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, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Compensation and Retirement Disclosure [Abstract]        
Net actuarial loss $ (217,863) $ (243,984) $ (240,197)  
Prior service cost 11,958 13,237 14,517  
Defined benefit pension plans $ (205,905) $ (230,747) $ (225,680) $ (156,223)