Debt - Schedule of Debt (Details)	3 Months Ended
	Mar. 31, 2022 USD ($) extension	Dec. 31, 2021 USD ($)
Debt Instrument [Line Items]
Net premium (discounts) and unamortized debt issuance costs	$ (11,447,000)	$ (12,210,000)
Unsecured Debt
Debt Instrument [Line Items]
Weighted average rate (percent)	3.22%
Net premium (discounts) and unamortized debt issuance costs	$ (11,447,000)	(12,210,000)
Amount outstanding, net	$ 1,669,553,000	1,877,790,000
Unsecured Debt | $500 Million Unsecured 2018 Line of Credit
Debt Instrument [Line Items]
Maximum extension period (in years)	1 year
Number of extension periods | extension	2
Extension period (in months)	6 months
Unsecured Debt | $500 Million Unsecured 2018 Line of Credit | Line of Credit
Debt Instrument [Line Items]
Face amount of debt instrument	$ 500,000,000
Effective interest rate (percent)	1.36%
Amount outstanding, gross	$ 81,000,000	290,000,000
Unsecured Debt | $500 Million Unsecured 2018 Line of Credit | Line of Credit | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	0.90%
Unsecured Debt | $350 Million Unsecured Senior Notes due 2023
Debt Instrument [Line Items]
Face amount of debt instrument	$ 350,000,000
Stated rate (percent)	3.40%
Effective interest rate (percent)	3.43%
Amount outstanding, gross	$ 350,000,000	350,000,000
Unsecured Debt | $400 Million Unsecured Senior Notes due 2024
Debt Instrument [Line Items]
Face amount of debt instrument	$ 400,000,000
Stated rate (percent)	4.45%
Effective interest rate (percent)	4.10%
Amount outstanding, gross	$ 400,000,000	400,000,000
Unsecured Debt | $250 Million Unsecured 2018 Term Loan
Debt Instrument [Line Items]
Face amount of debt instrument	$ 250,000,000
Effective interest rate (percent)	2.26%
Amount outstanding, gross	$ 250,000,000	250,000,000
Interest rate on derivative instrument	3.56%
Unsecured Debt | $250 Million Unsecured 2018 Term Loan | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	0.95%
Unsecured Debt | $300 Million Unsecured Senior Notes due 2030
Debt Instrument [Line Items]
Face amount of debt instrument	$ 300,000,000
Stated rate (percent)	3.15%
Effective interest rate (percent)	3.90%
Amount outstanding, gross	$ 300,000,000	300,000,000
Unsecured Debt | $300 Million Unsecured Senior Notes due 2032
Debt Instrument [Line Items]
Face amount of debt instrument	$ 300,000,000
Stated rate (percent)	2.75%
Effective interest rate (percent)	2.78%
Amount outstanding, gross	$ 300,000,000	$ 300,000,000
Interest rate swaps | $250 Million Unsecured 2018 Term Loan
Debt Instrument [Line Items]
Notional amount of interest rate swap agreements	$ 100,000,000