Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jul. 25, 2011
Loss Contingencies [Line Items]
Standard Product Warranty Accrual		$ 1,551	$ 2,024	$ 1,406
Product Warranty Accrual, Warranties Issued	2,048	1,956	2,482
Product Warranty Accrual, Additions from Business Acquisition	0	0	225
Product Warranty Expense	(2,025)	(2,429)	(2,089)
Product Warranty Accrual, Payments	1,574	1,551	2,024
Loss Contingency, Damages Awarded, Value	15,475
Additional Litigation accrual	9,622
Loss Contingency Accrual	13,865
Estimated Litigation Liability	3,252
Operating Leases, Rent Expense	3,716	3,794	3,134
Document Period End Date	Dec. 31, 2014
Operatingleases,equipment	95	171	123
Operating Leases, Future Minimum Payments Due	3,858
Operating Leases, Future Minimum Payments, Due in Two Years	2,700
Operating Leases, Future Minimum Payments, Due in Three Years	1,950
Operating Leases, Future Minimum Payments, Due in Four Years	1,779
Operating Leases, Future Minimum Payments, Due in Five Years	1,163
Operating Leases, Future Minimum Payments, Due Thereafter	472
Royalty Expense	819	831	1,165
Purchase Commitment, Remaining Minimum Amount Committed	11,781
Debt Instrument, Face Amount	60,000	60,000			60,000
Subsequent Event [Member]
Loss Contingencies [Line Items]
Loss Contingency, Damages Awarded, Value	$ 14,512