Commitments and Contingencies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Aug. 08, 2014	Dec. 31, 2012	Jul. 25, 2011
Loss Contingencies [Line Items]
Standard Product Warranty Accrual		$ 1,574	$ 1,551		$ 2,024
Product Warranty Accrual, Warranties Issued	$ 2,640	2,048	1,956
Product Warranty Expense	(2,320)	(2,025)	(2,429)
Product Warranty Accrual, Payments	1,894	1,574	1,551
Loss Contingency, Damages Awarded, Value	14,512	15,475
Payments for Legal Settlements	0	10,613	0
Estimated Litigation Liability				$ 3,252
Loss Contingency Damages Awarded Value 2		14,600
Operating Leases, Rent Expense	$ 3,525	3,716	3,794
Document Period End Date	Dec. 31, 2015
Operatingleases,equipment	$ 105	95	171
Operating Leases, Future Minimum Payments Due	3,153
Operating Leases, Future Minimum Payments, Due in Two Years	2,558
Operating Leases, Future Minimum Payments, Due in Three Years	2,327
Operating Leases, Future Minimum Payments, Due in Four Years	1,692
Operating Leases, Future Minimum Payments, Due in Five Years	1,005
Operating Leases, Future Minimum Payments, Due Thereafter	1,310
Royalty Expense	813	819	$ 831
Purchase Commitment, Remaining Minimum Amount Committed	29,579
Debt Instrument, Face Amount	$ 60,000	$ 60,000				$ 60,000