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Summary of Offsetting Assets and Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Derivative instruments (assets)    
Gross fair value of recognized assets $ 134,668 $ 66,435
Financial instruments (37,891) (38,236)
Cash collateral received 82,059 19,060
Net fair value 14,718 9,139
Derivatives instrument (liabilities)    
Gross fair value of recognized assets/liabilities 37,891 76,107
Financial Instruments (37,891) (38,236)
Cash collateral received/(pledged) 0 (37,871)
Net fair value $ 0 $ 0