Derivatives Fair Value Derivatives, Balance Sheet Location (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Foreign Currency Cash Flow Hedge Liability at Fair Value	$ 601
Cash Flow Hedge | Interest Rate Swap | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Foreign Currency Cash Flow Hedge Liability at Fair Value		$ 791
Cash Flow Hedge | Interest Rate Swap | Other Noncurrent Liabilities
Derivatives, Fair Value [Line Items]
Foreign Currency Cash Flow Hedge Liability at Fair Value		$ (23)
Cash Flow Hedge | Interest Rate Swap | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Foreign Currency Cash Flow Hedge Liability at Fair Value	751
Cash Flow Hedge | Interest Rate Swap | Designated as Hedging Instrument | Other Current Assets
Derivatives, Fair Value [Line Items]
Foreign Currency Cash Flow Hedge Liability at Fair Value	2
Cash Flow Hedge | Foreign currency hedges | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Foreign Currency Cash Flow Hedge Liability at Fair Value	$ 601