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Changes in Accumulated Other Comprehensive Loss by Component - Reclassifications (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Amounts reclassified from accumulated other comprehensive loss: |  |
Interest expense, net | $ 5,040 | $ 4,150
Tax expense (benefit) | (3,262) | (463)
Reclassification net of tax | 10,086 | 297
Interest rate swap | Amount reclassified from accumulated other comprehensive income |  |
Amounts reclassified from accumulated other comprehensive loss: |  |
Interest expense, net |  | 49
Tax expense (benefit) |  | (13)
Reclassification net of tax |  | 36
Other Postretirement Benefit Liability | Amount reclassified from accumulated other comprehensive income |  |
Amounts reclassified from accumulated other comprehensive loss: |  |
Actuarial (gains) losses | (77) | (78)
Tax expense (benefit) | 20 | 20
Reclassification net of tax | (57) | (58)
Pension Liability | Amount reclassified from accumulated other comprehensive income |  |
Amounts reclassified from accumulated other comprehensive loss: |  |
Actuarial (gains) losses |  | 149
Tax expense (benefit) |  | (39)
Reclassification net of tax |  | $ 110
Unrealized Net Loss on Interest Rate Swap | Interest rate swap |  |
Amounts reclassified from accumulated other comprehensive loss: |  |
Interest expense, net | 359 |
Tax expense (benefit) | (93) |
Reclassification net of tax | $ 266 |

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