Consolidated Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
CASH FLOWS FROM OPERATING ACTIVITIES:
Net earnings	$ 27,606,000	$ 49,429,000
Adjustments to reconcile net earnings to net cash flow provided by operating activities:
Depreciation and amortization expense	21,292,000	19,552,000
Impairment charges	2,984,000	1,429,000
Gain on dispositions of real estate	(903,000)	(7,302,000)
Loss on extinguishment of debt	43,000
Deferred rent receivable	(2,475,000)	(1,582,000)
Amortization of above-market and below-market leases	(2,000)	9,000
Amortization of investment in direct financing leases	2,923,000	2,598,000
Amortization of debt issuance costs	503,000	468,000
Accretion expense	278,000	822,000
Stock-based compensation	2,719,000	2,316,000
Changes in assets and liabilities:
Accounts receivable	(114,000)	(180,000)
Prepaid expenses and other assets	(2,364,000)	(1,047,000)
Environmental remediation obligations	(2,198,000)	(19,867,000)
Accounts payable and accrued liabilities	(1,766,000)	(3,236,000)
Net cash flow provided by operating activities	48,526,000	43,409,000
CASH FLOWS FROM INVESTING ACTIVITIES:
Property acquisitions	(73,260,000)	(54,198,000)
Capital expenditures	(141,000)
Addition to construction in progress	(129,000)	(33,000)
Proceeds from dispositions of real estate	2,634,000	10,698,000
Deposits for property acquisitions	7,675,000
Issuance of notes and mortgages receivable	(41,600,000)	(4,825,000)
Collection of notes and mortgages receivable	5,441,000	721,000
Net cash flow used in investing activities	(99,380,000)	(47,637,000)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings under credit agreement	43,500,000	15,000,000
Repayments under credit agreement	(113,500,000)	(75,000,000)
Proceeds from senior unsecured notes	125,000,000	100,000,000
Repayments under senior unsecured notes	(75,043,000)
Payment of debt issuance costs	(414,000)	(588,000)
Payment of finance lease obligations	(164,000)	(230,000)
Security deposits refunded	(1,136,000)	(47,000)
Payments of cash dividends	(41,517,000)	(39,055,000)
Payments in settlement of restricted stock units	(1,002,000)	(496,000)
Net cash flow provided by (used in) financing activities	49,840,000	(499,000)
Change in cash, cash equivalents and restricted cash	(1,014,000)	(4,727,000)
Cash, cash equivalents and restricted cash at beginning of period	11,249,000	26,461,000
Cash, cash equivalents and restricted cash at end of period	10,235,000	21,734,000
Supplemental disclosures of cash flow information Cash paid during the period for:
Interest	14,245,000	12,813,000
Income taxes	563,000	631,000
Environmental remediation obligations	2,120,000	2,333,000
Non-cash transactions:
Dividends declared but not yet paid	22,262,000	19,619,000
Issuance of notes and mortgages receivable related to property dispositions		1,050,000
ATM Program [Member]
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock, net	$ 114,116,000	$ (83,000)