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Components of Accumulated Other Comprehensive Loss (Changes in Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Accumulated Other Comprehensive Income Loss [Line Items] |  |
Balance at beginning of period | $ (1,526,133) | $ (1,304,953)
Effect of pension settlement | (10,553) | 0
Balance at end of period | (1,712,198) | (1,477,549)
Pension Plans [Member] |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |
Balance at beginning of period | 49,579 | 79,025
Net (gain) loss arising during the period | 4,587 |
Effect of pension settlement | (10,553) |
Amounts reclassified from AOCI to earnings | (1,469) | (2,770)
Balance at end of period | 42,144 | 76,255
Other Postretirement Benefit Plans [Member] |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |
Balance at beginning of period | 1,790 | 14,783
Amounts reclassified from AOCI to earnings | (45) | (183)
Balance at end of period | 1,745 | 14,600
Cash Flow Hedges [Member] |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |
Balance at beginning of period | (8,131) | 27,181
Net (gain) loss arising during the period | (41,243) | (61,875)
Amounts reclassified from AOCI to earnings | (2,033) | (2,232)
Balance at end of period | (51,407) | (36,926)
Accumulated Other Comprehensive Loss [Member] |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |
Balance at beginning of period | 43,238 | 120,989
Balance at end of period | $ (7,518) | $ 53,929

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