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OTHER COMPREHENSIVE INCOME (Changes in Accumulated Other Comprehensive Income, Net of Tax) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]        
AOCI, Beginning balance     $ (181,305)  
Amounts reclassified from AOCI     3,186  
Net current period OCI changes $ 1,595 $ 1,889 3,186 $ (10,301)
AOCI, Ending balance (178,119) $ (208,039) (178,119) $ (208,039)
Amortization of Interest Rate Hedges Losses [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
AOCI, Beginning balance     (23,943)  
Amounts reclassified from AOCI     716  
Net current period OCI changes     716  
AOCI, Ending balance (23,227)   (23,227)  
Amortization of Pension and Postretirement Plan Actuarial Loss and Prior Service Cost [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
AOCI, Beginning balance     (157,362)  
Amounts reclassified from AOCI     2,470  
Net current period OCI changes     2,470  
AOCI, Ending balance $ (154,892)   $ (154,892)