INCOME TAXES - Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets:
Compensation	$ 80,338	$ 91,729
Receivables	13,471	16,243
Other	11,433	9,242
Deferred tax liabilities:
Intangible assets	(131,698)	(133,375)
Prepaid assets	(14,540)	(13,418)
Long-lived assets	(21,268)	(18,666)
Other	(608)	(427)
Net deferred tax (liabilities) assets	$ (62,872)	$ (48,672)