Earnings per Share - Schedule of Components of Basic and Diluted EPS (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Basic EPS
Consolidated net income attributable to common stockholders	$ 6,657	$ 7,691	$ 13,027	$ 7,330	$ 6,596	$ 6,558	$ 7,521	$ 7,665	$ 34,705	$ 28,340	$ 28,927
Allocation of earnings to participating restricted shares									(336)	(307)	(321)
Consolidated net income attributable to unrestricted common stockholders									34,369	28,033	28,606
Effect of dilutive securities
Operating Partnership units									346		998
Restricted stock grants and Manager and director fee shares											321
Interest expense (add back) and assumed conversion of shares from convertible senior notes									10,200	8,786	5,289
Diluted EPS
Consolidated income attributable to common stockholders and dilutive securities									$ 44,915	$ 36,819	$ 35,214
Basic EPS
Weighted Average Number of Shares Issued, Basic									19,710,482	18,642,526
Allocation of earnings to participating restricted shares (in shares)									0	0	0
Weighted Average Number of Shares Outstanding, Basic									19,710,482	18,642,526	18,074,143
Effect of dilutive securities
Operating Partnership units (in shares)									241,093		624,106
Restricted stock grants and Manager and director fee shares (in shares)											203,083
Interest expense (add back) and assumed conversion of shares from convertible senior notes (in shares)									8,221,642	7,188,020	4,417,189
Diluted EPS
Consolidated net income attributable to common stockholders and dilutive securities (in shares)									28,173,217	25,830,546	23,318,521
Per Share Amount
Consolidated net income attributable to unrestricted common stockholders (in dollars per share)	$ 0.31	$ 0.39	$ 0.67	$ 0.39	$ 0.35	$ 0.35	$ 0.40	$ 0.41	$ 1.74	$ 1.50	$ 1.58
Consolidated net income attributable to common stockholders and dilutive securities (in dollars per share)	$ 0.31	$ 0.36	$ 0.56	$ 0.36	$ 0.34	$ 0.34	$ 0.37	$ 0.38	$ 1.59	$ 1.43	$ 1.51