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GOODWILL AND OTHER INTANGIBLE ASSETS - Balances and Changes in Intangible Assets, Net (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]    
Weighted average life 8 years 2 months  
Finite-lived intangible assets, accumulated amortization $ 634,712 $ 563,892
Intangible assets, gross (excluding goodwill) 1,216,986 1,150,018
Intangible assets, net (excluding goodwill) 582,274 586,126
Trade names and other [Member]    
Indefinite-lived Intangible Assets [Line Items]    
Indefinite-lived intangible assets $ 136,333 128,282
Customer relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Weighted average life 13 years 9 months 12 days  
Finite-lived intangible assets, gross $ 428,041 424,405
Finite-lived intangible assets, accumulated amortization 190,395 175,112
Finite-lived intangible assets, net $ 237,646 249,293
Trade names and other [Member]    
Finite-Lived Intangible Assets [Line Items]    
Weighted average life 13 years 5 months 18 days  
Finite-lived intangible assets, gross $ 25,960 25,353
Finite-lived intangible assets, accumulated amortization 15,611 14,262
Finite-lived intangible assets, net $ 10,349 11,091
Capitalized software [Member]    
Finite-Lived Intangible Assets [Line Items]    
Weighted average life 4 years 1 month 12 days  
Finite-lived intangible assets, gross $ 626,652 571,978
Finite-lived intangible assets, accumulated amortization 428,706 374,518
Finite-lived intangible assets, net $ 197,946 $ 197,460