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Financial Instruments - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Derivative [Line Items] |  |  |  |  |
Long-term debt | $ 326,286,000 |  | $ 326,286,000 |  | $ 375,397,000
Net loss recorded in accumulated other comprehensive income | (930,000) | $ (1,303,000) | (3,032,000) | $ 7,876,000 |
Interest Rate Swap |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Net loss recorded in accumulated other comprehensive income |  |  | 3,790,000 |  |
Secured Debt | Interest Rate Swap |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, notional amount | 275,000,000 |  | 275,000,000 |  |
Secured Debt | Term Loan Facility |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Long-term debt | $ 310,944,000 |  | $ 310,944,000 |  | $ 355,000,000

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