Intangible Assets - Net Carrying Value and Accumulated Amortization of Major Classes of Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 55,718	$ 55,916
Accumulated Amortization	(31,906)	(30,675)
Net Carrying Amount	23,812	25,241
Licenses
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	11,256	11,454
Accumulated Amortization	(7,342)	(7,280)
Net Carrying Amount	3,914	4,174
Technology acquired in acquisitions
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	8,613	8,613
Accumulated Amortization	(8,613)	(8,613)
Net Carrying Amount	0	0
Customer relationships and other intangible assets acquired in acquisitions
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	35,849	35,849
Accumulated Amortization	(15,951)	(14,782)
Net Carrying Amount	$ 19,898	$ 21,067