Segments - Reconciliation of Net Operating Income to Net Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Depreciation and amortization	$ (9,904)	$ (9,278)
General and administrative expenses	(3,401)	(2,961)
Acquisition, development, and other pursuit costs	(400)	(84)
Interest income	5,319	2,232
Interest expense	(5,886)	(4,373)
Equity in income of unconsolidated real estate entities	273	0
Change in fair value of interest rate derivatives	(1,463)	969
Other income	60	114
Income tax benefit	110	266
Net income	6,514	6,983
Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Gross profit	21,806	20,098
Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Depreciation and amortization	(9,904)	(9,278)
General and administrative expenses	(3,401)	(2,961)
Acquisition, development, and other pursuit costs	(400)	(84)
Interest expense	(5,886)	(4,373)
Equity in income of unconsolidated real estate entities	273	0
Change in fair value of interest rate derivatives	(1,463)	969
Other income	60	114
Income tax benefit	$ 110	$ 266