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, 2017
Dec. 31, 2016
Offsetting Derivative Liabilities [Abstract]    
Gross amounts of recognized liabilities $ 290,845 $ 370,647
Gross amounts offset in the condensed consolidated balance sheets (212,487) (272,361)
Derivative liabilities 78,358 98,286
Gross amounts not offset in the condensed consolidated balance sheets, Financial instruments 0 (7,550)
Gross amounts not offset in the condensed consolidated balance sheets, Cash collateral received (24,348) (23,943)
Net amount $ 54,010 $ 66,793