Equity (Details) $ / shares in Units, $ in Thousands									3 Months Ended			9 Months Ended		12 Months Ended
	Nov. 02, 2022 $ / shares	Sep. 30, 2022 Vote $ / shares shares	Jul. 27, 2022 $ / shares	Jul. 01, 2022 $ / shares	May 04, 2022 $ / shares	Apr. 01, 2022 $ / shares	Feb. 16, 2022 $ / shares	Jan. 03, 2022 $ / shares	Sep. 30, 2022 Vote $ / shares shares	Mar. 31, 2022 USD ($) $ / shares shares	Sep. 30, 2021 $ / shares shares	Sep. 30, 2022 USD ($) Vote $ / shares shares	Sep. 30, 2021 USD ($) $ / shares shares	Dec. 31, 2021 $ / shares
Common stock
Proceeds from issuance of shares under public offering | $												$ 312,766	$ 342,618
Noncontrolling Interest
Preferred stock, par value (in dollars per share) | $ / shares		$ 0.01							$ 0.01			$ 0.01		$ 0.01
Distributions
Cash dividend declared (in dollars per share) | $ / shares									$ 0.39		$ 0.35	$ 1.14	$ 1.02
Preferred Stock
Proceeds from issuance of preferred stock | $												$ 77,392	$ 361,471
Restricted common stock | Chief executive officer
Deferred Compensation
Restricted stock vested during period (in shares)												246,508
Restricted stock vested during period, net settled (in shares)												120,665
Restricted common stock | Employees
Deferred Compensation
Shares withheld for taxes												162,785
Restricted common stock | Employees | 2020 Plan
Deferred Compensation
Grants during the period (in shares)												652,596
Total grant date fair value | $												$ 11,100
Restricted common stock | Employees | Vested on grant date | 2020 Plan
Deferred Compensation
Grants during the period (in shares)												232,899
Total grant date fair value | $												$ 4,000
Restricted common stock | Employees | First anniversaries | 2020 Plan
Deferred Compensation
Grants during the period (in shares)												217,840
Total grant date fair value | $												$ 3,700
Restricted common stock | Employees | Second anniversaries | 2020 Plan
Deferred Compensation
Grants during the period (in shares)												181,968
Total grant date fair value | $												$ 3,100
Restricted common stock | Employees | Third anniversaries | 2020 Plan
Deferred Compensation
Grants during the period (in shares)												9,951
Total grant date fair value | $												$ 200
Restricted common stock | Employees | Fourth anniversaries | 2020 Plan
Deferred Compensation
Grants during the period (in shares)												9,938
Total grant date fair value | $												$ 200
Restricted stock units (RSUs) | Director | 2020 Plan
Deferred Compensation
Grants during the period (in shares)												25,012
Total grant date fair value | $												$ 400
Restricted stock units (RSUs) | Chief executive officer | 2020 Plan
Deferred Compensation
Grants during the period (in shares)												189,873
Total grant date fair value | $												$ 3,300
Performance-based restricted stock | Chief executive officer
Deferred Compensation
Restricted stock vested during period (in shares)												381,503
Restricted stock vested during period, net settled (in shares)												186,772
6.25% Series E preferred stock
Preferred Stock
Return on the preferred shares issued to third parties by its subsidiary REIT (as a percent)												6.25%
6.25% Series F preferred stock
Preferred Stock
Return on the preferred shares issued to third parties by its subsidiary REIT (as a percent)												6.25%		6.25%
Common Stock
Common stock
Number of common stock sold (in shares)									3,170,688		800,000	19,625,788	20,222,879
Number of shares purchased													(1,399,999)
Distributions
Cash dividend declared (in dollars per share) | $ / shares	$ 0.40		$ 0.39		$ 0.38		$ 0.37
Preferred Stock | 6.375% Series D preferred stocks
Distributions
Cash dividend declared on redeemable preferred stock (in dollars per share) | $ / shares		0.3984375		$ 0.3984375		$ 0.3984375		$ 0.3984375
Preferred Stock | 6.25% Series E preferred stock
Common stock
Number of common stock sold (in shares)											5,750,000		5,750,000
Distributions
Cash dividend declared on redeemable preferred stock (in dollars per share) | $ / shares		0.390625		0.390625		0.390625		0.390625
Preferred Stock | 6.25% Series F preferred stock
Common stock
Number of common stock sold (in shares)												3,292,000
Distributions
Cash dividend declared (in dollars per share) | $ / shares		0.390625
Cash dividend declared on redeemable preferred stock (in dollars per share) | $ / shares				$ 0.390625		$ 0.390625		$ 0.46875
Operating Partnership Units
Noncontrolling Interest
Conversion ratio for operating partnership units to common stock shares												1
Operating Partnership Units | Special voting preferred shares
Noncontrolling Interest
Preferred stock, par value (in dollars per share) | $ / shares		$ 0.01							$ 0.01			$ 0.01
Number of vote per share of Special Voting Preferred Shares | Vote		1							1			1
OP units outstanding (in shares)		16,293,589							16,293,589			16,293,589
Voting power of outstanding stock (as a percent)												8.70%
Number of preferred stock shares paired with each OP units												1
Public offering | Common Stock
Common stock
Issued price per share (in dollars per share) | $ / shares										$ 16.57
Number of common stock sold (in shares)										7,475,000		12,150,788
Proceeds from issuance of shares under public offering | $										$ 123,700		$ 188,900
Public offering | Preferred Stock | 6.25% Series F preferred stock
Preferred Stock
Issuance of preferred stock (in shares)										3,292,000
Return on the preferred shares issued to third parties by its subsidiary REIT (as a percent)										6.25%
Proceeds from issuance of preferred stock | $										$ 77,100