Condensed Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Cumulative Distributions in Excess of Earnings [Member]
Beginning balance at Dec. 31, 2015	$ 262,288	$ 477	$ 410,217	$ (148,406)
Beginning balance, shares at Dec. 31, 2015		47,664,742
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock, net	200,398	$ 170	200,228
Issuance of common stock, net, shares		17,023,824
Vesting of restricted common stock, net of shares withheld for employee taxes	(515)	$ 1	(516)
Vesting of restricted common stock, net of shares withheld for employee taxes, shares		127,784
Amortization of stock-based compensation	1,546		1,546
Common dividend ($0.185 and $0.68 per share for the three months ended 3/31/17 and year ended 12/31/2016, respectively) (in usd per share)	(40,640)			(40,640)
Net income	29,353			29,353
Ending balance at Dec. 31, 2016	452,430	$ 648	611,475	(159,693)
Ending balance, shares at Dec. 31, 2016		64,816,350
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock, net	108,122	$ 72	108,050
Issuance of common stock, net, shares		7,174,587
Vesting of restricted common stock, net of shares withheld for employee taxes, shares		9,360
Amortization of stock-based compensation	536		536
Common dividend ($0.185 and $0.68 per share for the three months ended 3/31/17 and year ended 12/31/2016, respectively) (in usd per share)	(13,422)			(13,422)
Net income	10,281			10,281
Ending balance at Mar. 31, 2017	$ 557,947	$ 720	$ 720,061	$ (162,834)
Ending balance, shares at Mar. 31, 2017		72,000,297