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OTHER COMPREHENSIVE INCOME (Changes in Accumulated Other Comprehensive Income, Net of Tax) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]    
AOCI, Beginning balance $ (197,738)  
Other comprehensive income (loss) before reclassifications (14,680)  
Amounts reclassified from AOCI 2,489  
Net OCI changes (12,191) $ 290
AOCI, Ending balance (209,929) $ (171,925)
Interest Rate Hedge Losses [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
AOCI, Beginning balance (10,953)  
Other comprehensive income (loss) before reclassifications (14,680)  
Amounts reclassified from AOCI 794  
Net OCI changes (13,886)  
AOCI, Ending balance (24,839)  
Pension and Postretirement Plan Actuarial Loss and Prior Service Cost [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
AOCI, Beginning balance (186,785)  
Other comprehensive income (loss) before reclassifications 0  
Amounts reclassified from AOCI 1,695  
Net OCI changes 1,695  
AOCI, Ending balance $ (185,090)