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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Benefit Obligation, Period Increase (Decrease) | $ (6,000) |  |
Gain on curtailment of pension obligation | 2,032 | $ 0 |
Other post-retirement benefits income (loss), net of tax | $ 3,996 | $ 0 |
Weighted average discount rate | 23.00% |  |
Rate of compensation increase | 3.00% |  |
Weighted Average |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Weighted average discount rate | 3.25% |  | 2.65%

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