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Components of Accumulated Other Comprehensive Loss (Changes in Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income Loss [Line Items]    
Balance at beginning of period $ (1,314,779) $ (200,542)
Net loss (gain) arising during the period 23,660 18,776
Amounts reclassified from AOCL to earnings (5,732) (7,461)
Amounts reclassified from AOCL to accumulated deficit [1]   23,265
Balance at end of period (1,226,831) (1,314,779)
Gains and losses on cash flow hedges [Member]    
Accumulated Other Comprehensive Income Loss [Line Items]    
Balance at beginning of period 1,560 (705)
Net loss (gain) arising during the period 19,824 3,062
Amounts reclassified from AOCL to earnings (1,384) (647)
Amounts reclassified from AOCL to accumulated deficit [1]   (150)
Balance at end of period 20,000 1,560
Prior Service Cost [Member] | Pension Plans [Member]    
Accumulated Other Comprehensive Income Loss [Line Items]    
Balance at beginning of period 404 446
Amounts reclassified from AOCL to earnings (156) (137)
Amounts reclassified from AOCL to accumulated deficit [1]   95
Balance at end of period 248 404
Prior Service Cost [Member] | OPEB [Member]    
Accumulated Other Comprehensive Income Loss [Line Items]    
Balance at beginning of period (8,651) (12,546)
Amounts reclassified from AOCL to earnings 6,545 6,569
Amounts reclassified from AOCL to accumulated deficit [1]   (2,674)
Balance at end of period (2,106) (8,651)
Actuarial Loss [Member] | Pension Plans [Member]    
Accumulated Other Comprehensive Income Loss [Line Items]    
Balance at beginning of period 128,849 100,165
Net loss (gain) arising during the period (2,081) 17,268
Amounts reclassified from AOCL to earnings (9,988) (12,276)
Amounts reclassified from AOCL to accumulated deficit [1]   23,692
Balance at end of period 116,780 128,849
Actuarial Loss [Member] | OPEB [Member]    
Accumulated Other Comprehensive Income Loss [Line Items]    
Balance at beginning of period 7,269 7,491
Net loss (gain) arising during the period 5,917 (1,554)
Amounts reclassified from AOCL to earnings (749) (970)
Amounts reclassified from AOCL to accumulated deficit [1]   2,302
Balance at end of period 12,437 7,269
AOCI Attributable to Parent [Member]    
Accumulated Other Comprehensive Income Loss [Line Items]    
Balance at beginning of period 129,431 94,851
Balance at end of period $ 147,359 $ 129,431
[1] Reclassifications between AOCL and accumulated deficit during 2018 relate to certain tax effects of tax law changes on pension and other postretirement employee benefits and a cash flow hedge upon adoption of ASU 2018-02 during 2018.