Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE FINANCIAL INSTRUMENTS - Offsetting Liabilities (Details)

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DERIVATIVE FINANCIAL INSTRUMENTS - Offsetting Liabilities (Details) - Derivative Contract - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Offsetting Derivative Liabilities [Abstract]    
Gross amounts of recognized liabilities $ 325,859 $ 288,659
Gross amounts offset in the condensed consolidated balance sheets (239,910) (144,309)
Derivative liabilities 85,949 144,350
Gross amounts not offset in the condensed consolidated balance sheets, Financial instruments (57,320) (62,460)
Gross amounts not offset in the condensed consolidated balance sheets, Cash collateral received (4,885) (20)
Net amount $ 23,744 $ 81,870