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Benefit Plans - Unfunded Status (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Retirement Benefits [Abstract] |  |  |
Projected benefit obligation | $ 27,539 | $ 30,877 | $ 28,914
Fair value of plan assets | 20,254 | 23,461 | $ 21,345
Underfunded status | 7,285 | 7,416 |
Other post-retirement benefits income (loss) | 3,494 | $ 2,965 |
Expected amortization, next fiscal year | $ 100 |  |

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