Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues
Rental income	$ 123,384	$ 117,740	$ 368,385	$ 342,787
Other operating	1,868	2,059	5,364	5,987
Revenues	125,252	119,799	373,749	348,774
Expenses
Property operating	50,171	46,777	146,305	133,790
General and administrative	7,299	10,802	23,498	27,157
Acquisition and pursuit costs	440	501	1,621	1,227
Depreciation and amortization	47,143	45,137	142,331	131,725
Expenses	105,053	103,217	313,755	293,899
Other Income (Expense)
Gain on sales of real estate assets	2,177	200	70,395	5,065
Interest expense	(14,154)	(14,181)	(42,556)	(41,619)
Impairment of real estate assets				(5,610)
Interest and other income (expense), net	8		225	(736)
Total other income (expense)	(11,969)	(13,981)	28,064	(42,900)
Net Income	$ 8,230	$ 2,601	$ 88,058	$ 11,975
Basic earnings per common share (in dollars per share)	$ 0.06	$ 0.02	$ 0.65	$ 0.08
Diluted earnings per common share (in dollars per share)	$ 0.06	$ 0.02	$ 0.65	$ 0.08
Weighted average common shares outstanding - basic	134,309,417	128,090,074	133,662,140	126,570,895
Weighted average common shares outstanding - diluted	134,357,227	128,168,684	133,736,169	126,656,585
Dividends declared, per common share, during the period (in dollars per share)	$ 0.30	$ 0.30	$ 0.90	$ 0.90
Revenue, Product and Service [Extensible List]	us-gaap:ServiceMember	us-gaap:ServiceMember	us-gaap:ServiceMember	us-gaap:ServiceMember