CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Total Stockholders’ Equity	Preferred Stock	Common Stock	Additional Paid-in Capital	Cumulative Distributions in Excess of Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests	Common Stock	Common Stock Total Stockholders’ Equity	Common Stock Common Stock	Common Stock Additional Paid-in Capital
Beginning Balance at Dec. 31, 2015	$ 693,744	$ 672,139	$ 0	$ 553	$ 722,722	$ (48,103)	$ (3,033)	$ 21,605
Beginning Balance, shares at Dec. 31, 2015				55,598,684
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock									$ 182,677	$ 182,677	$ 103	$ 182,574
Issuance of common stock, shares											10,350,000
Offering costs	(8,352)	(8,352)			(8,352)
Share-based compensation	1,961	965		$ 1	964			996
Share-based compensation, shares				71,650
Shares acquired to satisfy employee tax withholding requirements on vesting restricted stock	(204)	(204)			(204)
Shares acquired to satisfy employee tax withholding requirements on vesting restricted stock, shares				(11,681)
Conversion of units to common stock		287			287			(287)
Noncontrolling Interest, Increase from Business Combination	125							125
Conversion of units to common stock, shares				27,079
Net income	14,269	13,799				13,799		470
Other comprehensive loss	(4,407)	(4,295)					(4,295)	(112)
Common stock dividends	(16,429)	(16,429)				(16,429)
Distributions	(600)							(600)
Ending Balance at Jun. 30, 2016	862,784	840,587	0	$ 657	897,991	(50,733)	(7,328)	22,197
Ending Balance, shares at Jun. 30, 2016				66,035,732
Beginning Balance at Dec. 31, 2016	$ 962,140	939,315	86,651	$ 662	907,834	(59,277)	3,445	22,825
Beginning Balance, shares at Dec. 31, 2016	66,454,375			66,454,375
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock									$ 120,535	$ 120,535	$ 45	$ 120,490
Issuance of common stock, shares											4,567,161
Offering costs	$ (2,181)	(2,181)			(2,181)
Share-based compensation	2,853	1,198		$ 1	1,197			1,655
Share-based compensation, shares				84,439
Shares acquired to satisfy employee tax withholding requirements on vesting restricted stock	(404)	(404)			(404)
Shares acquired to satisfy employee tax withholding requirements on vesting restricted stock, shares				(17,253)
Conversion of units to common stock		346			346			(346)
Conversion of units to common stock, shares				34,180
Net income	25,576	24,913	2,644			22,269		663
Other comprehensive loss	(244)	(229)					(229)	(15)
Preferred stock dividends	(2,644)	(2,644)	(2,644)
Common stock dividends	(19,984)	(19,984)				(19,984)
Distributions	(669)							(669)
Ending Balance at Jun. 30, 2017	$ 1,084,978	$ 1,060,865	$ 86,651	$ 708	$ 1,027,282	$ (56,992)	$ 3,216	$ 24,113
Ending Balance, shares at Jun. 30, 2017	71,122,902			71,122,902