Annual report pursuant to Section 13 and 15(d)

DERIVATIVE FINANCIAL INSTRUMENTS - Offsetting Liabilities (Details)

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DERIVATIVE FINANCIAL INSTRUMENTS - Offsetting Liabilities (Details) - Deriviative Contract - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Derivative Liability [Abstract]    
Gross amounts of recognized liabilities $ 370,647 $ 288,659
Gross amounts offset in the consolidated balance sheets (272,361) (144,309)
Net amounts of assets presented in the consolidated balance sheets 98,286 144,350
Derivative Liability, Fair Value, Amount Not Offset Against Collateral [Abstract]    
Gross amounts not offset in the consolidated balance sheets, financial instruments (7,550) (62,460)
Gross amounts not offset in the consolidated balance sheets, cash collateral received (23,943) (20)
Net amount $ 66,793 $ 81,870