GOODWILL AND INTANGIBLE ASSETS - Definite lived intangible assets (Details) (USD $)	12 Months Ended
	Dec. 31, 2014
Definite lived intangible assets [Abstract]
Beginning Balance, Carrying Value, Gross	$ 257,988,000
(Decrease)/Increase, Carrying Value, Gross	(5,032,000)	[1]
Ending Balance, Carrying Value, Gross	252,956,000
Beginning Balance, Accumulated Amortization	(126,880,000)
(Increase)/Decrease, Accumulated Amortization	(19,893,000)	[2]
Ending Balance, Accumulated Amortization	(146,773,000)
Beginning Balance, Intangible Assets, Net	131,108,000
Ending Balance, Intangible Assets, Net	106,183,000
Decrease in carrying value related to foreign currency translation	5,100,000
Decrease in accumulated amortization from foreign currency translation	1,000,000
Customer relationships [Member]
Definite lived intangible assets [Abstract]
Beginning Balance, Carrying Value, Gross	77,726,000
(Decrease)/Increase, Carrying Value, Gross	(2,497,000)	[1]
Ending Balance, Carrying Value, Gross	75,229,000
Beginning Balance, Accumulated Amortization	(21,534,000)
(Increase)/Decrease, Accumulated Amortization	(5,767,000)	[2]
Ending Balance, Accumulated Amortization	(27,301,000)
Beginning Balance, Intangible Assets, Net	56,192,000
Ending Balance, Intangible Assets, Net	47,928,000
Weighted Average Useful Life	11 years
Developed technologies [Member]
Definite lived intangible assets [Abstract]
Beginning Balance, Carrying Value, Gross	77,627,000
(Decrease)/Increase, Carrying Value, Gross	(2,433,000)	[1]
Ending Balance, Carrying Value, Gross	75,194,000
Beginning Balance, Accumulated Amortization	(24,370,000)
(Increase)/Decrease, Accumulated Amortization	(4,997,000)	[2]
Ending Balance, Accumulated Amortization	(29,367,000)
Beginning Balance, Intangible Assets, Net	53,257,000
Ending Balance, Intangible Assets, Net	45,827,000
Weighted Average Useful Life	10 years
Trademarks and tradenames [Member]
Definite lived intangible assets [Abstract]
Beginning Balance, Carrying Value, Gross	17,831,000
(Decrease)/Increase, Carrying Value, Gross	(38,000)	[1]
Ending Balance, Carrying Value, Gross	17,793,000
Beginning Balance, Accumulated Amortization	(6,404,000)
(Increase)/Decrease, Accumulated Amortization	(3,374,000)	[2]
Ending Balance, Accumulated Amortization	(9,778,000)
Beginning Balance, Intangible Assets, Net	11,427,000
Ending Balance, Intangible Assets, Net	8,015,000
Weighted Average Useful Life	5 years
Other contractual agreements [Member]
Definite lived intangible assets [Abstract]
Beginning Balance, Carrying Value, Gross	3,095,000
(Decrease)/Increase, Carrying Value, Gross	(117,000)	[1]
Ending Balance, Carrying Value, Gross	2,978,000
Beginning Balance, Accumulated Amortization	(2,342,000)
(Increase)/Decrease, Accumulated Amortization	(636,000)	[2]
Ending Balance, Accumulated Amortization	(2,978,000)
Beginning Balance, Intangible Assets, Net	753,000
Ending Balance, Intangible Assets, Net	0
Weighted Average Useful Life	2 years
Licenses [Member]
Definite lived intangible assets [Abstract]
Beginning Balance, Carrying Value, Gross	81,709,000
(Decrease)/Increase, Carrying Value, Gross	53,000	[1]
Ending Balance, Carrying Value, Gross	81,762,000
Beginning Balance, Accumulated Amortization	(72,230,000)
(Increase)/Decrease, Accumulated Amortization	(5,119,000)	[2]
Ending Balance, Accumulated Amortization	(77,349,000)
Beginning Balance, Intangible Assets, Net	9,479,000
Ending Balance, Intangible Assets, Net	$ 4,413,000
Weighted Average Useful Life	14 years

[1] Includes a decrease in carrying value of $5.1 million related to foreign currency translation.

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