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 Loss	Noncontrolling Interests
Beginning balance (in shares) at Dec. 31, 2014			5,750,000	59,047,001
Beginning balance at Dec. 31, 2014	$ 941,823	$ 941,866	$ 58	$ 590	$ 1,053,601	$ (110,841)	$ (1,542)	$ (43)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	79,383	79,413				79,413		(30)
Other comprehensive income	(5,791)	(5,791)					(5,791)
Amortization of stock-based compensation	6,946	6,946			6,946
Common stock issuance, net (in shares)				6,135,334
Common stock issuance, net	142,056	142,056		$ 62	141,994
Preferred dividends	(10,242)	(10,242)				(10,242)
Common dividends	(100,478)	(100,478)				(100,478)
Contribution from noncontrolling interest	179							179
Ending balance (in shares) at Dec. 31, 2015			5,750,000	65,182,335
Ending balance at Dec. 31, 2015	1,053,876	1,053,770	$ 58	$ 652	1,202,541	(142,148)	(7,333)	106
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	70,205	70,276				70,276		(71)
Other comprehensive income	5,535	5,535					5,535
Amortization of stock-based compensation	8,559	8,559			8,559
Common stock issuance, net (in shares)				134,509
Common stock issuance, net	(1,512)	(1,512)		$ 1	(1,513)
Repurchase of common stock (in shares)				(31,230)
Repurchase of common stock	(725)	(725)			(725)
Preferred dividends	(10,242)	(10,242)				(10,242)
Common dividends	(110,087)	(110,087)				(110,087)
Ending balance (in shares) at Dec. 31, 2016			5,750,000	65,285,614
Ending balance at Dec. 31, 2016	1,015,609	1,015,574	$ 58	$ 653	1,208,862	(192,201)	(1,798)	35
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	158,365	158,383				158,383		(18)
Other comprehensive income	13,087	13,087					13,087
Change in noncontrolling interests	4,455							4,455
Distributions to noncontrolling interests	(30)							(30)
Amortization of stock-based compensation	9,244	9,244			9,244
Common stock issuance, net (in shares)				112,970,229
Common stock issuance, net	2,419,937	2,419,937		$ 1,130	2,418,807
Preferred dividends	(10,242)	(10,242)				(10,242)
Common dividends	(173,176)	(173,176)				(173,176)
Ending balance (in shares) at Dec. 31, 2017			5,750,000	178,255,843
Ending balance at Dec. 31, 2017	$ 3,437,249	$ 3,432,807	$ 58	$ 1,783	$ 3,636,913	$ (217,236)	$ 11,289	$ 4,442