GOODWILL AND INTANGIBLE ASSETS - Definite lived intangible assets (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
Definite lived intangible assets [Abstract]
Beginning Balance, Carrying Value, Gross		$ 252,956
(Decrease)/Increase, Carrying Value, Gross	[1]	(2,435)
Ending Balance, Carrying Value, Gross		250,521
Beginning Balance, Accumulated Amortization		(146,773)
(Increase)/Decrease, Accumulated Amortization	[2]	(13,350)
Ending Balance, Accumulated Amortization		(160,123)
Beginning Balance, Intangible Assets, Net		106,183
Ending Balance, Intangible Assets, Net		90,398
Intangible Assets [Roll Forward]
Beginning Balance, Carrying Value, Gross		252,956
(Decrease)/Increase, Carrying Value, Gross	[1]	9,565
Ending Balance, Carrying Value, Gross		262,521
Intangible assets, net		102,398	$ 106,183
Decrease in carrying value related to foreign currency translation		3,900
Decrease in accumulated amortization from foreign currency translation		1,000
Customer Relationships [Member]
Definite lived intangible assets [Abstract]
Beginning Balance, Carrying Value, Gross		75,229
(Decrease)/Increase, Carrying Value, Gross	[1]	(1,006)
Ending Balance, Carrying Value, Gross		74,223
Beginning Balance, Accumulated Amortization		(27,301)
(Increase)/Decrease, Accumulated Amortization	[2]	(4,551)
Ending Balance, Accumulated Amortization		(31,852)
Beginning Balance, Intangible Assets, Net		47,928
Ending Balance, Intangible Assets, Net		$ 42,371
Weighted Average Useful Life		11 years
Developed technologies [Member]
Definite lived intangible assets [Abstract]
Beginning Balance, Carrying Value, Gross		$ 75,194
(Decrease)/Increase, Carrying Value, Gross	[1]	(1,856)
Ending Balance, Carrying Value, Gross		73,338
Beginning Balance, Accumulated Amortization		(29,367)
(Increase)/Decrease, Accumulated Amortization	[2]	(4,592)
Ending Balance, Accumulated Amortization		(33,959)
Beginning Balance, Intangible Assets, Net		45,827
Ending Balance, Intangible Assets, Net		$ 39,379
Weighted Average Useful Life		10 years
Trademarks and tradenames [Member]
Definite lived intangible assets [Abstract]
Beginning Balance, Carrying Value, Gross		$ 17,793
(Decrease)/Increase, Carrying Value, Gross	[1]	(30)
Ending Balance, Carrying Value, Gross		17,763
Beginning Balance, Accumulated Amortization		(9,778)
(Increase)/Decrease, Accumulated Amortization	[2]	(3,365)
Ending Balance, Accumulated Amortization		(13,143)
Beginning Balance, Intangible Assets, Net		8,015
Ending Balance, Intangible Assets, Net		$ 4,620
Weighted Average Useful Life		5 years
Other contractual agreements [Member]
Definite lived intangible assets [Abstract]
Beginning Balance, Carrying Value, Gross		$ 2,978
(Decrease)/Increase, Carrying Value, Gross	[1]	(89)
Ending Balance, Carrying Value, Gross		2,889
Beginning Balance, Accumulated Amortization		(2,978)
(Increase)/Decrease, Accumulated Amortization	[2]	89
Ending Balance, Accumulated Amortization		(2,889)
Beginning Balance, Intangible Assets, Net		0
Ending Balance, Intangible Assets, Net		$ 0
Weighted Average Useful Life		2 years
Licenses [Member]
Definite lived intangible assets [Abstract]
Beginning Balance, Carrying Value, Gross		$ 81,762
(Decrease)/Increase, Carrying Value, Gross	[1]	546
Ending Balance, Carrying Value, Gross		82,308
Beginning Balance, Accumulated Amortization		(77,349)
(Increase)/Decrease, Accumulated Amortization	[2]	(931)
Ending Balance, Accumulated Amortization		(78,280)
Beginning Balance, Intangible Assets, Net		4,413
Ending Balance, Intangible Assets, Net		$ 4,028
Weighted Average Useful Life		14 years
In Process Research and Development [Member]
Indefinite-lived Intangible Assets [Roll Forward]
Beginning Balance, Carrying Value, Gross		$ 0
(Decrease)/Increase, Carrying Value, Gross	[1]	12,000
Ending Balance, Carrying Value, Gross		$ 12,000

[1] Includes additions in connection with the Acquisition in 2015 and a decrease in carrying value of $3.9 million related to foreign currency translation.

[2] The impact of foreign currency translation on accumulated amortization was a decrease of $1.0 million.