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Comprehensive Income and Accumulated Other Comprehensive Income (Loss) - Summary of Effects of Reclassifications from Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Settlement gain |  |
Amortization of pension and other postretirement benefit plan items: |  |
Total before tax | $ (7) |
Pension and Other Postretirement Benefit Plans |  |
Amortization of pension and other postretirement benefit plan items: |  |
Total net of tax | (1,113) | $ (3,123)
Amount Reclassified from Accumulated Other Comprehensive Income | Actuarial losses |  |
Amortization of pension and other postretirement benefit plan items: |  |
Total before tax | 1,299 |
Amount Reclassified from Accumulated Other Comprehensive Income | Prior service cost |  |
Amortization of pension and other postretirement benefit plan items: |  |
Total before tax | 169 |
Amount Reclassified from Accumulated Other Comprehensive Income | Pension and Other Postretirement Benefit Plans |  |
Amortization of pension and other postretirement benefit plan items: |  |
Total before tax | 1,461 |
Tax benefit | (348) |
Total net of tax | $ 1,113 |

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