CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Total	Total Stockholders' Equity [Member]	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Cumulated Distributions in Excess of Net Income [Member]	Accumulated Other Comprehensive Loss [Member]	Noncontrolling Interest [Member]
Beginning balance (in shares) at Dec. 31, 2013			5,750,000	38,788,745
Beginning balance at Dec. 31, 2013	$ 460,164	$ 460,164	$ 58	$ 388	$ 534,639	$ (74,921)	$ 0	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	46,909	46,952				46,952		(43)
Other comprehensive income	(1,542)	(1,542)					(1,542)
Amortization of stock-based compensation	11,234	11,234			11,234
Common stock issuance, net (in shares)				20,258,256
Common stock issuance, net	507,930	507,930		$ 202	507,728
Preferred dividends	(10,242)	(10,242)				(10,242)
Common dividends	(72,630)	(72,630)				(72,630)
Beginning balance (in shares) at Dec. 31, 2014			5,750,000	59,047,001
Ending 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
Beginning 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)
Beginning 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