Consolidated Statements of Changes in Equity - USD ($) $ in Thousands	Total	Common Stock	Paid-in Capital	Redeemable Perpetual Preferred Stock	Distributions in Excess of Accumulated Earnings	Accumulated Other Comprehensive Income (Loss)	Non-controlling Interests – Common OP Units
Beginning balance at Dec. 31, 2021	$ 1,486,171	$ 1,913	$ 1,593,362	$ 0	$ (183,689)	$ 3,524	$ 71,061
Increase (Decrease) in Stockholders' Equity
Exchange of Common OP Units for Common Stock	0		67				(67)
Issuance of Common Stock through employee stock purchase plan	513		513
Issuance of Common Stock	28,370	3	28,367
Compensation expenses related to restricted stock and stock options	2,590		2,590
Repurchase of Common Stock or Common OP Units	(3,449)		(3,449)
Adjustment for Common OP Unitholders in the Operating Partnership	0		(1,641)				1,641
Adjustment for fair market value of swap	9,924					9,924
Consolidated net income	87,050				82,906		4,144
Distributions	(80,187)				(76,375)		(3,812)
Other	(645)		(645)
Ending balance at Mar. 31, 2022	1,530,337	1,916	1,619,164	0	(177,158)	13,448	72,967
Beginning balance at Dec. 31, 2021	1,486,171	1,913	1,593,362	0	(183,689)	3,524	71,061
Increase (Decrease) in Stockholders' Equity
Adjustment for fair market value of swap	16,952
Ending balance at Sep. 30, 2022	1,519,389	1,916	1,625,751	0	(200,969)	20,476	72,215
Beginning balance at Mar. 31, 2022	1,530,337	1,916	1,619,164	0	(177,158)	13,448	72,967
Increase (Decrease) in Stockholders' Equity
Issuance of Common Stock through employee stock purchase plan	1,388		1,388
Compensation expenses related to restricted stock and stock options	2,681		2,681
Adjustment for Common OP Unitholders in the Operating Partnership	0		(303)				303
Adjustment for fair market value of swap	2,793					2,793
Consolidated net income	64,590			8	61,509		3,073
Distributions	(79,999)			(8)	(76,179)		(3,812)
Other	(54)		(54)
Ending balance at Jun. 30, 2022	1,521,736	1,916	1,622,876	0	(191,828)	16,241	72,531
Increase (Decrease) in Stockholders' Equity
Exchange of Common OP Units for Common Stock	0	0	203				(203)
Issuance of Common Stock through employee stock purchase plan	458		458
Compensation expenses related to restricted stock and stock options	2,654		2,654
Adjustment for Common OP Unitholders in the Operating Partnership	0		(342)				342
Adjustment for fair market value of swap	4,235					4,235
Consolidated net income	70,510				67,164		3,346
Distributions	(80,106)				(76,305)		(3,801)
Other	(98)		(98)
Ending balance at Sep. 30, 2022	1,519,389	1,916	1,625,751	0	(200,969)	20,476	72,215
Beginning balance at Dec. 31, 2022	1,517,485	1,916	1,628,618	0	(204,248)	19,119	72,080
Increase (Decrease) in Stockholders' Equity
Exchange of Common OP Units for Common Stock	0		198				(198)
Issuance of Common Stock through employee stock purchase plan	363		363
Compensation expenses related to restricted stock and stock options	2,549		2,549
Repurchase of Common Stock or Common OP Units	(1,932)		(1,932)
Adjustment for Common OP Unitholders in the Operating Partnership	0		168				(168)
Adjustment for fair market value of swap	(3,978)					(3,978)
Consolidated net income	86,459				82,371		4,088
Distributions	(87,462)				(83,326)		(4,136)
Other	(98)		(98)
Ending balance at Mar. 31, 2023	1,513,386	1,916	1,629,866	0	(205,203)	15,141	71,666
Beginning balance at Dec. 31, 2022	1,517,485	1,916	1,628,618	0	(204,248)	19,119	72,080
Increase (Decrease) in Stockholders' Equity
Adjustment for fair market value of swap	(3,555)
Ending balance at Sep. 30, 2023	1,497,007	1,917	1,641,553	0	(232,081)	15,564	70,054
Beginning balance at Mar. 31, 2023	1,513,386	1,916	1,629,866	0	(205,203)	15,141	71,666
Increase (Decrease) in Stockholders' Equity
Issuance of Common Stock through employee stock purchase plan	504		504
Compensation expenses related to restricted stock and stock options	8,584		8,584
Adjustment for Common OP Unitholders in the Operating Partnership	0		(503)				503
Adjustment for fair market value of swap	2,186					2,186
Consolidated net income	66,049			8	62,920		3,121
Distributions	(87,500)			(8)	(83,357)		(4,135)
Other	(97)		(97)
Ending balance at Jun. 30, 2023	1,503,112	1,916	1,638,354	0	(225,640)	17,327	71,155
Increase (Decrease) in Stockholders' Equity
Exchange of Common OP Units for Common Stock	0	1	812				(813)
Issuance of Common Stock through employee stock purchase plan	736		736
Compensation expenses related to restricted stock and stock options	1,799		1,799
Adjustment for Common OP Unitholders in the Operating Partnership	0		(27)				27
Adjustment for fair market value of swap	(1,763)					(1,763)
Consolidated net income	80,741				76,969	0	3,772
Distributions	(87,497)				(83,410)		(4,087)
Other	(121)		(121)
Ending balance at Sep. 30, 2023	$ 1,497,007	$ 1,917	$ 1,641,553	$ 0	$ (232,081)	$ 15,564	$ 70,054