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Summary of Significant Accounting Policies - Derivatives (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Aug. 31, 2021 | Dec. 31, 2020
Error Correction |  |  |  |  |  |  |
Accumulated other comprehensive loss | $ (2,930) |  |  | $ (2,930) |  |  | $ (1,587)
Interest expense | 3,289 |  | $ 5,929 | 13,549 | $ 19,810 |  |
Interest expense |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |
Interest expense |  |  |  | 638 |  |  |
Recurring |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |
Liability measured at fair value | 63 |  |  | 63 |  |  | 3,671
Level 2 | Recurring |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |
Liability measured at fair value | 63 |  |  | 63 |  |  | 3,671
Interest rate swap | Designated as Hedging Instrument | Cash Flow Hedging |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |
Notional amount |  |  |  |  |  | $ 230,000 |
Interest rate (as a percent) |  |  |  |  |  | 1.2757% |
Recorded amortized cost | 1,750 |  |  | 1,750 |  | $ 1,966 |
Fair value of embedded derivative liability | 63 |  |  | 63 |  |  |
Interest rate swap | Recurring |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |
Liability measured at fair value | 63 |  |  | 63 |  |  | 3,671
Interest rate swap | Level 2 | Recurring |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |
Liability measured at fair value | 63 |  |  | 63 |  |  | $ 3,671
Interest rate swap, first agreement | Designated as Hedging Instrument | Cash Flow Hedging |  |  |  |  |  |  |
Derivative |  |  |  |  |  |  |
Notional amount | $ 230,000 |  |  | $ 230,000 |  |  |
Interest rate (as a percent) | 2.1284% |  |  | 2.1284% |  |  |
Adjustment for the ineffective hedging of interest rate swap agreement. | Prior period error correction adjustment |  |  |  |  |  |  |
Error Correction |  |  |  |  |  |  |
Accumulated other comprehensive loss |  | $ 3,033 |  |  |  |  |
Interest expense |  | $ 3,033 |  |  |  |  |

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