Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Numerator for earnings per share - basic:
Net income		$ 86,783	$ 68,488	$ 77,186
Net income attributable to noncontrolling interests:
Operating Partnership		(2,211)	(1,797)	(2,155)
Partially owned properties	[1]	(607)	(574)	(548)
Preferred distributions		(13)	(1,241)	(1,209)
Net income attributable to common shareholders		83,952	64,876	73,274
Numerator for earnings per share - diluted:
Numerator for earnings per share - basic		83,952	64,876	73,274
Operating Partnership net income		2,211	1,797	2,155
Numerator for earnings per share - diluted		$ 86,163	$ 66,673	$ 75,429
Denominator for earnings per share - basic and diluted:
Weighted average number of shares outstanding - basic (in shares)		216,135,385	204,243,768	185,770,251
Effect of dilutive securities:
Noncontrolling interest - Operating Partnership units (in shares)		5,693,333	5,659,325	5,466,010
Denominator for earnings per share - diluted (in shares)		223,060,556	211,145,917	191,626,320
Earnings per share - basic (in dollars per share)		$ 0.39	$ 0.32	$ 0.39
Earnings per share - diluted (in dollars per share)		$ 0.39	$ 0.32	$ 0.39
Restricted common shares
Effect of dilutive securities:
Restricted common shares/units (in shares)		113,438	88,131	103,293
Restricted share units
Effect of dilutive securities:
Restricted common shares/units (in shares)		1,118,400	1,154,693	286,766

[1] Includes amounts attributable to redeemable noncontrolling interests.