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Components of Accumulated Other Comprehensive Loss (Tables) | 6 Months Ended
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Jun. 30, 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 June 30, |  |  | Six Months Ended June 30, |
(in thousands) |  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Pension Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | 101,524 |  |  | $ | 126,678 |  |  | $ | 117,028 |  |  | $ | 129,253 |
Net loss arising during the period |  |  | — |  |  |  | — |  |  |  | 19,402 |  |  |  | — |
Effect of pension settlement |  |  | — |  |  |  | — |  |  |  | (31,811 | ) |  |  | — |
Amounts reclassified from AOCL to earnings |  |  | (2,654 | ) |  |  | (2,497 | ) |  |  | (5,749 | ) |  |  | (5,072 | )
Balance at end of period |  | $ | 98,870 |  |  | $ | 124,181 |  |  | $ | 98,870 |  |  | $ | 124,181 |
Other Postretirement Benefit Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | 10,257 |  |  | $ | 27 |  |  | $ | 10,331 |  |  | $ | (1,382 | )
Amounts reclassified from AOCL to earnings |  |  | (73 | ) |  |  | 1,489 |  |  |  | (147 | ) |  |  | 2,898 |
Balance at end of period |  | $ | 10,184 |  |  | $ | 1,516 |  |  | $ | 10,184 |  |  | $ | 1,516 |
Cash Flow Hedges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | 58,525 |  |  | $ | 10,073 |  |  | $ | 20,000 |  |  | $ | 1,560 |
Net loss arising during the period |  |  | 3,669 |  |  |  | 10,598 |  |  |  | 43,032 |  |  |  | 19,192 |
Amounts reclassified from AOCL to earnings |  |  | (1,822 | ) |  |  | (181 | ) |  |  | (2,660 | ) |  |  | (262 | )
Balance at end of period |  | $ | 60,372 |  |  | $ | 20,490 |  |  | $ | 60,372 |  |  | $ | 20,490 |
Accumulated other comprehensive loss, end of period |  | $ | 169,426 |  |  | $ | 146,187 |  |  | $ | 169,426 |  |  | $ | 146,187 |

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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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