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Components of Accumulated Other Comprehensive Loss (Tables) | 3 Months Ended
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Mar. 31, 2022
Equity [Abstract] |
Changes in Accumulated Other Comprehensive Loss | The following table details changes in amounts included in our Accumulated Other Comprehensive Income (Loss) (AOCI) by component on our Condensed Consolidated Balance Sheets, net of tax:
|  | Three Months Ended March 31, |
(in thousands) |  | 2022 |  |  | 2021 |
Pension Plans |  |  |  |  |  |
Balance at beginning of period |  | $ | 49,579 |  |  | $ | 79,025 |
Net 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 |  |  |  |  |  |
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 |  |  |  |  |  |
Balance at beginning of period |  |  | (8,131 | ) |  |  | 27,181 |
Amounts 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 (income) loss, end of period |  | $ | (7,518 | ) |  | $ | 53,929 |

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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=124509347&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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