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, 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)	36,005					35,341	35,341	664
Common stock issued pursuant to stock based compensation	(904)		50	(954)			(904)
Amortization of stock options and restricted stock, net of forfeitures	607			607			607
Contributions from nonredeemable noncontrolling interests	2,581							2,581
Distributions to nonredeemable noncontrolling interests	(724)							(724)
Common dividends	(30,492)					(30,492)	(30,492)
Ending 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
Beginning balance at Dec. 31, 2019	4,427,835	1,717	149,347	5,493,883	(148,473)	(1,137,200)	4,359,274	68,561
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	175,309					174,943	174,943	366
Common stock issued pursuant to stock based compensation	(1,265)		60	(1,325)			(1,265)
Common stock issued pursuant to unitholder redemption	0	(1,717)	1,719	45,032			45,034	(45,034)
Amortization of stock options and restricted stock, net of forfeitures	1,284		(1)	1,285			1,284
Contributions from nonredeemable noncontrolling interests	1,036							1,036
Distributions to nonredeemable noncontrolling interests	(638)							(638)
Common dividends	(44,563)					(44,563)	(44,563)
Ending balance at Mar. 31, 2020	$ 4,558,998	$ 0	$ 151,125	$ 5,538,875	$ (148,473)	$ (1,006,820)	$ 4,534,707	$ 24,291