Identifiable Intangible Assets - (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Finite-Lived Intangible Assets and Goodwill [Line Items]
Goodwill	$ 22,495		$ 22,495		$ 22,553
Goodwill, Acquired During Period			0
Business Acquisition Purchase Price Allocation Goodwill Amount 2			(58)
Finite-Lived Intangible Assets, Gross	73,752		73,752		73,752
Finite-Lived Intangible Assets, Accumulated Amortization	64,195		64,195		62,288
Intangible Assets, Net (Excluding Goodwill)	9,557		9,557		11,464
Amortization of Intangible Assets	567	666	1,907	1,930
Future Amortization Expense, Remainder of Fiscal Year	515		515
Future Amortization Expense, Year One	2,050		2,050
Future Amortization Expense, Year Two	1,941		1,941
Future Amortization Expense, Year Three	1,553		1,553
Future Amortization Expense, Year Four	1,117		1,117
Future Amortization Expense, Year Five	1,117		1,117
Developed Technology Rights [Member]
Finite-Lived Intangible Assets and Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross	59,831		59,831		59,831
Finite-Lived Intangible Assets, Accumulated Amortization	53,015		53,015		51,496
Intangible Assets, Net (Excluding Goodwill)	6,816		6,816		8,335
Customer Relationships [Member]
Finite-Lived Intangible Assets and Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross	9,560		9,560		9,560
Finite-Lived Intangible Assets, Accumulated Amortization	7,730		7,730		7,449
Intangible Assets, Net (Excluding Goodwill)	1,830		1,830		2,111
Trade Names [Member]
Finite-Lived Intangible Assets and Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross	4,361		4,361		4,361
Finite-Lived Intangible Assets, Accumulated Amortization	3,450		3,450		3,343
Intangible Assets, Net (Excluding Goodwill)	$ 911		$ 911		$ 1,018