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Product Warranty (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Activities in product warranty account [Abstract]    
Balance at December 31, 2014 $ 1,456us-gaap_StandardProductWarrantyAccrual  
Warranty provision 171us-gaap_StandardProductWarrantyAccrualWarrantiesIssued  
Warranty claims 109us-gaap_StandardProductWarrantyAccrualPayments  
Currency adjustment (11)us-gaap_StandardProductWarrantyAccrualCurrencyTranslationIncreaseDecrease  
Standard Product Warranty Accrual, Period Increase (Decrease), Total 51us-gaap_StandardProductWarrantyAccrualPeriodIncreaseDecrease (61)us-gaap_StandardProductWarrantyAccrualPeriodIncreaseDecrease
Balance at March 31, 2015 $ 1,507us-gaap_StandardProductWarrantyAccrual