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Commitments and Contingencies (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Accrued Warranty    
Warranty period of products purchased 1 year  
Balance as of the beginning of the year $ 5,662us-gaap_ProductWarrantyAccrual $ 4,942us-gaap_ProductWarrantyAccrual
Addition for new warranties issued 3,484us-gaap_ProductWarrantyAccrualWarrantiesIssued 5,291us-gaap_ProductWarrantyAccrualWarrantiesIssued
Addition from PSP acquisition 809us-gaap_ProductWarrantyAccrualAdditionsFromBusinessAcquisition  
Settlements (3,802)us-gaap_ProductWarrantyAccrualPayments (5,580)us-gaap_ProductWarrantyAccrualPayments
Changes in estimate (742)us-gaap_ProductWarrantyAccrualPreexistingIncreaseDecrease 1,009us-gaap_ProductWarrantyAccrualPreexistingIncreaseDecrease
Balance as of the end of the year $ 5,411us-gaap_ProductWarrantyAccrual $ 5,662us-gaap_ProductWarrantyAccrual