Derivative Instruments (Textual) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Derivative Instruments [Abstract]
Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months 2	$ 7,650
Derivative Cash Received On Hedge	$ 108,347	$ 106,360