Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating activities:
Net income	$ 176,229	$ 98,606	$ (131,728)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
asset impairment charges cont and discops	27,349	2,711	85,657
Impairment Losses Related to Real Estate Partnerships	647	0	3,247
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property	651	17,881	50,119
Gain on insurance recovery	(552)	(1,181)	(809)
Deferred income tax benefit (expense)	(169)	0	15,246
Financing Receivable, Credit Loss, Expense (Reversal)	10,816	(21,972)	30,695
write off of deferred debt issuance cost cont and disc	0	25,451	1,632
Equity in loss from joint ventures	1,672	5,059	4,552
Distributions from joint ventures	780	90	0
depreciation and amort cont and discops	163,652	163,770	170,333
Amortization of deferred financing costs	8,360	7,666	6,606
Amortization of above/below market leases and tenant allowances, net	(355)	(385)	(480)
Share-based compensation expense to management and trustees	16,666	14,903	13,819
Share-based compensation expense included in severance expense	0	0	1,258
Increase (Decrease) in Operating Lease Assets and Liabilities, Net	463	(551)	344
Mortgage notes accrued interest receivable	(500)	568	(7,576)
Accounts receivable	25,974	36,821	(47,383)
Other assets	(473)	(1,282)	(2,698)
Accounts payable and accrued liabilities	14,576	(8,653)	(16,128)
Increase (Decrease) in Deferred Revenue	(2,768)	3,185	(11,195)
Net cash provided by operating activities	441,716	306,925	65,273
Investing activities:
Acquisition of rental properties and other assets	(174,533)	(56,556)	(38,714)
Proceeds from Sale of Real Estate	10,965	96,137	227,742
Investment in unconsolidated joint ventures	26,088	13,611	1,690
Proceeds from Equity Method Investment, Distribution, Return of Capital	6,695	0	0
Payments for (Proceeds from) Hedge, Investing Activities	(3,830)	0	0
Investment in mortgage notes receivable	(95,234)	(8,664)	(8,141)
Proceeds from mortgage note receivable paydown	1,749	8,242	481
Investment in promissory notes receivable	0	4,379	6,134
Proceeds from promissory note receivable paydown	701	8,816	103
Proceeds from insurance recovery	3,700	1,181	809
Additions to properties under development	(75,710)	(29,304)	(40,470)
Net cash (used) provided by investing activities	(351,585)	1,862	133,986
Financing activities:
Proceeds from Issuance of Long-term Debt	0	400,000	750,000
Principal payments on long-term debt	0	(1,288,765)	(160,000)
Deferred financing fees paid	(328)	(15,212)	(6,330)
Costs associated with loan refinancing or payoff (cash portion)	0	(22,865)	(1,632)
Net proceeds from issuance of common shares	758	460	972
Payment, Tax Withholding, Share-based Payment Arrangement	(11)	(2)	0
Issuances of captive REIT preferred shares	107	0	0
Purchase of common shares for treasury	(4,257)	(2,763)	(7,387)
payments for repurchase of common stock, repurchase program	0	0	105,994
Dividends paid to shareholders	(265,661)	(117,531)	(172,460)
Net cash (used) provided by financing activities	(269,392)	(1,046,678)	297,169
Effect of Exchange Rate on Cash	(129)	(218)	142
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	(179,390)	(738,109)	496,570
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	110,511	289,901	1,028,010
Restricted Cash and Cash Equivalents	2,577	1,079	2,433
Cash and cash equivalents at beginning of the year	288,822	1,025,577	528,763
Cash and cash equivalents at end of the year	107,934	288,822	1,025,577
Supplemental schedule of non-cash activity:
Transfer of property under development to rental property	41,872	91,546	20,657
Issuance of nonvested shares and restricted share units at fair value, including nonvested shares issued for payment of bonuses	21,751	21,921	20,062
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	36,741	33,355	0
Supplemental disclosure of cash flow information:
Interest Paid, Excluding Capitalized Interest, Operating Activities	125,808	150,034	152,393
Cash paid during the year for income taxes	1,282	1,466	1,507
Interest cost capitalized	1,286	1,567	1,233
Change in accrued capital expenditures	$ 896	$ 2,880	$ (12,376)