Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenues:
Total Revenues	$ 755,073	$ 740,340	$ 657,515
Expenses:
Rental property operating expenses	259,461	250,850	222,146
Reimbursed expenses	2,476	1,580	4,004
General and administrative expenses	29,321	27,034	37,007
Interest expense	67,027	60,605	53,963
Impairment	0	14,829	0
Depreciation and amortization	288,092	288,648	257,149
Transaction costs	0	428	52,881
Other	2,131	2,091	1,109
Total costs and expenses	648,508	646,065	628,259
Income from unconsolidated joint ventures	6,801	7,947	12,666
Gain on sales of investments in unconsolidated joint ventures	13,083	45,767	0
Gain on investment property transactions	152,547	90,125	110,761
Net income	278,996	238,114	152,683
Net income attributable to noncontrolling interests	(410)	(836)	(2,265)
Net income available to common stockholders	$ 278,586	$ 237,278	$ 150,418
Net income per common share — basic (in usd per share)	$ 1.87	$ 1.60	$ 1.17
Net income per common share — diluted (in usd per share)	$ 1.87	$ 1.60	$ 1.17
Weighted average shares — basic (in shares)	148,666	148,277	128,060
Weighted average shares — diluted (in shares)	148,891	148,636	129,831
Dividends declared per common share (in usd per share)	$ 1.24	$ 1.20	$ 1.16
Rental property revenues
Revenues:
Total Revenues	$ 739,063	$ 721,883	$ 628,751
Fee income
Revenues:
Total Revenues	15,559	18,226	28,518
Other
Revenues:
Total Revenues	$ 451	$ 231	$ 246