SIGNIFICANT ACCOUNTING POLICIES - Purchased Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Purchased intangible assets
Weighted average amortization period	12 years
Gross	$ 71,170	$ 69,237
Accumulated Amortization	(34,712)	(27,279)
Net	36,458	41,958
Expected future amortization of intangible assets
2014	6,289
2015	4,776
2016	4,776
2017	4,751
2018	3,468
Thereafter	12,398
Net	36,458	41,958
Core technology
Purchased intangible assets
Weighted average amortization period	20 years
Gross	23,391	22,494
Accumulated Amortization	(7,155)	(5,749)
Net	16,236	16,745
Expected future amortization of intangible assets
Net	16,236	16,745
Customer relationships
Purchased intangible assets
Weighted average amortization period	9 years
Gross	45,269	44,334
Accumulated Amortization	(25,813)	(20,046)
Net	19,456	24,288
Expected future amortization of intangible assets
Net	19,456	24,288
Trademarks/ Trade names
Purchased intangible assets
Weighted average amortization period	9 years
Gross	2,510	2,409
Accumulated Amortization	(1,744)	(1,484)
Net	766	925
Expected future amortization of intangible assets
Net	$ 766	$ 925