GOODWILL AND OTHER INTANGIBLE ASSETS - Changes in Carrying Amount of Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Finite-lived and Indefinite-lived Intangible Assets [Roll Forward]
Beginning of period			$ 1,861,973	$ 1,842,561	$ 1,842,561
Intangible assets acquired during the period			15,495		35,564
Valuation adjustments for prior year acquisitions			7,806		168,979
Intangible write-offs due to disposition and amounts reclassified to assets held for sale			(2,800)		(15,961)
Impairments during the period			(11,971)		(1,406)
Intangible amortization during the period	$ (29,905)	$ (33,128)	(88,475)	$ (102,311)	(129,300)
Changes due to foreign currency fluctuations			36,050		(38,464)
End of period	$ 1,818,078		$ 1,818,078		$ 1,861,973