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OTHER COMPREHENSIVE INCOME (Changes in Accumulated Other Comprehensive Income, Net of Tax) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]      
AOCI, Beginning balance $ (172,215) $ (149,466) $ (139,376)
Other comprehensive income (loss) before reclassifications (26,892) 2,289 (14,106)
Released stranded tax effects ASU 2018-02 (Note 9)   (29,629)  
Amounts reclassified from AOCI 1,369 4,591 4,016
Net OCI changes (25,523) 6,880 (10,090)
Balances at January 1, 2018, due to reclassification   (179,095)  
AOCI, Ending balance (197,738) (172,215) (149,466)
Reclassification Adjustment for Cash Flow Hedges [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
AOCI, Beginning balance (11,180) (11,438) (13,300)
Other comprehensive income (loss) before reclassifications 0 2,496 0
Released stranded tax effects ASU 2018-02 (Note 9)   (2,464)  
Amounts reclassified from AOCI 227 226 1,862
Net OCI changes 227 2,722 1,862
Balances at January 1, 2018, due to reclassification   (13,902)  
AOCI, Ending balance (10,953) (11,180) (11,438)
Amortization of Pension and Postretirement Plan Actuarial Loss and Prior Service Cost [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
AOCI, Beginning balance (161,035) (138,028) (126,076)
Other comprehensive income (loss) before reclassifications (26,892) (207) (14,106)
Released stranded tax effects ASU 2018-02 (Note 9)   (27,165)  
Amounts reclassified from AOCI 1,142 4,365 2,154
Net OCI changes (25,750) 4,158 (11,952)
Balances at January 1, 2018, due to reclassification   (165,193)  
AOCI, Ending balance $ (186,785) $ (161,035) $ (138,028)