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BENEFIT PLANS (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Pension Benefits [Member]        
Net periodic benefit cost [Abstract]        
Service cost $ 1,027 $ 831 $ 2,052 $ 1,662
Interest cost 1,406 1,375 2,812 2,749
Expected return on plan assets (2,961) (3,042) (5,921) (6,085)
Amortization of unrecognized net loss 377 366 754 733
Amortization of prior service cost 11 2 22 4
Net periodic benefit cost (140) (468) (281) (937)
Post-retirement Benefits [Member]        
Net periodic benefit cost [Abstract]        
Service cost 0 0 0 0
Interest cost 20 22 41 43
Expected return on plan assets 0 0 0 0
Amortization of unrecognized net loss (1) (3) (3) (6)
Amortization of prior service cost (45) (45) (89) (89)
Net periodic benefit cost $ (26) $ (26) $ (51) $ (52)