Derivative Instruments - (Details 2) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Offsetting Derivative Assets
Gross amounts recognized	$ 12	$ 446
Gross amounts offset in the Consolidated Balance Sheets	0	0
Net amounts presented in the Consolidated Balance Sheets	12	446
Financial instruments	12	282
Financial collateral pledged	0	0
Net amounts	0	164
Offsetting Derivative Liabilities
Gross amounts recognized	12,004	6,454
Gross amounts offset in the Consolidated Balance Sheets	0	0
Net amounts presented in the Consolidated Balance Sheets	12,004	6,454
Financial instruments	12	282
Financial collateral pledged	10,922	6,020
Net amounts	$ 1,070	$ 152

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