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, 2014	$ 113,462	$ 313	$ 246,041	$ (132,892)
Beginning balance, shares at Dec. 31, 2014		31,251,157
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock, net	162,963	$ 163	162,800
Issuance of common stock, net, shares		16,330,000
Vesting of restricted common stock, net of shares withheld for employee taxes	(145)	$ 1	(146)
Vesting of restricted common stock, net of shares withheld for employee taxes, shares		83,585
Amortization of stock-based compensation	1,522		1,522
Common dividend ($0.64 and $0.51 per share for the twelve months ended 12/31/2015 and nine months ended 9/30/2016, respectively)	(25,548)			(25,548)
Net income	10,034			10,034
Ending balance at Dec. 31, 2015	262,288	$ 477	410,217	(148,406)
Ending balance, shares at Dec. 31, 2015		47,664,742
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock, net	108,395	$ 99	108,296
Issuance of common stock, net, shares		9,958,012
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		119,134
Amortization of stock-based compensation	1,207		1,207
Common dividend ($0.64 and $0.51 per share for the twelve months ended 12/31/2015 and nine months ended 9/30/2016, respectively)	(29,565)			(29,565)
Net income	20,965			20,965
Ending balance at Sep. 30, 2016	$ 362,775	$ 577	$ 519,204	$ (157,006)
Ending balance, shares at Sep. 30, 2016		57,741,888