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Summary of Offsetting Assets and Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Derivative instruments (assets)    
Gross fair value of recognized assets $ 423,415 $ 66,435
Financial instruments (335,579) (38,236)
Cash collateral received 78,757 19,060
Net fair value 9,079 9,139
Derivatives instrument (liabilities)    
Gross fair value of recognized liabilities 35,579 76,107
Financial instruments (35,579) (38,236)
Cash collateral received 0 (37,871)
Net fair value 0 $ 0
Derivative instruments    
Derivative instruments (assets)    
Gross fair value of recognized assets 123,415  
Financial instruments (35,579)  
Cash collateral received 78,757  
Net fair value 9,079  
Short-term reverse purchase agreement    
Derivative instruments (assets)    
Gross fair value of recognized assets 300,000  
Financial instruments (300,000)  
Cash collateral received 0  
Net fair value $ 0