Condensed Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Additional Paid-In Capital	Treasury Stock	Distributions in Excess of Net Income	Stockholders’ Investment	Nonredeemable Noncontrolling Interests
Beginning balance at Dec. 31, 2017	$ 2,825,111	$ 1,717	$ 107,587	$ 3,932,689	$ (148,373)	$ (1,121,647)	$ 2,771,973	$ 53,138
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	38,155					37,319	37,319	836
Common stock issued pursuant to stock based compensation	(567)		99	(566)	(100)		(567)
Amortization of stock options and restricted stock, net of forfeitures	1,122		(3)	1,125			1,122
Contributions from nonredeemable noncontrolling interests	1,708							1,708
Distributions to nonredeemable noncontrolling interests	(873)							(873)
Common dividends	(54,641)					(54,641)	(54,641)
Ending balance at Jun. 30, 2018	2,832,344	1,717	107,683	3,933,248	(148,473)	(1,116,640)	2,777,535	54,809
Beginning balance at Mar. 31, 2018	2,835,915	1,717	107,643	3,932,416	(148,373)	(1,110,590)	2,782,813	53,102
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	21,749					21,276	21,276	473
Common stock issued pursuant to stock based compensation	192		41	251	(100)		192
Amortization of stock options and restricted stock, net of forfeitures	580		(1)	581			580
Contributions from nonredeemable noncontrolling interests	1,708							1,708
Distributions to nonredeemable noncontrolling interests	(474)							(474)
Common dividends	(27,326)					(27,326)	(27,326)
Ending balance at Jun. 30, 2018	2,832,344	1,717	107,683	3,933,248	(148,473)	(1,116,640)	2,777,535	54,809
Beginning balance at Dec. 31, 2018	2,821,156	1,717	107,681	3,934,385	(148,473)	(1,129,445)	2,765,865	55,291
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	13,423					12,932	12,932	491
Common stock issued in merger	1,598,189		41,576	1,556,613			1,598,189
Common stock issued pursuant to stock based compensation	509		91	418			509
Amortization of stock options and restricted stock, net of forfeitures	1,232			1,232			1,232
Nonredeemable noncontrolling interests acquired in merger	5,187							5,187
Contributions from nonredeemable noncontrolling interests	4,241							4,241
Distributions to nonredeemable noncontrolling interests	(1,265)							(1,265)
Common dividends	(73,054)					(73,054)	(73,054)
Ending balance at Jun. 30, 2019	4,369,618	1,717	149,348	5,492,648	(148,473)	(1,189,567)	4,305,673	63,945
Beginning balance at Mar. 31, 2019	2,828,229	1,717	107,731	3,934,038	(148,473)	(1,124,596)	2,770,417	57,812
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(22,582)					(22,409)	(22,409)	(173)
Common stock issued in merger	1,598,189		41,576	1,556,613			1,598,189
Common stock issued pursuant to stock based compensation	1,414		41	1,373			1,414
Amortization of stock options and restricted stock, net of forfeitures	624			624			624
Nonredeemable noncontrolling interests acquired in merger	5,187							5,187
Contributions from nonredeemable noncontrolling interests	1,660							1,660
Distributions to nonredeemable noncontrolling interests	(541)							(541)
Common dividends	(42,562)					(42,562)	(42,562)
Ending balance at Jun. 30, 2019	$ 4,369,618	$ 1,717	$ 149,348	$ 5,492,648	$ (148,473)	$ (1,189,567)	$ 4,305,673	$ 63,945