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Benefit Plans - Unfunded Status (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Retirement Benefits [Abstract] |  |  |
Projected benefit obligation | $ 52,142 | $ 27,539 | $ 30,877
Fair value of plan assets | 42,866 | 20,254 | $ 23,461
Underfunded status | 9,276 | 7,285 |
Other post-retirement benefits income (loss) | (2,622) | $ 3,494 |
Expected amortization, next fiscal year | $ 200 |  |

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