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Fair Value Measurements - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |  |  |
Interest expense - net | $ 470 | $ 3,761 | $ 4,911 | $ 6,134
Swap |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |  |  |
Derivative, notional amount | $ 50,000 | 50,000 |  |
Investment income |  | $ 289 | $ 114 | $ 34

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