Consolidated Statements of Changes In Equity - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Paid-in Capital	Redeemable Perpetual Preferred  Stock	Distributions in Excess of Accumulated Earnings	Distributions in Excess of Accumulated Earnings Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Income (Loss)	Non- Controlling Interests – Common OP Units
Beginning balance at Dec. 31, 2018	$ 1,193,344		$ 1,792	$ 1,328,495	$ 0	$ (211,034)		$ 2,299	$ 71,792
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	Accounting Standards Update 2016-13 [Member]
Exchange of Common OP Units for Common Stock	$ 0		10	6,539					(6,549)
Issuance of Common Stock through exercise of options	53			53
Issuance of Common Stock through employee stock purchase plan	2,429			2,429
Issuance of Common Stock	59,319		10	59,309
Compensation expenses related to restricted stock and stock options	10,481			10,481
Repurchase of Common Stock or Common OP Units	(53)			(53)
Adjustment for Common OP Unitsholders in the Operating Partnership	0			(3,210)					3,210
Adjustment for fair market value of swap	(2,679)							(2,679)
Consolidated net income	295,922				16	279,123			16,783
Distributions	(235,581)				(16)	(222,407)			(13,158)
Other	(1,347)			(1,347)
Ending balance at Dec. 31, 2019	1,321,888	$ (3,875)	1,812	1,402,696	0	(154,318)	$ (3,875)	(380)	72,078
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exchange of Common OP Units for Common Stock	0		1	81					(82)
Issuance of Common Stock through employee stock purchase plan	2,026			2,026
Compensation expenses related to restricted stock and stock options	11,527			11,527
Repurchase of Common Stock or Common OP Units	(3,962)			(3,962)
Adjustment for Common OP Unitsholders in the Operating Partnership	0			(300)					300
Adjustment for fair market value of swap	380							380
Consolidated net income	241,416				16	228,268			13,132
Distributions	(263,974)				(16)	(249,598)			(14,360)
Other	(671)			(671)
Ending balance at Dec. 31, 2020	1,304,755		1,813	1,411,397	0	(179,523)		0	71,068
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exchange of Common OP Units for Common Stock	0		16	10,820					(10,836)
Issuance of OP Units	34,005								34,005
Issuance of Common Stock through employee stock purchase plan	2,224			2,224
Issuance of Common Stock	140,254		84	140,170
Compensation expenses related to restricted stock and stock options	10,855			10,855
Repurchase of Common Stock or Common OP Units	(2,814)			(2,814)
Adjustment for Common OP Unitsholders in the Operating Partnership	0			22,961					(22,961)
Adjustment for fair market value of swap	3,524							3,524
Consolidated net income	276,000				16	262,462			13,522
Distributions	(280,381)				(16)	(266,628)			(13,737)
Other	(2,251)			(2,251)
Ending balance at Dec. 31, 2021	$ 1,486,171		$ 1,913	$ 1,593,362	$ 0	$ (183,689)		$ 3,524	$ 71,061