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Changes in Accumulated Other Comprehensive Loss by Component - Reclassifications (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Amounts reclassified from accumulated other comprehensive loss: |  |  |  |
Interest expense, net | $ 4,372 | $ 5,662 | $ 7,347 | $ 10,702
Tax expense (benefit) | 816 | (17,456) | 739 | (20,718)
Reclassification net of tax | $ (13,879) | $ 103,859 | (14,590) | 113,945
Interest rate swap | Amount reclassified from accumulated other comprehensive income |  |  |  |
Amounts reclassified from accumulated other comprehensive loss: |  |  |  |
Interest expense, net |  |  |  | 1,235
Tax expense (benefit) |  |  |  | (321)
Reclassification net of tax |  |  |  | 914
Other Postretirement Benefit Liability | Amount reclassified from accumulated other comprehensive income |  |  |  |
Amounts reclassified from accumulated other comprehensive loss: |  |  |  |
Actuarial (gains) losses |  |  | (156) | (154)
Tax expense (benefit) |  |  | 41 | 40
Reclassification net of tax |  |  | (115) | $ (114)
Unrealized Net Loss on Interest Rate Swap | Interest rate swap |  |  |  |
Amounts reclassified from accumulated other comprehensive loss: |  |  |  |
Interest expense, net |  |  | 2,108 |
Tax expense (benefit) |  |  | (548) |
Reclassification net of tax |  |  | $ 1,560 |

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