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Summary of Significant Accounting Policies - Research and Development (Details 6) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Research and development expenses [Member]      
Research and Development      
Reimbursements received from customers $ 1,400us-gaap_ReimbursementRevenue
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
$ 2,087us-gaap_ReimbursementRevenue
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
$ 3,186us-gaap_ReimbursementRevenue
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
Other Current Assets [Member]      
Research and Development      
Cost of molds, dies and other tools included in Other current assets $ 2,991us-gaap_PreproductionCostsRelatedToLongTermSupplyArrangementsAssetForMoldsDiesAndToolsOwned
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentAssetsMember
$ 3,059us-gaap_PreproductionCostsRelatedToLongTermSupplyArrangementsAssetForMoldsDiesAndToolsOwned
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherCurrentAssetsMember