Annual report pursuant to Section 13 and 15(d)

BENEFIT PLANS - Amounts Recognized in AOCI (Details)

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BENEFIT PLANS - Amounts Recognized in AOCI (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract]        
Net actuarial loss $ (243,984) $ (240,197) $ (166,078)  
Prior service cost 13,237 14,517 9,855  
Defined benefit pension plans $ (230,747) $ (225,680) $ (156,223) $ (236,399)