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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.

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