Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments and Hedging Activities Credit Risk - Counterparty Exposure (Details)

v3.7.0.1
Derivative Instruments and Hedging Activities Credit Risk - Counterparty Exposure (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Offsetting Assets and Liabilities [Line Items]    
Derivative assets, at fair value $ 240,502 $ 324,182
Derivative liabilities, at fair value 2,580 $ 12,501
Collateral cash deposits received from counterparties (35)  
Collateral cash deposits placed in accounts maintained by counterparties $ 152,800