Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended				6 Months Ended		12 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019
Cash flows from operating activities:
Net income	$ 10,444	$ 14,043	$ 10,571	$ 8,723	$ 24,488	$ 19,294
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization					26,476	19,225
Amortization of lease incentive					969	132
Amortization of above/below market leases and right of use assets, net					597	309
Amortization of deferred financing costs and other assets					1,282	1,527
Loss on repayment and repurchase of secured borrowings	0		4,353		924	4,353
Provision for impairment of real estate	1,486		481		1,859	1,921
Provision for loan losses	48		0		516	0
Gain on dispositions of investments, net					(2,968)	(4,150)
Straight-line rent receivable					(3,099)	(5,898)
Share and unit based compensation expense					3,348	2,473
Adjustment to rental revenue for tenant credit					(2,063)	25
Changes in other assets and liabilities:
Rent receivables, prepaid expenses and other assets					(11,816)	(3,035)
Accrued liabilities and other payables					(4,059)	(339)
Net cash provided by operating activities					36,454	35,837
Cash flows from investing activities:
Proceeds from sales of investments, net					22,964	32,227
Principal collections on loans and direct financing lease receivables					130	4,664
Investments in loans receivable					(9,656)	(23,566)
Deposits for prospective real estate investments					1,970	1,618
Investment in real estate, including capital expenditures					(190,365)	(272,364)
Investment in construction in progress					(9,706)	(5,754)
Lease incentives paid					(7,703)	(2,000)
Net cash used in investing activities					(192,366)	(265,175)
Cash flows from financing activities:
Repayments of secured borrowings					(63,943)	(3,954)
Repurchase of secured borrowings					0	(201,400)
Principal received on repurchased secured borrowings					0	564
Borrowings under term loan facilities					180,000	200,000
Borrowings under revolving credit facility					69,000	119,000
Repayments under revolving credit facility					(115,000)	(86,000)
Proceeds from issuance of common stock, net					215,275	235,704
Deferred financing costs					0	(2,471)
Offering costs					(545)	(1,066)
Dividends paid					(40,690)	(29,334)
Net cash provided by financing activities					244,097	231,043
Net increase in cash and cash equivalents and restricted cash					88,185	1,705
Cash and cash equivalents and restricted cash, beginning of period		21,319		16,239	21,319	16,239	$ 16,239
Cash and cash equivalents and restricted cash, end of period	109,504		17,944		109,504	17,944	21,319
Reconciliation of cash and cash equivalents and restricted cash:
Cash and cash equivalents								$ 100,839	$ 8,304	$ 7,816
Restricted cash								8,665	13,015	10,128
Cash and cash equivalents and restricted cash, end of period	$ 109,504	$ 21,319	$ 17,944	$ 16,239	109,504	17,944	$ 16,239	109,504	21,319	17,944
Supplemental disclosure of cash flow information:
Cash paid for interest, net of amounts capitalized					12,772	14,266
Cash paid for income taxes					52	0
Non-cash operating, investing and financing activities:
Adjustment upon adoption of ASC 326					188	0
Reclassification from construction in progress upon project completion					10,869	4,960
Non-cash investments in real estate and loan receivable activity					0	5,748
Lease liabilities arising from the recognition of right of use assets					0	4,822
Unrealized losses on cash flow hedges					44,891	3,873
Payable and accrued offering costs					191	0
Discounts and fees on capital raised through issuance of common stock					8,468	9,821
Payable and accrued deferred financing costs					$ 0	$ 0
Dividend payable								$ 21,545	$ 19,395	$ 16,917