Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues
Rental income	$ 122,358	$ 114,351	$ 245,001	$ 225,046
Other operating	1,332	1,966	3,496	3,928
Revenues	123,690	116,317	248,497	228,974
Expenses
Property operating	46,580	44,286	96,134	87,012
General and administrative	7,434	7,845	16,199	16,355
Acquisition and pursuit costs	431	422	1,181	726
Depreciation and amortization	47,691	43,926	95,188	86,588
Expenses	102,136	96,479	208,702	190,681
Other Income (Expense)
Gain on sales of real estate assets	68,267	4,849	68,218	4,865
Interest expense	(14,442)	(13,850)	(28,402)	(27,438)
Impairment of real estate assets		(5,610)		(5,610)
Interest and other income (expense), net	134	(743)	217	(735)
Total other income (expense)	53,959	(15,354)	40,033	(28,918)
Net Income	$ 75,513	$ 4,484	$ 79,828	$ 9,375
Basic earnings per common share (in dollars per share)	$ 0.56	$ 0.03	$ 0.59	$ 0.07
Diluted earnings per common share (in dollars per share)	$ 0.56	$ 0.03	$ 0.59	$ 0.07
Weighted average common shares outstanding - basic	133,633,646	127,449,454	133,334,946	125,798,715
Weighted average common shares outstanding - diluted	133,695,912	127,524,607	133,420,312	125,889,355
Dividends declared, per common share, during the period (in dollars per share)	$ 0.30	$ 0.30	$ 0.60	$ 0.60
Revenue, Product and Service [Extensible List]	us-gaap:OtherOperatingRevenueMember	us-gaap:OtherOperatingRevenueMember	us-gaap:OtherOperatingRevenueMember	us-gaap:OtherOperatingRevenueMember