Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenues
Rental income	$ 131,746	$ 123,384	$ 388,620	$ 368,385
Interest from financing receivable, net	1,917		2,426
Other operating	2,969	1,868	7,347	5,364
Revenues	136,632	125,252	398,393	373,749
Expenses
Property operating	55,518	50,171	159,241	146,305
General and administrative	8,207	7,299	25,251	23,498
Acquisition and pursuit costs	974	440	2,388	1,621
Depreciation and amortization	50,999	47,143	150,904	142,331
Expenses	115,698	105,053	337,784	313,755
Other income (expense)
Gain on sales of real estate properties	1,186	2,177	41,046	70,395
Interest expense	(13,334)	(14,154)	(39,857)	(42,556)
Impairment of real estate properties	(10,669)		(16,581)
Equity loss from unconsolidated joint ventures	(183)	(66)	(404)	(194)
Interest and other income (expense), net		74	239	419
Total other income (expense)	(23,000)	(11,969)	(15,557)	28,064
Net (loss) income	$ (2,066)	$ 8,230	$ 45,052	$ 88,058
Basic earnings per common share (in dollars per share)	$ (0.02)	$ 0.06	$ 0.31	$ 0.65
Diluted earnings per common share (in dollars per share)	$ (0.02)	$ 0.06	$ 0.31	$ 0.65
Weighted average common shares outstanding - basic	143,817,619	134,309,417	141,521,193	133,662,140
Weighted average common shares outstanding - diluted	143,817,619	134,357,227	141,613,429	133,736,169
Revenue, Product and Service [Extensible List]	Service [Member]	Service [Member]