Commitments And Contingencies Commitments-Narrative (Details) - USD ($) $ in Thousands	1 Months Ended			12 Months Ended
	Oct. 31, 2013	Mar. 31, 2010	Oct. 31, 2009	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating Leased Assets [Line Items]
Term of lease renewal option				5 years
Letters of credit outstanding				$ 2,400
Length of operating lease agreement		3 years	5 years
Operating Leases, Future Minimum Payments Due				14,507
Operating leases, rent expense				2,700	$ 2,700	$ 2,800
Unrecorded unconditional purchase obligation				$ 13,900
Other Machinery and Equipment [Member]
Operating Leased Assets [Line Items]
Length of operating lease agreement	24 months