CONDENSED CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Total	Total Stockholders’ Equity	Preferred Stock	Common Stock	Additional Paid-in Capital	Cumulative Distributions in Excess of Net Income	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests
Beginning balance (in shares) at Dec. 31, 2017			5,750,000	178,255,843
Beginning balance at Dec. 31, 2017	$ 3,437,249	$ 3,432,807	$ 58	$ 1,783	$ 3,636,913	$ (217,236)	$ 11,289	$ 4,442
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	298,498	298,476				298,476		22
Other comprehensive income (loss)	14,273	14,273					14,273
Distributions to noncontrolling interests	(107)							(107)
Amortization of stock-based compensation	7,357	7,357			7,357
Preferred stock redemption (in shares)			(5,750,000)
Preferred stock redemption	(143,750)		$ (58)		(138,191)	(5,501)
Common stock issuance, net (in shares)				29,132
Common stock issuance, net	(202)	(202)			(202)
Preferred dividends	(4,267)	(4,267)				(4,267)
Common dividends	(241,793)	(241,793)				(241,793)
Ending balance (in shares) at Sep. 30, 2018			0	178,284,975
Ending balance at Sep. 30, 2018	3,367,258	3,362,901	$ 0	$ 1,783	3,505,877	(171,116)	26,357	4,357
Beginning balance (in shares) at Jun. 30, 2018			0	178,283,590
Beginning balance at Jun. 30, 2018	3,407,925	3,403,543	$ 0	$ 1,783	3,502,954	(125,606)	24,412	4,382
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	35,228	35,218				35,218		10
Other comprehensive income (loss)	1,945	1,945					1,945
Distributions to noncontrolling interests	(35)							(35)
Amortization of stock-based compensation	2,923	2,923			2,923
Common stock issuance, net (in shares)				1,385
Common dividends	(80,728)	(80,728)				(80,728)
Ending balance (in shares) at Sep. 30, 2018			0	178,284,975
Ending balance at Sep. 30, 2018	3,367,258	3,362,901	$ 0	$ 1,783	3,505,877	(171,116)	26,357	4,357
Beginning balance (in shares) at Dec. 31, 2018			0	178,306,528
Beginning balance at Dec. 31, 2018	3,254,747	3,250,414	$ 0	$ 1,783	3,507,925	(271,595)	12,301	4,333
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	29,277	29,255				29,255		22
Other comprehensive income (loss)	(31,696)	(31,696)					(31,696)
Buyout of noncontrolling interests	(200)	4,039			4,039			(4,239)
Distributions to noncontrolling interests	(116)							(116)
Amortization of stock-based compensation	10,474	10,474			10,474
Common stock issuance, net (in shares)				15,390,373
Common stock issuance, net	301,300	301,300		$ 154	301,146
Common dividends	(248,867)	(248,867)				(248,867)
Ending balance (in shares) at Sep. 30, 2019			0	193,696,901
Ending balance at Sep. 30, 2019	3,282,417	3,282,417	$ 0	$ 1,937	3,823,584	(523,709)	(19,395)	0
Beginning balance (in shares) at Jun. 30, 2019			0	189,515,024
Beginning balance at Jun. 30, 2019	3,260,376	3,256,098	$ 0	$ 1,895	3,725,971	(460,832)	(10,936)	4,278
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	23,286	23,282				23,282		4
Other comprehensive income (loss)	(8,459)	(8,459)					(8,459)
Buyout of noncontrolling interests	(200)	4,039			4,039			(4,239)
Distributions to noncontrolling interests	(43)							(43)
Amortization of stock-based compensation	3,930	3,930			3,930
Common stock issuance, net (in shares)				4,181,877
Common stock issuance, net	89,686	89,686		$ 42	89,644
Common dividends	(86,159)	(86,159)				(86,159)
Ending balance (in shares) at Sep. 30, 2019			0	193,696,901
Ending balance at Sep. 30, 2019	$ 3,282,417	$ 3,282,417	$ 0	$ 1,937	$ 3,823,584	$ (523,709)	$ (19,395)	$ 0