CONSOLIDATED STATEMENT OF EQUITY - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Dividends in excess of net income [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest [Member]	Total
Balance at Dec. 31, 2017	$ 3	$ 936,046	$ (28,763)	$ 1,375	$ 2,529	$ 911,190
Balance (in shares) at Dec. 31, 2017	31,004,900
Issuance of common stock, net of issuance costs		(93)				(93)
Repurchase of common shares		(1,074)				(1,074)
Repurchase of common shares (in shares)	(22,071)
Issuance of restricted stock under the Omnibus Incentive Plan (in shares)	50,841
Forfeiture of restricted stock (in shares)	(411)
Stock-based compensation		602				602
Dividends and distributions declared for the period			(16,137)		(181)	(16,318)
Other comprehensive income (loss) - change in fair value of interest rate swaps				1,899	21	1,920
Net income			16,451		185	16,636
Balance at Mar. 31, 2018	$ 3	935,481	(28,449)	3,274	2,554	912,863
Balance (in shares) at Mar. 31, 2018	31,033,259
Balance at Dec. 31, 2017	$ 3	936,046	(28,763)	1,375	2,529	911,190
Balance (in shares) at Dec. 31, 2017	31,004,900
Balance at Dec. 31, 2018	$ 4	1,277,592	(42,945)	1,424	2,411	1,238,486
Balance (in shares) at Dec. 31, 2018	37,545,790
Issuance of common stock, net of issuance costs	$ 0	57,845	0	0	0	57,845
Issuance of common stock, net of issuance costs (in shares)	874,268
Repurchase of common shares	$ 0	(1,398)	0	0	0	(1,398)
Repurchase of common shares (in shares)	(21,868)
Issuance of restricted stock under the Omnibus Incentive Plan	$ 0	0	0	0	0	0
Issuance of restricted stock under the Omnibus Incentive Plan (in shares)	56,592
Stock-based compensation	$ 0	913	0	0	0	913
Dividends and distributions declared for the period	0	0	(21,342)	0	(193)	(21,535)
Other comprehensive income (loss) - change in fair value of interest rate swaps	0	0	0	(3,374)	(31)	(3,405)
Net income	0	0	18,347	0	169	18,516
Balance at Mar. 31, 2019	$ 4	$ 1,334,952	$ (45,940)	$ (1,950)	$ 2,356	$ 1,289,422
Balance (in shares) at Mar. 31, 2019	38,454,782