Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating activities
Net income	$ 9,506	$ 24,152	$ 11,316
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	19,517	17,617	17,921
Stock-based compensation	3,405	3,387	2,555
Straight-line rent receivable	(936)	(5,919)	3,447
Straight-line rent liability	149	157	165
Provision for bad debt			216
Construction mortgage interest income	(1,186)	(22)
Write-off of pre-acquisitions costs	513	149	252
Write-off of pre-offering costs			89
Changes in operating assets and liabilities
Other assets	(7,210)	10,264	(12,939)
Accounts payable and accrued liabilities	796	(9,147)	9,062
Deferred revenues	(1,088)	503	(1,632)
Net cash provided by operating activities	23,466	41,141	30,452
Investing activities
Acquisitions of real estate	(23,458)	(55,179)	(72)
Capital expenditures for real estate	(3,931)	(1,105)
Funding of mortgage notes and note receivable, net	(39,715)	(21,113)	(1,662)
Repayments of mortgage notes and notes receivable	1,349	450	1,712
Capitalized pre-acquisition costs, net	(210)	(107)	(306)
Capital expenditures for corporate property	(24)	(15)	(12)
Net cash used in investing activities	(65,989)	(77,069)	(340)
Financing activities
Net borrowings (repayments) on secured credit facility	62,600	(52,800)	(103,400)
Dividends paid to common stockholders	(20,097)	(26,657)	(10,459)
Distributions to noncontrolling interest	(2,934)	(3,239)	(2,307)
Deferred loan costs	(901)	(2,910)	(1,402)
Taxes remitted upon vesting of restricted stock	(397)	(224)
Capitalized pre-offering costs	(18)	(280)
Proceeds from borrowings on term loan		125,000
Cancellation of restricted stock		(50)
Proceeds from sale of common shares, net of offering costs		(43)	224,320
Redemption of preferred shares			(125,125)
Dividends paid to preferred stockholders			(14,588)
Net cash provided by (used in) financing activities	38,253	38,797	(32,961)
Increase (decrease) in cash, cash equivalents and restricted cash	(4,270)	2,869	(2,849)
Cash, cash equivalents and restricted cash at beginning of period	12,640	9,771	12,620
Cash, cash equivalents and restricted cash at end of period	8,370	12,640	9,771
Supplemental Cash Flow Information
Interest paid	11,181	6,325	8,417
Norris Academy acquisition of real estate	6,383
Norris Academy mortgage note conversion	(6,383)
Accrued capital expenditures for real estate	613
Texas gross margins taxes paid, net of reimbursement	96	(23)	69
Accrued pre-acquisition costs	$ 34	64	$ 21
Accrued pre-offering costs		$ 18