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Accumulated Other Comprehensive (Loss) Income - Components of Accumulated Other Comprehensive (loss) Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Changes in AOCI, Net |  |  |  |
Total accumulated other comprehensive (loss) income, beginning of period |  |  | $ (95,921) |
Total accumulated other comprehensive (loss) income, end of period | $ (4,842) |  | (4,842) |
Changes in Fair Market Value of Derivatives |  |  |  |
Changes in AOCI, Gross |  |  |  |
Gross, beginning of the period | (529) | $ (4,239) | (1,038) | $ 659
Gross, gain (loss) recognized in OCI | (128) | 525 | 568 | (4,647)
Gross, gain (loss) reclassified from AOCI to earnings | (251) | 656 | (438) | 930
Gross, ending balance | (908) | (3,058) | (908) | (3,058)
Changes in AOCI, Income tax benefit (expense) |  |  |  |
Income tax benefit (expense), beginning of period | 123 | 978 | 240 | (150)
Income tax benefit (expense), gain (loss) recognized in OCI | 29 | (122) | (131) | 1,059
Income tax benefit (expense), gain (loss) reclassified from AOCI to earnings | 58 | (150) | 101 | (203)
Income tax benefit (expense), ending of period | 210 | 706 | 210 | 706
Changes in AOCI, Net |  |  |  |
Total accumulated other comprehensive (loss) income, beginning of period | (406) | (3,261) | (798) | 509
Gain (loss) recognized in OCI, net | (99) | 403 | 437 | (3,588)
(Gain) Loss reclassified from AOCI to earnings, net | (193) | 506 | (337) | 727
Total accumulated other comprehensive (loss) income, end of period | (698) | (2,352) | (698) | (2,352)
Changes in Unrealized Pension Cost |  |  |  |
Changes in AOCI, Gross |  |  |  |
Gross, beginning of the period | (104,052) | (120,906) | (128,004) | (124,140)
Gross, gain (loss) recognized in OCI | (5,450) | 0 | (4,951) | 0
Gross, gain (loss) reclassified from AOCI to earnings | 106,622 | 1,606 | 130,075 | 4,840
Gross, ending balance | (2,880) | (119,300) | (2,880) | (119,300)
Changes in AOCI, Income tax benefit (expense) |  |  |  |
Income tax benefit (expense), beginning of period | 29,411 | 33,278 | 34,917 | 34,018
Income tax benefit (expense), gain (loss) recognized in OCI | 1,254 | 0 | 1,139 | 0
Income tax benefit (expense), gain (loss) reclassified from AOCI to earnings | (29,896) | (367) | (35,287) | (1,107)
Income tax benefit (expense), ending of period | 769 | 32,911 | 769 | 32,911
Changes in AOCI, Net |  |  |  |
Total accumulated other comprehensive (loss) income, beginning of period | (74,641) | (87,628) | (93,087) | (90,122)
Gain (loss) recognized in OCI, net | (4,196) | 0 | (3,812) | 0
(Gain) Loss reclassified from AOCI to earnings, net | 76,726 | 1,239 | 94,788 | 3,733
Total accumulated other comprehensive (loss) income, end of period | (2,111) | (86,389) | (2,111) | (86,389)
Cumulative Translation Adjustment |  |  |  |
Changes in AOCI, Gross |  |  |  |
Gross, beginning of the period | (2,023) | (2,266) | (2,036) | (2,211)
Gross, gain (loss) recognized in OCI | (10) | 99 | 3 | 44
Gross, gain (loss) reclassified from AOCI to earnings | 0 | 0 | 0 | 0
Gross, ending balance | (2,033) | (2,167) | (2,033) | (2,167)
Changes in AOCI, Income tax benefit (expense) |  |  |  |
Income tax benefit (expense), beginning of period |  |  |  | 98
Income tax benefit (expense), gain (loss) recognized in OCI |  |  |  | (98)
Income tax benefit (expense), gain (loss) reclassified from AOCI to earnings |  |  |  | 0
Income tax benefit (expense), ending of period |  | 0 |  | 0
Changes in AOCI, Net |  |  |  |
Total accumulated other comprehensive (loss) income, beginning of period |  |  |  | (2,113)
Gain (loss) recognized in OCI, net |  |  |  | (54)
(Gain) Loss reclassified from AOCI to earnings, net |  |  |  | 0
Total accumulated other comprehensive (loss) income, end of period |  | (2,167) |  | (2,167)
Accumulated Other Comprehensive Earnings/(Loss) |  |  |  |
Changes in AOCI, Net |  |  |  |
Total accumulated other comprehensive (loss) income, beginning of period | (77,070) | (93,155) | (95,921) | (91,726)
Gain (loss) recognized in OCI, net | (4,305) | 502 | (3,372) | (3,642)
(Gain) Loss reclassified from AOCI to earnings, net | 76,533 | 1,745 | 94,451 | 4,460
Total accumulated other comprehensive (loss) income, end of period | $ (4,842) | $ (90,908) | $ (4,842) | $ (90,908)

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