CONDENSED CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Total	Cumulative Effect in Period of Adoption	Total Stockholders’ Equity	Total Stockholders’ Equity Cumulative Effect in Period of Adoption	Common Stock	Additional Paid-in Capital	Cumulative Distributions in Excess of Net Income	Cumulative Distributions in Excess of Net Income Cumulative Effect in Period of Adoption	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interest
Beginning balance (in shares) at Dec. 31, 2018					178,306,528
Beginning balance at Dec. 31, 2018	$ 3,254,747	$ (32,502)	$ 3,250,414		$ 1,783	$ 3,507,925	$ (271,595)	$ (32,502)	$ 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 interest	(200)		4,039			4,039				(4,239)
Distributions to noncontrolling interest	(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					193,696,901
Ending balance at Sep. 30, 2019	$ 3,282,417		3,282,417		$ 1,937	3,823,584	(523,709)		(19,395)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201602Member
Beginning balance (in shares) at Dec. 31, 2018					178,306,528
Beginning balance at Dec. 31, 2018	$ 3,254,747	(32,502)	3,250,414		$ 1,783	3,507,925	(271,595)	(32,502)	12,301	4,333
Ending balance (in shares) at Dec. 31, 2019					205,208,018
Ending balance at Dec. 31, 2019	3,488,460	(167)	3,488,460	$ (167)	$ 2,052	4,072,079	(573,283)	(167)	(12,388)	0
Beginning balance (in shares) at Jun. 30, 2019					189,515,024
Beginning balance at Jun. 30, 2019	3,260,376		3,256,098		$ 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 interest	(200)		4,039			4,039				(4,239)
Distributions to noncontrolling interest	(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					193,696,901
Ending balance at Sep. 30, 2019	3,282,417		3,282,417		$ 1,937	3,823,584	(523,709)		(19,395)	0
Beginning balance (in shares) at Dec. 31, 2019					205,208,018
Beginning balance at Dec. 31, 2019	3,488,460	(167)	3,488,460	(167)	$ 2,052	4,072,079	(573,283)	(167)	(12,388)	0
Ending balance (in shares) at Jun. 30, 2020					205,560,680
Ending balance at Jun. 30, 2020	3,361,251		3,361,251		$ 2,056	4,078,737	(663,901)		(55,641)	0
Beginning balance (in shares) at Dec. 31, 2019					205,208,018
Beginning balance at Dec. 31, 2019	3,488,460	$ (167)	3,488,460	$ (167)	$ 2,052	4,072,079	(573,283)	$ (167)	(12,388)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	101,300		101,300				101,300
Other comprehensive income (loss)	(36,782)		(36,782)						(36,782)
Amortization of stock-based compensation	7,582		7,582			7,582
Common stock issuance, net (in shares)					1,720,307
Common stock issuance, net	21,625		21,625		$ 17	21,608
Common dividends	(217,678)		(217,678)				(217,678)
Ending balance (in shares) at Sep. 30, 2020					206,928,325
Ending balance at Sep. 30, 2020	$ 3,364,340		3,364,340		$ 2,069	4,101,269	(689,828)		(49,170)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Beginning balance (in shares) at Jun. 30, 2020					205,560,680
Beginning balance at Jun. 30, 2020	$ 3,361,251		3,361,251		$ 2,056	4,078,737	(663,901)		(55,641)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	36,460		36,460				36,460
Other comprehensive income (loss)	6,471		6,471						6,471
Amortization of stock-based compensation	1,625		1,625			1,625
Common stock issuance, net (in shares)					1,367,645
Common stock issuance, net	20,920		20,920		$ 13	20,907
Common dividends	(62,387)		(62,387)				(62,387)
Ending balance (in shares) at Sep. 30, 2020					206,928,325
Ending balance at Sep. 30, 2020	$ 3,364,340		$ 3,364,340		$ 2,069	$ 4,101,269	$ (689,828)		$ (49,170)	$ 0