Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES:
Net earnings	$ 60,151	$ 90,043	$ 62,860
Adjustments to reconcile net earnings to net cash flow provided by operating activities:
Depreciation and amortization expense	45,296	39,902	35,518
Impairment charges	5,243	3,545	4,404
Gains on dispositions of real estate	(4,625)	(16,423)	(16,718)
Loss on extinguishment of debt	43
Deferred rent receivable	(4,033)	(3,458)	(2,778)
Allowance for credit loss on notes and mortgages receivable and direct financing leases	(189)	50	(132)
Amortization of above-market and below-market leases	41	14	(71)
Amortization of investment in direct financing leases	6,004	5,392	4,846
Amortization of debt issuance costs	1,211	946	1,013
Accretion expense	585	1,259	1,705
Stock-based compensation expense	5,582	4,775	3,997
Changes in assets and liabilities:
Accounts receivable	(1,098)	(784)	60
Prepaid expenses and other assets	(2,285)	(1,965)	(997)
Environmental remediation obligations	(6,157)	(28,088)	(6,335)
Accounts payable and accrued liabilities	(471)	(2,122)	(554)
Net cash flow provided by operating activities	105,298	93,086	86,818
CASH FLOWS FROM INVESTING ACTIVITIES:
Property acquisitions	(248,072)	(137,275)	(194,292)
Capital expenditures	(309)		(271)
Addition to construction in progress	(349)	(56)	(312)
Proceeds from dispositions of real estate	11,201	24,204	24,796
Deposits for property acquisitions	3,930	(8,265)	3,298
Issuance of notes and mortgages receivable	(119,268)	(19,312)	(13,515)
Collection of notes and mortgages receivable	42,162	1,648	10,564
Net cash flow used in investing activities	(310,705)	(139,056)	(169,732)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings from Revolving Credit Facility	230,500	90,000	175,000
Repayments of Revolving Credit Facility	(290,500)	(80,000)	(140,000)
Proceeds from Senior Unsecured Notes	125,000	100,000
Proceeds from Term Loan	75,000
Repayments of Senior Unsecured Notes	(75,043)
Payments of finance lease liability	(297)	(487)	(645)
Payments of cash dividends	(86,964)	(78,264)	(70,770)
Payments of debt issuance costs	(2,932)	(611)	(2,586)
Security deposits refunded	(547)	823	(233)
Payments in settlement of restricted stock units	(1,004)	(496)	(730)
Proceeds from issuance of common stock, net - equity offering	112,128
Proceeds from issuance of common stock, net - ATM Program	114,103	(207)	92,285
Net cash flow provided by financing activities	199,444	30,758	52,321
Change in cash, cash equivalents and restricted cash	(5,963)	(15,212)	(30,593)
Cash, cash equivalents and restricted cash at beginning of year	11,249	26,461	57,054
Cash, cash equivalents and restricted cash at end of year	5,286	11,249	26,461
Supplemental disclosures of cash flow information Cash paid during the period for:
Interest	29,379	26,526	23,690
Income taxes	677	557	355
Environmental remediation obligations	5,856	4,252	4,568
Non-cash transactions
Dividends declared but not yet paid	$ 24,850	20,576	19,467
Issuance of notes and mortgages receivable related to property dispositions		$ 1,050	$ 428