Annual report pursuant to Section 13 and 15(d)

DERIVATIVE FINANCIAL INSTRUMENTS - Offsetting Assets (Details)

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DERIVATIVE FINANCIAL INSTRUMENTS - Offsetting Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Derivative Asset [Abstract]    
Gross amounts offset in the consolidated balance sheets $ (161,297) $ (101,197)
Deriviative Contract    
Derivative Asset [Abstract]    
Gross amounts of recognized assets 436,169 480,803
Gross amounts offset in the consolidated balance sheets (161,297) (128,161)
Net amounts of assets presented in the consolidated balance sheets 274,872 352,642
Derivative Asset, Fair Value, Amount Not Offset Against Collateral [Abstract]    
Gross amounts not offset in the statement of financial position - financial instruments (39,305) (27,744)
Gross amounts not offset in the statement of financial position - cash collateral received (3,462) (1,095)
Net amount $ 232,105 $ 323,803