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Summary of Significant Accounting Policies (Details 4) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Changes in accumulated other comprehensive income, net of tax      
Balance at the beginning of period $ 5,739us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax    
Other comprehensive loss (4,463)us-gaap_OtherComprehensiveIncomeLossNetOfTax 719us-gaap_OtherComprehensiveIncomeLossNetOfTax 243us-gaap_OtherComprehensiveIncomeLossNetOfTax
Balance at the end of period 1,276us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 5,739us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax  
Foreign currency      
Changes in accumulated other comprehensive income, net of tax      
Balance at the beginning of period 6,070us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember
   
Other comprehensive loss (4,150)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember
   
Balance at the end of period 1,920us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedTranslationAdjustmentMember
   
Defined benefit pension plan      
Changes in accumulated other comprehensive income, net of tax      
Balance at the beginning of period (331)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
   
Other comprehensive loss (313)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember
   
Balance at the end of period $ (644)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember