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Components of Accumulated Other Comprehensive Loss (Tables) | 12 Months Ended
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Dec. 31, 2020
Equity [Abstract] |
Changes in Accumulated Other Comprehensive Loss | The following tables detail the changes in our Accumulated Other Comprehensive Loss (AOCL) on our Consolidated Balance Sheets for the years ended December 31, 2020 and 2019, net of tax.
(in thousands) |  | 2020 |  |  | 2019 |
Pension Plans |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | 117,028 |  |  | $ | 129,253 |
Net loss (gain) arising during the period |  |  | 5,306 |  |  |  | (2,081 | )
Effect of pension settlement |  |  | (31,811 | ) |  |  | — |
Amounts reclassified from AOCL to earnings |  |  | (11,498 | ) |  |  | (10,144 | )
Balance at end of period |  |  | 79,025 |  |  |  | 117,028 |
Other Postretirement Benefit Plans |  |  |  |  |  |  |  |
Balance at beginning of period |  |  | 10,331 |  |  |  | (1,382 | )
Net loss arising during the period |  |  | 4,747 |  |  |  | 5,917 |
Amounts reclassified from AOCL to earnings |  |  | (295 | ) |  |  | 5,796 |
Balance at end of period |  |  | 14,783 |  |  |  | 10,331 |
Cash Flow Hedges |  |  |  |  |  |  |  |
Balance at beginning of period |  |  | 20,000 |  |  |  | 1,560 |
Net loss arising during the period |  |  | 14,632 |  |  |  | 19,824 |
Amounts reclassified from AOCL to earnings |  |  | (7,451 | ) |  |  | (1,384 | )
Balance at end of period |  |  | 27,181 |  |  |  | 20,000 |
Accumulated other comprehensive loss, end of period |  | $ | 120,989 |  |  | $ | 147,359 |

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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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