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Derivative Instruments - Additional information (Details) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2021 USD ($) agreement	Mar. 31, 2021 agreement	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) agreement	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Derivative [Line Items]
Interest expense	$ 18,325		$ 15,351	$ 50,331	$ 47,136
Interest rate contract
Derivative [Line Items]
Borrowings at variable interest rates	$ 603,000			$ 603,000		$ 783,100
Number of interest rate swap agreements | agreement	5			5
Number of interest rate swaps entered into | agreement		4
Derivative, notional amount	$ 100,000			$ 100,000
Net fair value of swap asset (liability)	2,400			2,400		$ (4,000)
Fair value of interest rate swap, asset	4,200			4,200
Fair value of interest rate swap, liability	1,800			1,800
Interest expense	$ 500		$ 700	$ 1,900	$ 1,300
2021 Swap Agreements, Group 1
Derivative [Line Items]
Number of interest rate swap agreements | agreement	2			2
Remaining maturity term				28 months
2021 Swap Agreements, Group 2
Derivative [Line Items]
Number of interest rate swap agreements | agreement	2			2
Remaining maturity term				52 months
2019 Swap Ageement
Derivative [Line Items]
Number of interest rate swap agreements | agreement	1			1
Derivative, notional amount	$ 100,000			$ 100,000
Remaining maturity term				33 months
2016 Swap Agreement
Derivative [Line Items]
Number of interest rate swap agreements | agreement	1			1

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- Definition

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Fair value of the assets less the liabilities of a derivative or group of derivatives.

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