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]
Distributions to noncontrolling interests	(72)							(72)
Net income	263,270	263,258				263,258		12
Other comprehensive income (loss)	12,328	12,328					12,328
Amortization of stock-based compensation	4,434	4,434			4,434
Preferred stock redemption (in shares)			(5,750,000)
Preferred stock redemption	(143,750)		$ (58)		(138,191)	(5,501)
Common stock issuance, net (in shares)				27,747
Common stock issuance, net	(202)	(202)			(202)
Preferred dividends	(4,267)	(4,267)				(4,267)
Common dividends	(161,065)	(161,065)				(161,065)
Ending balance (in shares) at Jun. 30, 2018			0	178,283,590
Ending balance at Jun. 30, 2018	3,407,925	3,403,543	$ 0	$ 1,783	3,502,954	(125,606)	24,412	4,382
Beginning balance (in shares) at Mar. 31, 2018			5,750,000	178,282,370
Beginning balance at Mar. 31, 2018	3,426,566	3,422,151	$ 58	$ 1,783	3,638,109	(238,612)	20,813	4,415
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Distributions to noncontrolling interests	(35)							(35)
Net income	200,789	200,787				200,787		2
Other comprehensive income (loss)	3,599	3,599					3,599
Amortization of stock-based compensation	3,036	3,036			3,036
Preferred stock redemption (in shares)			(5,750,000)
Preferred stock redemption	(143,750)	(143,750)	$ (58)		(138,191)	(5,501)
Common stock issuance, net (in shares)				1,220
Preferred dividends	(1,706)	(1,706)				(1,706)
Common dividends	(80,574)	(80,574)				(80,574)
Ending balance (in shares) at Jun. 30, 2018			0	178,283,590
Ending balance at Jun. 30, 2018	3,407,925	3,403,543	$ 0	$ 1,783	3,502,954	(125,606)	24,412	4,382
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]
Distributions to noncontrolling interests	(73)							(73)
Net income	5,991	5,973				5,973		18
Other comprehensive income (loss)	(23,237)	(23,237)					(23,237)
Amortization of stock-based compensation	6,544	6,544			6,544
Common stock issuance, net (in shares)				11,208,496
Common stock issuance, net	211,614	211,614		$ 112	211,502
Common dividends	(162,708)	(162,708)				(162,708)
Ending balance (in shares) at Jun. 30, 2019			0	189,515,024
Ending balance at Jun. 30, 2019	3,260,376	3,256,098	$ 0	$ 1,895	3,725,971	(460,832)	(10,936)	4,278
Beginning balance (in shares) at Mar. 31, 2019			0	178,419,599
Beginning balance at Mar. 31, 2019	3,050,778	3,046,469	$ 0	$ 1,784	3,508,987	(462,555)	(1,747)	4,309
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Distributions to noncontrolling interests	(37)							(37)
Net income	83,683	83,677				83,677		6
Other comprehensive income (loss)	(9,189)	(9,189)					(9,189)
Amortization of stock-based compensation	3,274	3,274			3,274
Common stock issuance, net (in shares)				11,095,425
Common stock issuance, net	213,821	213,821		$ 111	213,710
Common dividends	(81,954)	(81,954)				(81,954)
Ending balance (in shares) at Jun. 30, 2019			0	189,515,024
Ending balance at Jun. 30, 2019	$ 3,260,376	$ 3,256,098	$ 0	$ 1,895	$ 3,725,971	$ (460,832)	$ (10,936)	$ 4,278