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Fair Value Measurements (Details Textuals) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Derivative Asset $ 5,300 $ 8,200
Cash Equivalents 19,700 18,800
Change in Carrying Value Verse Fair Value of Long Term Debt 31,600 9,200
Fair Value, Measurements, Recurring [Member]    
Liabilities at Fair Value $ 12,033 $ 4,717