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SEGMENT INFORMATION - Expenses (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Segment information        
Operating income $ 339,573 $ 317,372 $ 977,108 $ 931,675
Stock-based compensation expense 14,100 13,300 42,400 39,300
Corporate and unallocated        
Segment information        
Operating income (62,920) (59,952) (196,380) (179,719)
Payroll costs 42,100 37,900 129,900 114,000
Stock-based compensation expense 14,000 13,300 42,400 39,300
Professional service expenses 12,300 11,900 36,500 38,300
Other operating expenses $ 8,500 $ 10,100 $ 30,000 $ 27,500