Consolidated and Combined Statement of Equity - USD ($) $ in Thousands	Total	Total Shareholders’ Equity	Par Value	Additional Paid in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)	Total Noncontrolling Interests	Operating Partnership Noncontrolling interest	Partially Owned Properties Noncontrolling Interest
Shareholders' equity, beginning balance at Dec. 31, 2013	$ 240,837	$ 204,904	$ 215	$ 213,359	$ (8,670)		$ 35,933	$ 35,310	$ 623
Increase (Decrease) in Stockholders' Equity
Net proceeds from sale of common shares	350,385	350,385	272	350,113
Restricted share award grants, net	2,060	2,060	2	2,100	(42)
Issuance of common shares in connection with the Ziegler shared service amendment payment	1,800	1,800	1	1,799
Purchase of OP Units	(7,546)						(7,546)	(7,546)
Conversion of OP Units		13,286	20	13,266			(13,286)	(13,286)
Dividends/distributions declared	(42,313)	(39,048)			(39,048)		(3,265)	(3,265)
Issuance of common shares and OP Units in connection with acquisitions	28,589						28,589	28,589
Distributions	(185)						(185)		(185)
Change in fair value of interest rate swap agreements	0
Adjustment for Noncontrolling Interests ownership in Operating Partnership		5,380		5,380			(5,380)	(5,380)
Shareholders' equity, ending balance at Dec. 31, 2014	569,209	534,730	510	586,017	(51,797)		34,479	33,727	752
Increase (Decrease) in Stockholders' Equity
Net (loss) income	(4,418)	(4,037)			(4,037)		(381)	(695)	314
Net proceeds from sale of common shares	545,117	545,117	361	544,756
Restricted share award grants, net	2,908	2,908	1	3,191	(284)
Purchase of OP Units	(1,088)						(1,088)	(1,088)
Conversion of OP Units	0	171		171			(171)	(171)
Dividends/distributions declared	(70,886)	(67,542)			(67,542)		(3,344)	(3,344)
Preferred distributions	(1,189)	(1,189)			(1,189)
Issuance of common shares and OP Units in connection with acquisitions	10,973						10,973	10,973
Contributions	8,962						8,962		8,962
Distributions	(213)						(213)		(213)
Change in market value of Redeemable Noncontrolling Interests in Operating Partnership	73	73		73
Change in fair value of interest rate swap agreements	0
Adjustment for Noncontrolling Interests ownership in Operating Partnership	0	(4,778)		(4,778)			4,778	4,778
Shareholders' equity, ending balance at Dec. 31, 2015	1,076,461	1,021,132	872	1,129,284	(109,024)		55,329	45,451	9,878
Increase (Decrease) in Stockholders' Equity
Net (loss) income	12,741	11,788			11,788		953	576	377
Net proceeds from sale of common shares	766,841	766,841	473	766,368
Restricted share award grants, net	4,434	4,434	1	4,893	(460)
Purchase of OP Units	(3,671)						(3,671)	(3,671)
Conversion of OP Units		11,619	6	11,613			(11,619)	(11,619)
Dividends/distributions declared	(119,007)	(115,901)			(115,901)		(3,106)	(3,106)
Preferred distributions	(1,857)	(1,857)			(1,857)
Issuance of common shares and OP Units in connection with acquisitions	23,848	17,079	10	17,069			6,769	6,869	(100)
Contributions	50						50		50
Distributions	(543)						(543)		(543)
Change in market value of Redeemable Noncontrolling Interests in Operating Partnership	245	(245)		(245)
Reclassification of Noncontrolling Interest - partially owned properties	8,514						(8,514)		(8,514)
Buyout of Noncontrolling Interests - partially owned properties	611	53		53			(664)		(664)
Change in fair value of interest rate swap agreements	13,708	13,708				$ 13,708
Adjustment for Noncontrolling Interests ownership in Operating Partnership	0	(8,393)		(8,393)			8,393	8,393
Shareholders' equity, ending balance at Dec. 31, 2016	1,782,318	1,738,451	$ 1,362	$ 1,920,642	(197,261)	$ 13,708	43,867	43,142	725
Increase (Decrease) in Stockholders' Equity
Net (loss) income	$ 31,424	$ 29,981			$ 29,981		$ 1,443	$ 825	$ 618