Condensed Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Cumulative Distributions in Excess of Earnings
Beginning balance at Dec. 31, 2017	$ 594,617	$ 755	$ 783,237	$ (189,375)
Beginning balance (in shares) at Dec. 31, 2017		75,478,202
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock, net	(27)	$ 0	(27)
Issuance of common stock, net, (in shares)		0
Vesting of restricted common stock, net of shares withheld for employee taxes	(605)		(605)
Vesting of restricted common stock, net of shares withheld for employee taxes (in shares)		43,844
Amortization of stock-based compensation	904		904
Common dividends ($0.225 and $0.205 per share for the three months ended 3/31/2019 and 3/31/2018, respectively) (in usd per share)	(15,608)			(15,608)
Net income	14,607			14,607
Ending balance at Mar. 31, 2018	593,888	$ 755	783,509	(190,376)
Ending balance (in shares) at Mar. 31, 2018		75,522,046
Beginning balance at Dec. 31, 2018	768,247	$ 859	965,578	(198,190)
Beginning balance (in shares) at Dec. 31, 2018		85,867,044
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock, net	47,243	$ 24	47,219
Issuance of common stock, net, (in shares)		2,459,000
Vesting of restricted common stock, net of shares withheld for employee taxes	(1,495)	$ 1	(1,496)
Vesting of restricted common stock, net of shares withheld for employee taxes (in shares)		72,229
Amortization of stock-based compensation	994		994
Common dividends ($0.225 and $0.205 per share for the three months ended 3/31/2019 and 3/31/2018, respectively) (in usd per share)	(20,011)			(20,011)
Net income	16,053			16,053
Ending balance at Mar. 31, 2019	$ 811,031	$ 884	$ 1,012,295	$ (202,148)
Ending balance (in shares) at Mar. 31, 2019		88,398,273