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Components of Accumulated Other Comprehensive Loss (Changes in Accumulated Other Comprehensive Loss) (Details) $ in Thousands | 9 Months Ended
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Sep. 30, 2019 USD ($)
Accumulated Other Comprehensive Income Loss [Line Items] |
Balance at beginning of period | $ (1,314,779)
Amounts arising during the period | 26,576
Amounts reclassified from AOCL to earnings | (3,929)
Net change | 22,647
Balance at end of period | (1,235,729)
Gains and losses on cash flow hedges [Member] |
Accumulated Other Comprehensive Income Loss [Line Items] |
Balance at beginning of period | 1,560
Amounts arising during the period | 26,576
Amounts reclassified from AOCL to earnings | (668)
Net change | 25,908
Balance at end of period | 27,468
Accumulated Other Comprehensive Loss [Member] |
Accumulated Other Comprehensive Income Loss [Line Items] |
Balance at beginning of period | 129,431
Balance at end of period | 152,078
Pension Plans [Member] | Actuarial Loss [Member] |
Accumulated Other Comprehensive Income Loss [Line Items] |
Balance at beginning of period | 128,849
Amounts reclassified from AOCL to earnings | (7,490)
Net change | (7,490)
Balance at end of period | 121,359
Pension Plans [Member] | Prior Service Cost [Member] |
Accumulated Other Comprehensive Income Loss [Line Items] |
Balance at beginning of period | 404
Amounts reclassified from AOCL to earnings | (117)
Net change | (117)
Balance at end of period | 287
OPEB [Member] | Actuarial Loss [Member] |
Accumulated Other Comprehensive Income Loss [Line Items] |
Balance at beginning of period | 7,269
Amounts reclassified from AOCL to earnings | (563)
Net change | (563)
Balance at end of period | 6,706
OPEB [Member] | Prior Service Cost [Member] |
Accumulated Other Comprehensive Income Loss [Line Items] |
Balance at beginning of period | (8,651)
Amounts reclassified from AOCL to earnings | 4,909
Net change | 4,909
Balance at end of period | $ (3,742)

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