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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, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Amounts reclassified from accumulated other comprehensive loss: |  |  |  |
Interest expense, net | $ 5,662 | $ 4,189 | $ 10,702 | $ 8,339
Tax expense (benefit) | (17,456) | 8,299 | (20,718) | 7,836
Reclassification net of tax | $ 103,859 | $ (25,154) | 113,945 | (24,849)
Interest rate swap | Amount reclassified from accumulated other comprehensive income |  |  |  |
Amounts reclassified from accumulated other comprehensive loss: |  |  |  |
Interest expense, net |  |  |  | 95
Tax expense (benefit) |  |  |  | (25)
Reclassification net of tax |  |  |  | 70
Other Postretirement Benefit Liability | Amount reclassified from accumulated other comprehensive income |  |  |  |
Amounts reclassified from accumulated other comprehensive loss: |  |  |  |
Actuarial (gains) losses |  |  | (154) | (156)
Tax expense (benefit) |  |  | 40 | 41
Reclassification net of tax |  |  | (114) | (115)
Pension Liability | Amount reclassified from accumulated other comprehensive income |  |  |  |
Amounts reclassified from accumulated other comprehensive loss: |  |  |  |
Actuarial (gains) losses |  |  |  | 298
Tax expense (benefit) |  |  |  | (78)
Reclassification net of tax |  |  |  | $ 220
Unrealized Net Loss on Interest Rate Swap | Interest rate swap |  |  |  |
Amounts reclassified from accumulated other comprehensive loss: |  |  |  |
Interest expense, net |  |  | 1,235 |
Tax expense (benefit) |  |  | (321) |
Reclassification net of tax |  |  | $ 914 |

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