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Components of Accumulated Other Comprehensive Loss (Tables) | 3 Months Ended
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Mar. 31, 2020
Equity [Abstract] |
Changes in Accumulated Other Comprehensive Loss | During 2020, changes in amounts included in our accumulated other comprehensive loss (AOCL) by component on our Condensed Consolidated Balance Sheets, net of tax, are:
|  | Three Months Ended March 31, |
(in thousands) |  | 2020 |  |  | 2019 |
Pension Plans |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | 117,028 |  |  | $ | 129,253 |
Net loss arising during the period |  |  | 19,402 |  |  |  | — |
Effect of pension settlement |  |  | (31,811 | ) |  |  | — |
Amounts reclassified from AOCL to earnings |  |  | (3,095 | ) |  |  | (2,575 | )
Balance at end of period |  | $ | 101,524 |  |  | $ | 126,678 |
Other Postretirement Benefit Plans |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | 10,331 |  |  | $ | (1,382 | )
Amounts reclassified from AOCL to earnings |  |  | (74 | ) |  |  | 1,409 |
Balance at end of period |  | $ | 10,257 |  |  | $ | 27 |
Cash Flow Hedges |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | 20,000 |  |  | $ | 1,560 |
Net loss arising during the period |  |  | 39,363 |  |  |  | 8,594 |
Amounts reclassified from AOCL to earnings |  |  | (838 | ) |  |  | (81 | )
Balance at end of period |  | $ | 58,525 |  |  | $ | 10,073 |
Accumulated other comprehensive loss, end of period |  | $ | 170,306 |  |  | $ | 136,778 |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: 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=118930883&loc=SL7669686-108580 + Details
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