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Derivative Instruments - Additional information (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 USD ($) agreement | Mar. 31, 2021 agreement | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) agreement | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Derivative [Line Items] |  |  |  |  |  |
Interest expense | $ 16,987,000 |  | $ 16,089,000 | $ 32,006,000 | $ 31,785,000 |
Interest rate contract |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Borrowings at variable interest rates | $ 688,000,000.0 |  |  | $ 688,000,000.0 |  | $ 783,100,000
Number of interest rate swap agreements | agreement | 5 |  |  | 5 |  |
Number of interest rate swaps entered into | agreement |  | 4 |  |  |  |
Derivative, notional amount | $ 100,000,000.0 |  |  | $ 100,000,000.0 |  |
Net fair value of swap asset (liability) | 1,800,000 |  |  | 1,800,000 |  | $ (4,000,000.0)
Fair value of interest rate swap, asset | 3,900,000 |  |  | 3,900,000 |  |
Fair value of interest rate swap, liability | 2,100,000 |  |  | 2,100,000 |  |
Interest expense | $ 500,000 |  | $ 600,000 | $ 1,400,000 | $ 600,000 |
2021 Swap Agreements, Group 1 |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Number of interest rate swap agreements | agreement | 2 |  |  | 2 |  |
Remaining maturity term |  |  |  | 31 months |  |
2021 Swap Agreements, Group 2 |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Number of interest rate swap agreements | agreement | 2 |  |  | 2 |  |
Remaining maturity term |  |  |  | 55 months |  |
2019 Swap Ageement |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Number of interest rate swap agreements | agreement | 1 |  |  | 1 |  |
Derivative, notional amount | $ 100,000,000.0 |  |  | $ 100,000,000.0 |  |
Remaining maturity term |  |  |  | 36 months |  |
2016 Swap Agreement |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Number of interest rate swap agreements | agreement | 1 |  |  | 1 |  |

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