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Financial Instruments - Narrative (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Derivative [Line Items] |  |  |
Long-term debt | $ 344,854,000 |  | $ 375,397,000
Fair value of contracts | 1,160,000 | $ (9,111,000) |
Interest Rate Swap |  |  |
Derivative [Line Items] |  |  |
Fair value of contracts | 5,662,000 |  |
Secured Debt | Interest Rate Swap |  |  |
Derivative [Line Items] |  |  |
Derivative, notional amount | 275,000,000 |  |
Secured Debt | Term Loan Facility |  |  |
Derivative [Line Items] |  |  |
Long-term debt | $ 324,500,000 |  | $ 355,000,000

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