Fair Value Measurements (Details Textuals) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Derivative Assets	$ 6,300	$ 8,200
Derivative Liabilities	9,300	4,700
Cash Equivalents	17,100	18,800
Change in Carrying Value Verse Fair Value of Long Term Debt	12,600	9,200
Fair Value, Measurements, Recurring [Member]
Cash Equivalents	$ 17,142	$ 18,755