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Financial Instruments - Interest Rate Swaps - Additional Information (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) swap | Dec. 31, 2019 USD ($)
Interest rate swaps |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value hedging instruments | $ 0 | $ 0
Number of interest rate swaps terminated | swap | 1 |
Number of interest rate swaps outstanding | swap | 4 |
Interest rate swap, April 2025 expiration |  |
Debt Securities, Available-for-sale [Line Items] |  |
Interest rate swap, term of contract | 5 years |
Notional amount | $ 50,000,000.0 |
Interest rate swap, fixed interest rate | 0.885% |
Interest rate swap, October 2020 expiration |  |
Debt Securities, Available-for-sale [Line Items] |  |
Notional amount | $ 25,000,000.0 |
Interest rate swap, February 2021 expiration |  |
Debt Securities, Available-for-sale [Line Items] |  |
Notional amount | $ 10,000,000 |
Interest rate swap, fixed interest rate | 1.12% |
Interest rate swap, May 2022 expiration |  |
Debt Securities, Available-for-sale [Line Items] |  |
Notional amount | $ 20,000,000 |
Interest rate swap, fixed interest rate | 1.77% |
Interest rate swap, June 2023 expiration |  |
Debt Securities, Available-for-sale [Line Items] |  |
Notional amount | $ 15,000,000 |
Interest rate swap, fixed interest rate | 2.64% |

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