assets 8 years