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Fair Value Measurements (Details Textuals) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Derivative Asset $ 10,100 $ 2,200
Cash Equivalents 17,300 14,200
Change in Carrying Value Verse Fair Value of Long Term Debt 6,900 17,800
Fair Value, Measurements, Recurring [Member]    
Liabilities at Fair Value $ 6,528 $ 5,567