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Summary of Offsetting Assets and Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Derivative instruments (assets)    
Gross fair value of recognized assets $ 77,202 $ 66,435
Financial instruments (48,039) (38,236)
Cash collateral received 22,217 19,060
Net fair value 6,946 9,139
Derivatives instrument (liabilities)    
Gross fair value of recognized assets/liabilities 69,160 76,107
Financial Instruments (48,039) (38,236)
Cash collateral received/(pledged) (20,817) (37,871)
Net fair value $ 304 $ 0