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Summary of Offsetting Assets and Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Derivative instruments (assets)    
Gross fair value of recognized assets $ 138,520 $ 119,862
Financial instruments (70,194) (26,254)
Cash collateral received (65,290) (92,756)
Net fair value 3,036 852
Derivatives instrument (liabilities)    
Gross fair value of recognized liabilities 35,943 26,254
Financial instruments (35,694) (26,254)
Cash collateral received 0 0
Net fair value 249 $ 0
Derivative instruments    
Derivative instruments (assets)    
Gross fair value of recognized assets 104,020  
Financial instruments (35,694)  
Cash collateral received (65,290)  
Net fair value 3,036  
Short-term reverse purchase agreement    
Derivative instruments (assets)    
Gross fair value of recognized assets 34,500  
Financial instruments (34,500)  
Cash collateral received 0  
Net fair value $ 0