GOODWILL AND OTHER INTANGIBLE ASSETS - Summary of components of amortizing intangible assets (Details 1) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 75,874	$ 75,874
Accumulated Amortization	(54,532)	(48,988)
Acquired technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	43,627	43,627
Accumulated Amortization	(29,561)	(24,844)
Customer relationships and trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	32,247	32,247
Accumulated Amortization	$ (24,971)	$ (24,144)