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Components of Accumulated Other Comprehensive Loss (Changes in Accumulated Other Comprehensive Loss) (Details) $ in Thousands | 6 Months Ended
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Jun. 30, 2019 USD ($)
Accumulated Other Comprehensive Income Loss [Line Items] |
Balance at beginning of period | $ (1,314,779)
Amounts arising during the period | 19,192
Amounts reclassified from AOCL to earnings | (2,436)
Net change | 16,756
Balance at end of period | (1,246,050)
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 | 19,192
Amounts reclassified from AOCL to earnings | (262)
Net change | 18,930
Balance at end of period | 20,490
Accumulated Other Comprehensive Loss [Member] |
Accumulated Other Comprehensive Income Loss [Line Items] |
Balance at beginning of period | 129,431
Balance at end of period | 146,187
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 | (4,994)
Net change | (4,994)
Balance at end of period | 123,855
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 | (78)
Net change | (78)
Balance at end of period | 326
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 | (374)
Net change | (374)
Balance at end of period | 6,895
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 | 3,272
Net change | 3,272
Balance at end of period | $ (5,379)

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