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Components of Accumulated Other Comprehensive Loss (Tables) | 6 Months Ended
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Jun. 30, 2021
Equity [Abstract] |
Changes in Accumulated Other Comprehensive Loss | The following table details changes in amounts included in our accumulated other comprehensive loss (AOCL) by component on our Condensed Consolidated Balance Sheets, net of tax:
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
(in thousands) |  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Pension Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | 76,255 |  |  | $ | 101,524 |  |  | $ | 79,025 |  |  | $ | 117,028 |
Amounts arising during the period |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 19,402 |
Effect of pension settlement |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (31,811 | )
Amounts reclassified from AOCL to earnings |  |  | (2,663 | ) |  |  | (2,654 | ) |  |  | (5,433 | ) |  |  | (5,749 | )
Balance at end of period |  | $ | 73,592 |  |  | $ | 98,870 |  |  | $ | 73,592 |  |  | $ | 98,870 |
Other Postretirement Benefit Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | 14,600 |  |  | $ | 10,257 |  |  | $ | 14,783 |  |  | $ | 10,331 |
Amounts reclassified from AOCL to earnings |  |  | (182 | ) |  |  | (73 | ) |  |  | (365 | ) |  |  | (147 | )
Balance at end of period |  | $ | 14,418 |  |  | $ | 10,184 |  |  | $ | 14,418 |  |  | $ | 10,184 |
Cash Flow Hedges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | (36,926 | ) |  | $ | 58,525 |  |  | $ | 27,181 |  |  | $ | 20,000 |
Amounts arising during the period |  |  | 33,444 |  |  |  | 3,669 |  |  |  | (28,431 | ) |  |  | 43,032 |
Amounts reclassified from AOCL to earnings |  |  | (2,281 | ) |  |  | (1,822 | ) |  |  | (4,513 | ) |  |  | (2,660 | )
Balance at end of period |  | $ | (5,763 | ) |  | $ | 60,372 |  |  | $ | (5,763 | ) |  | $ | 60,372 |
Accumulated other comprehensive loss, end of period |  | $ | 82,247 |  |  | $ | 169,426 |  |  | $ | 82,247 |  |  | $ | 169,426 |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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