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) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Derivative Liability [Abstract]    
Gross amounts offset in the consolidated balance sheets $ (144,309) $ (51,973)
Deriviative Contract    
Derivative Liability [Abstract]    
Gross amounts of recognized liabilities 288,659 363,192
Gross amounts offset in the consolidated balance sheets (144,309) (78,937)
Net amounts of assets presented in the consolidated balance sheets 144,350 284,255
Derivative Liability, Fair Value, Amount Not Offset Against Collateral [Abstract]    
Gross amounts not offset in the consolidated balance sheets, financial instruments (62,460) (78,654)
Gross amounts not offset in the consolidated balance sheets, cash collateral received (20) (111)
Net amount $ 81,870 $ 205,490