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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset, Fair Value, Gross Asset $ 1,900 $ 800
Cash Equivalents, at Carrying Value 5,616 21,513
Change in Carrying Value Verse Fair Value of Long Term Debt $ 6,600 $ 4,200