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Employee Retirement Plans - Expected Benefit Payments (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Expected benefit payments |  |  |
Voluntary contribution |  |  | $ 7,000
Conjunction with the termination | $ 464 |  |
Pension cost |  |  |
Expected benefit payments |  |  |
Pension funding contributions made |  | $ 460 |
Pension cost | Minimum |  |  |
Expected benefit payments |  |  |
Pension funding contributions made |  | $ 0 |

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