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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]      
AOCI, Beginning balance $ (149,466) $ (139,376) $ (120,069)
Other comprehensive income (loss) before reclassifications 2,289 (14,106) (20,583)
Released stranded tax effects ASU 2018-02 (Note 9)   (29,629)  
Amounts reclassified from AOCI 4,591 4,016 1,276
Other comprehensive income (loss) 6,880 (10,090) (19,307)
Balances at January 1, 2018, due to reclassification   (179,095)  
AOCI, Ending balance (172,215) (149,466) (139,376)
Interest Rate Hedge Losses [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
AOCI, Beginning balance (11,438) (13,300) (14,494)
Other comprehensive income (loss) before reclassifications 2,496 0 0
Released stranded tax effects ASU 2018-02 (Note 9)   (2,464)  
Amounts reclassified from AOCI 226 1,862 1,194
Other comprehensive income (loss) 2,722 1,862 1,194
Balances at January 1, 2018, due to reclassification   (13,902)  
AOCI, Ending balance (11,180) (11,438) (13,300)
Pension and Postretirement Plan Actuarial Loss and Prior Service Cost [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
AOCI, Beginning balance (138,028) (126,076) (105,575)
Other comprehensive income (loss) before reclassifications (207) (14,106) (20,583)
Released stranded tax effects ASU 2018-02 (Note 9)   (27,165)  
Amounts reclassified from AOCI 4,365 2,154 82
Other comprehensive income (loss) 4,158 (11,952) (20,501)
Balances at January 1, 2018, due to reclassification   (165,193)  
AOCI, Ending balance $ (161,035) $ (138,028) $ (126,076)