GOODWILL AND OTHER INTANGIBLE ASSETS - Rollforward of Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Finite-lived and Indefinite-lived Intangible Assets [Roll Forward]
Beginning of period	$ 1,842,561	$ 909,645	$ 909,645
Intangible assets acquired during the year, net	8,436		1,052,016
Impairments during the year			(4,177)
Amortization during the year	(18,274)	$ (8,797)	(45,498)
Changes due to foreign currency fluctuations	8,121		(69,425)
End of period	$ 1,840,844		$ 1,842,561