CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($)	Total	Common Stock	Additional Paid-in Capital	Distributions In Excess Of Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interest in Joint Ventures
BALANCE at Dec. 31, 2018	$ 904,703,000	$ 4,000	$ 1,222,547,000	$ (326,193,000)	$ 6,701,000	$ 1,644,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	123,340,000	0	0	121,662,000	0	1,678,000
Net unrealized change in fair value of interest rate swaps	(3,894,000)	0	0	0	(3,894,000)	0
Common dividends declared - $2.94, $3.08, and $3.58 per share in 2019, 2020, and 2021 respectively	(111,771,000)	0	0	(111,771,000)	0	0
Stock-based compensation, net of forfeitures	9,374,000	0	9,374,000	0	0	0
Issuance of 2,388,342, 709,924, and 1,551,181 shares of common stock, common stock offering, net of expenses in 2019, 2020, and 2021 respectively	284,710,000	0	284,710,000	0	0	0
Issuance of 1,893, zero, and zero shares of common stock, dividend reinvestment plan in 2019, 2020, and 2021 respectively	212,000	0	212,000	0	0	0
Withheld 28,955, 36,445, and 30,252 shares of common stock to satisfy tax withholding obligations in connection with the vesting of restricted stock in 2019, 2020, and 2021 respectively	(2,788,000)	0	(2,788,000)	0	0	0
Contributions from noncontrolling interest	821,000	0	0	0	0	821,000
Net distributions to noncontrolling interest	(2,378,000)	0	0	0	0	(2,378,000)
BALANCE at Dec. 31, 2019	$ 1,202,329,000	4,000	1,514,055,000	(316,302,000)	2,807,000	1,765,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock offerings (in shares)	2,388,342
Withheld Shares Of Common Stock To Satisfy Tax Withholding Obligations In Connection With Vesting Of Restricted Stock Shares	28,955
Common dividends declared - per share (in dollars per share)	$ 2.94
Dividend reinvestment plan (in shares)	1,893
Net income	$ 108,391,000	0	0	108,363,000	0	28,000
Net unrealized change in fair value of interest rate swaps	(13,559,000)	0	0	0	(13,559,000)	0
Common dividends declared - $2.94, $3.08, and $3.58 per share in 2019, 2020, and 2021 respectively	(121,728,000)	0	0	(121,728,000)	0	0
Stock-based compensation, net of forfeitures	8,502,000	0	8,502,000	0	0	0
Issuance of 2,388,342, 709,924, and 1,551,181 shares of common stock, common stock offering, net of expenses in 2019, 2020, and 2021 respectively	92,663,000	0	92,663,000	0	0	0
Withheld 28,955, 36,445, and 30,252 shares of common stock to satisfy tax withholding obligations in connection with the vesting of restricted stock in 2019, 2020, and 2021 respectively	(4,939,000)	0	(4,939,000)	0	0	0
Contributions from noncontrolling interest	20,000	0	0	0	0	20,000
Net distributions to noncontrolling interest	(115,000)	0	0	0	0	(115,000)
Sale of noncontrolling interest in joint ventures	(1,046,000)	0	(228,000)	0	0	(818,000)
BALANCE at Dec. 31, 2020	$ 1,270,518,000	4,000	1,610,053,000	(329,667,000)	(10,752,000)	880,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock offerings (in shares)	709,924
Withheld Shares Of Common Stock To Satisfy Tax Withholding Obligations In Connection With Vesting Of Restricted Stock Shares	36,445
Common dividends declared - per share (in dollars per share)	$ 3.08
Net income	$ 157,638,000	0	0	157,557,000	0	81,000
Net unrealized change in fair value of interest rate swaps	12,054,000	0	0	0	12,054,000	0
Common dividends declared - $2.94, $3.08, and $3.58 per share in 2019, 2020, and 2021 respectively	(145,946,000)	0	0	(145,946,000)	0	0
Stock-based compensation, net of forfeitures	9,847,000	0	9,847,000	0	0	0
Issuance of 2,388,342, 709,924, and 1,551,181 shares of common stock, common stock offering, net of expenses in 2019, 2020, and 2021 respectively	271,155,000	0	271,155,000	0	0	0
Withheld 28,955, 36,445, and 30,252 shares of common stock to satisfy tax withholding obligations in connection with the vesting of restricted stock in 2019, 2020, and 2021 respectively	(4,240,000)	0	(4,240,000)	0	0	0
Contributions from noncontrolling interest	584,000	0	0	0	0	584,000
Net distributions to noncontrolling interest	(150,000)	0	5,000	0	0	(155,000)
BALANCE at Dec. 31, 2021	$ 1,571,460,000	$ 4,000	$ 1,886,820,000	$ (318,056,000)	$ 1,302,000	$ 1,390,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock offerings (in shares)	1,551,181
Withheld Shares Of Common Stock To Satisfy Tax Withholding Obligations In Connection With Vesting Of Restricted Stock Shares	30,252
Common dividends declared - per share (in dollars per share)	$ 3.58