Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
OPERATING ACTIVITIES
Net income	$ 66,659	$ 72,195	$ 39,185
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	202,714	190,435	177,859
Other amortization	3,793	4,381	3,013
Share-based compensation	10,729	9,922	12,275
Amortization of straight-line rent receivable (lessor)	(5,801)	(3,735)	(3,000)
Amortization of straight-line rent on operating leases (lessee)	1,498	1,490	1,537
Gain on sales of real estate properties	(55,940)	(70,361)	(25,101)
Loss on extinguishment of debt		21,503
Impairment of real estate properties	17,101		5,617
Equity loss from unconsolidated joint ventures	795	463	19
Distributions from unconsolidated joint ventures	0	193	381
Proceeds from disposition of sales-type lease properties		244,454
Non-cash interest from financing receivable	(391)	0	0
Changes in operating assets and liabilities:
Other assets, including right-of-use-assets	(11,436)	(727)	(8,573)
Accounts payable and accrued liabilities	(839)	4,555	2,752
Other liabilities	3,747	(4,679)	7,174
Net cash provided by operating activities	232,629	470,089	213,138
INVESTING ACTIVITIES
Acquisitions of real estate	(365,943)	(397,349)	(380,274)
Development of real estate	(4,029)	(3,089)	(25,985)
Additional long-lived assets	(100,689)	(93,963)	(64,670)
Investments in unconsolidated joint ventures	(89,600)	(65,663)
Investment in financing receivable	(186,433)	0	0
Proceeds from sales of real estate properties	184,221	4,898	52,401
Net cash used in investing activities	(562,473)	(555,166)	(418,528)
FINANCING ACTIVITIES
Net borrowings (repayments) on unsecured credit facility	210,000	(293,000)	31,000
Borrowings on term loan	0	150,000	50,000
Borrowings of notes and bonds payable		596,562
Repayments of notes and bonds payable	(24,557)	(47,845)	(13,857)
Redemption of notes and bonds payable		(270,386)
Dividends paid	(175,456)	(162,557)	(155,358)
Net proceeds from issuance of common stock	331,119	142,000	295,946
Common stock redemptions	(3,803)	(1,436)	(5,097)
Settlement of treasury rate locks	0	(4,267)	0
Debt issuance and assumption costs	(405)	(5,931)	(4,589)
Payments made on finance leases	(9,182)	(3,417)	(379)
Net cash provided by financing activities	327,716	99,723	197,666
(Decrease) increase in cash and cash equivalents	(2,128)	14,646	(7,724)
Cash and cash equivalents cash at beginning of period	15,303	657	8,381
Cash and cash equivalents at end of period	13,175	15,303	657
Supplemental Cash Flow Information
Interest paid	49,443	52,787	53,978
Mortgage notes payable assumed upon acquisition (adjusted to fair value)	11,790	36,536	0
Invoices accrued for construction, tenant improvements and other capitalized costs	17,655	14,935	17,294
Capitalized interest	$ 221	$ 1,142	$ 1,411