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Components of Accumulated Other Comprehensive Loss | 3 Months Ended
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Mar. 31, 2021
Equity [Abstract] |
Components of Accumulated Other Comprehensive Loss | NOTE 12. COMPONENTS OF 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 March 31, |
(in thousands) |  | 2021 |  |  | 2020 |
Pension Plans |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | 79,025 |  |  | $ | 117,028 |
Amounts arising during the period |  |  | — |  |  |  | 19,402 |
Effect of pension settlement |  |  | — |  |  |  | (31,811 | )
Amounts reclassified from AOCL to earnings |  |  | (2,770 | ) |  |  | (3,095 | )
Balance at end of period |  | $ | 76,255 |  |  | $ | 101,524 |
Other Postretirement Benefit Plans |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | 14,783 |  |  | $ | 10,331 |
Amounts reclassified from AOCL to earnings |  |  | (183 | ) |  |  | (74 | )
Balance at end of period |  | $ | 14,600 |  |  | $ | 10,257 |
Cash Flow Hedges |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | 27,181 |  |  | $ | 20,000 |
Amounts arising during the period |  |  | (61,875 | ) |  |  | 39,363 |
Amounts reclassified from AOCL to earnings |  |  | (2,232 | ) |  |  | (838 | )
Balance at end of period |  | $ | (36,926 | ) |  | $ | 58,525 |
Accumulated other comprehensive loss, end of period |  | $ | 53,929 |  |  | $ | 170,306 |
See Note 11: Pension and Other Postretirement Employee Benefits and Note 6: Derivative Instruments for additional information.

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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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