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RETIREMENT PLANS (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Defined Benefit Plan Disclosure [Line Items]        
Pension plan defined benefit plan cost increase limit percentage     4.00%  
Pension Benefits [Member]        
Components of net periodic benefit cost [Abstract]        
Service cost $ 3,482,000 $ 3,517,000 $ 6,702,000 $ 7,347,000
Interest cost 3,651,000 3,302,000 7,063,000 6,656,000
Expected return on plan assets (4,251,000) (4,485,000) (8,404,000) (8,968,000)
Amortization of actuarial (gain) loss 1,525,000 1,903,000 2,743,000 3,867,000
Net periodic benefit cost 4,407,000 4,237,000 8,104,000 8,902,000
Pension Benefits [Member] | Minimum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan of asset contributions to pension plan obligations 20,000,000   20,000,000  
Pension Benefits [Member] | Maximum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan of asset contributions to pension plan obligations 30,000,000   30,000,000  
SERP [Member]        
Components of net periodic benefit cost [Abstract]        
Service cost 0 0 0 0
Interest cost 17,000 16,000 33,000 32,000
Expected return on plan assets 0 0 0 0
Amortization of actuarial (gain) loss 6,000 7,000 13,000 14,000
Net periodic benefit cost 23,000 23,000 46,000 46,000
Other Postretirement Benefits [Member]        
Components of net periodic benefit cost [Abstract]        
Service cost 0 0 0 0
Interest cost 3,000 5,000 15,000 18,000
Amortization of actuarial (gain) loss (186,000) (222,000) (374,000) (395,000)
Net periodic benefit cost $ (183,000) $ (217,000) $ (359,000) $ (377,000)