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, 2015	$ 2	$ 482,514	$ (28,262)	$ (3,130)	$ 2,496	$ 453,620
Balance (in shares) at Dec. 31, 2015	20,637,301
Issuance of common stock, net of issuance costs	$ 1	228,010	0	0	0	228,011
Issuance of common stock, net of issuance costs (in shares)	5,461,459
Repurchase of common shares	$ 0	(712)	0	0	0	(712)
Repurchase of common shares (in shares)	(20,569)
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)	93,363
Forfeiture of restricted stock	$ 0	0	0	0	0	0
Forfeiture of restricted stock (in shares)	(6,577)
Stock-based compensation	$ 0	2,257	0	0	0	2,257
Dividends and distributions declared for the period	0	0	(45,414)	0	(667)	(46,081)
Other comprehensive income (loss) - change in fair value of interest rate swaps	0	0	0	2,594	24	2,618
Net income	0	0	45,118	0	679	45,797
Balance at Dec. 31, 2016	$ 3	712,069	(28,558)	(536)	2,532	685,510
Balance (in shares) at Dec. 31, 2016	26,164,977
Issuance of common stock, net of issuance costs	$ 0	222,695	0	0	0	222,695
Issuance of common stock, net of issuance costs (in shares)	4,786,604
Repurchase of common shares	$ 0	(1,111)	0	0	0	(1,111)
Repurchase of common shares (in shares)	(23,925)
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)	88,466
Forfeiture of restricted stock	$ 0	0	0	0	0	0
Forfeiture of restricted stock (in shares)	(11,222)
Stock-based compensation	$ 0	2,393	0	0	0	2,393
Dividends and distributions declared for the period	0	0	(58,317)	0	(705)	(59,022)
Other comprehensive income (loss) - change in fair value of interest rate swaps	0	0	0	1,911	24	1,935
Net income	0	0	58,112	0	678	58,790
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	$ 1	339,743	0	0	0	339,744
Issuance of common stock, net of issuance costs (in shares)	6,507,263
Repurchase of common shares	$ 0	(1,145)	0	0	0	(1,145)
Repurchase of common shares (in shares)	(23,407)
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)	57,882
Forfeiture of restricted stock	$ 0	0	0	0	0	0
Forfeiture of restricted stock (in shares)	(848)
Stock-based compensation	$ 0	2,948	0	0	0	2,948
Dividends and distributions declared for the period	0	0	(72,354)	0	(749)	(73,103)
Other comprehensive income (loss) - change in fair value of interest rate swaps	0	0	0	49	5	54
Net income	0	0	58,172	0	626	58,798
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