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