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Product Warranty (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Product Warranties Disclosures [Abstract]      
Product Warranty Accrual $ 1,714us-gaap_ProductWarrantyAccrual   $ 1,853us-gaap_ProductWarrantyAccrual
Summary of product warranty activity      
Beginning balance 1,853us-gaap_StandardProductWarrantyAccrual 1,269us-gaap_StandardProductWarrantyAccrual  
Charges to expense 57us-gaap_ProductWarrantyExpense 434us-gaap_ProductWarrantyExpense  
Costs incurred (196)us-gaap_StandardProductWarrantyAccrualPeriodIncreaseDecrease (336)us-gaap_StandardProductWarrantyAccrualPeriodIncreaseDecrease  
Ending balance $ 1,714us-gaap_StandardProductWarrantyAccrual $ 1,367us-gaap_StandardProductWarrantyAccrual