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BENEFIT PLANS, Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Prior service costs [Abstract]      
Maximum percentage of net gain or loss over the greater of the projected benefit obligation or the market-related value of assets without requiring amortization 10.00%    
Pension Benefits [Member]      
Net periodic benefit cost [Abstract]      
Service cost $ 4,181 $ 4,106 $ 3,324
Interest cost 5,717 5,624 5,506
Expected return on plan assets (13,354) (11,842) (12,169)
Plan amendment 0 20 0
Amortization of unrecognized net loss/(gain) 767 1,508 1,466
Amortization of prior service cost 55 43 8
Net periodic (benefit) (2,634) (541) (1,865)
Post-retirement Benefits [Member]      
Net periodic benefit cost [Abstract]      
Service cost 0 0 0
Interest cost 76 82 87
Expected return on plan assets 0 0 0
Plan amendment 0 0 0
Amortization of unrecognized net loss/(gain) 8 (5) (13)
Amortization of prior service cost (179) (179) (179)
Net periodic (benefit) $ (95) $ (102) $ (105)