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Intangible Assets and Deferred Charges - Narrative (Details) - USD ($) $ in Thousands |  | 3 Months Ended
--- | --- | ---
Jan. 15, 2021 | Mar. 31, 2021 | Mar. 31, 2020
Finite-Lived Intangible Assets [Line Items] |  |  |
Deferred charges, amortization period |  | 4 years |
Loss on extinguishment of debt |  | $ 223 | $ 0
Line of Credit | $150 million revolving line of credit, due January 15, 2025 | Revolving Credit Facility |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Debt term | 4 years |  |
Loss on extinguishment of debt |  | $ 200 |
Minimum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Estimated useful life |  | 8 years |
Maximum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Estimated useful life |  | 15 years |

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