Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net earnings	$ 36,015	$ 34,516
Adjustments to reconcile net earnings to net cash flow provided by operating activities:
Depreciation and amortization expense	18,571	17,569
Impairment charges	2,400	4,808
(Gain) loss on dispositions of real estate	(376)	(3,636)
Deferred rent receivable	(2,634)	(3,214)
Allowance for doubtful accounts	74	364
Amortization of above-market and below-market leases	(494)	(624)
Amortization of investment in direct financing leases	2,587	2,210
Amortization of debt issuance costs	710	636
Accretion expense	1,507	1,837
Stock-based compensation	1,803	1,309
Changes in assets and liabilities:
Accounts receivable	(337)	(392)
Prepaid expenses and other assets	(299)	(383)
Environmental remediation obligations	(6,135)	(7,516)
Accounts payable and accrued liabilities	4,602	1,213
Net cash flow provided by operating activities	57,994	48,697
CASH FLOWS FROM INVESTING ACTIVITIES:
Property acquisitions	(43,324)	(74,714)
Capital expenditures	(13)	(878)
Addition to construction in progress	(358)	(2,050)
Proceeds from dispositions of real estate	592	1,641
Deposits for property acquisitions	305	(300)
(Issuance) of notes and mortgages receivable	(464)	(242)
Collection of notes and mortgages receivable	4,226	2,855
Net cash flow (used in) investing activities	(39,036)	(73,688)
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings under credit agreement	35,000	70,000
Repayments under credit agreement	(155,000)	(125,000)
Proceeds from senior unsecured notes	125,000	100,000
Payment of debt issuance costs	(556)	(3,393)
Payment of finance lease obligations	(398)	(344)
Security deposits received (refunded)	(271)	(51)
Payments of cash dividends	(42,596)	(37,681)
Payments in settlement of restricted stock units	(115)
Net cash flow (used in) provided by financing activities	(30,119)	24,183
Change in cash, cash equivalents and restricted cash	(11,161)	(808)
Cash, cash equivalents and restricted cash at beginning of period	48,742	20,813
Cash, cash equivalents and restricted cash at end of period	37,581	20,005
Supplemental disclosures of cash flow information Cash paid during the period for:
Interest	17,369	15,360
Income taxes	273	224
Environmental remediation obligations	5,280	6,836
Non-cash transactions:
Dividends declared but not yet paid	14,662	13,145
Issuance of notes and mortgages receivable related to property dispositions	926	3,313
ATM Program [Member]
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock, net	$ 8,817	$ 20,652