Segments - Reconciliation of Net Operating Income to Net Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Net operating income	$ 6,710	$ 6,625	$ 12,709	$ 11,920
Depreciation and amortization	(8,602)	(5,766)	(16,751)	(10,674)
General and administrative expenses	(2,224)	(2,096)	(4,708)	(4,424)
Acquisition, development and other pursuit costs	(437)	(591)	(1,141)	(762)
Impairment charges	0	(23)	(35)	(23)
Interest income	722	0	904	0
Interest expense	(3,978)	(3,358)	(7,769)	(6,404)
Loss on extinguishment of debt	0	(180)	0	(407)
Gain on real estate dispositions	13	7,210	26,687	13,407
Change in fair value of interest rate derivatives	(373)	(40)	(2,762)	(187)
Other (expense) income	43	24	119	39
Income tax benefit (provision)	(6)	4	(224)	35
Net income	3,131	10,285	29,664	18,403
Operating Segments
Net operating income	17,973	15,101	35,344	27,803
Segment Reconciling Items
Depreciation and amortization	(8,602)	(5,766)	(16,751)	(10,674)
General and administrative expenses	(2,224)	(2,096)	(4,708)	(4,424)
Acquisition, development and other pursuit costs	(437)	(591)	(1,141)	(762)
Impairment charges	0	(23)	(35)	(23)
Interest income	722	0	904	0
Interest expense	(3,978)	(3,358)	(7,769)	(6,404)
Loss on extinguishment of debt	0	(180)	0	(407)
Gain on real estate dispositions	13	7,210	26,687	13,407
Change in fair value of interest rate derivatives	(373)	0	(2,762)	0
Other (expense) income	43	(16)	119	(148)
Income tax benefit (provision)	$ (6)	$ 4	$ (224)	$ 35