Commitments And Contingencies Commitments-Narrative (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Oct. 31, 2009	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Letters of credit outstanding		$ 2,400
Length of operating lease agreement	5 years
Operating Leases, Future Minimum Payments Due		14,218
Operating leases, rent expense		3,400	$ 2,700	$ 2,700
Unrecorded unconditional purchase obligation		$ 16,600