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Employee Benefit Plans Stock Based Compensation (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Stock-based compensation expense $ 4,097us-gaap_ShareBasedCompensation $ 5,298us-gaap_ShareBasedCompensation $ 1,391us-gaap_ShareBasedCompensation
Cost of Sales [Member]      
Stock-based compensation expense 386us-gaap_ShareBasedCompensation
/ us-gaap_AmortizationExpensePerUnitOfProductionByCostCenterAxis
= us-gaap_OperatingExpenseMember		 550us-gaap_ShareBasedCompensation
/ us-gaap_AmortizationExpensePerUnitOfProductionByCostCenterAxis
= us-gaap_OperatingExpenseMember		 25us-gaap_ShareBasedCompensation
/ us-gaap_AmortizationExpensePerUnitOfProductionByCostCenterAxis
= us-gaap_OperatingExpenseMember
Research and Development Expense [Member]      
Stock-based compensation expense 818us-gaap_ShareBasedCompensation
/ us-gaap_AmortizationExpensePerUnitOfProductionByCostCenterAxis
= us-gaap_ResearchAndDevelopmentExpenseMember		 1,170us-gaap_ShareBasedCompensation
/ us-gaap_AmortizationExpensePerUnitOfProductionByCostCenterAxis
= us-gaap_ResearchAndDevelopmentExpenseMember		 601us-gaap_ShareBasedCompensation
/ us-gaap_AmortizationExpensePerUnitOfProductionByCostCenterAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
Selling, General and Administrative Expenses [Member]      
Stock-based compensation expense $ 2,893us-gaap_ShareBasedCompensation
/ us-gaap_AmortizationExpensePerUnitOfProductionByCostCenterAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember		 $ 3,578us-gaap_ShareBasedCompensation
/ us-gaap_AmortizationExpensePerUnitOfProductionByCostCenterAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember		 $ 765us-gaap_ShareBasedCompensation
/ us-gaap_AmortizationExpensePerUnitOfProductionByCostCenterAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember