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Fair Value Measurements - Effect of Interest Rate Swap (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Derivative [Line Items] |  |  |  |
Interest expense | $ 3,578 | $ 6,873 | $ 9,175 | $ 17,036
Derivative payments on interest rate swap | 0 | 0 | 1,717 | 0
Loss on interest rate swap (2) | 0 | 0 | 2,033 | 0
Interest Rate Swap |  |  |  |
Derivative [Line Items] |  |  |  |
Interest expense | $ 29 | $ 4,100 | $ 29 | $ 8,906

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