Consolidated Statements Of Cash Flows - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018
Operating activities:
Net income		$ 165,946	$ 212,952
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Asset Impairment Charges		0	16,548
Gain on sale of real estate		(30,405)	(2,688)
Deferred income tax (benefit) expense		(3,268)	755
gain on sale of investment in a direct financing lease		0	5,514
Costs associated with loan refinancing or payoff		38,407	31,958
Equity in (income) loss from joint ventures		524	(17)
Proceeds from Equity Method Investment, Distribution		112	567
Depreciation and amortization		127,232	113,889
Amortization of deferred financing costs		4,571	4,307
Amortization of above/below market leases and tenant allowances, net		(224)	(527)
Share-based compensation expense to management and trustees		9,832	11,295
Share-based payment arrangement, noncash expense included in severance		521	0
Increase (Decrease) in Operating Lease Assets and Liabilities, Net		1,033	0
Mortgage notes accrued interest receivable		(389)	(970)
Accounts receivable		12,935	(13,620)
Increase in direct financing lease receivable		(169)	(500)
Other assets		(3,189)	(2,717)
Accounts payable and accrued liabilities		5,689	11,244
Increase (Decrease) in Deferred Revenue		9,152	23,886
Net cash provided by operating activities		337,262	400,882
Investing activities:
Acquisition of and investments in real estate and other assets		443,561	107,396
Proceeds from sale of real estate		182,719	19,881
Investment in unconsolidated joint ventures		325	0
Payments for (Proceeds from) Hedge, Investing Activities		0	(30,796)
Investment in mortgage notes receivable		(98,071)	(27,719)
Proceeds from Sale and Collection of Mortgage Notes Receivable		207,125	272,004
Investment in promissory notes receivable		10,639	7,801
Proceeds from promissory note receivable paydown		3,637	7,500
Proceeds from Sale of Lease Receivables		0	43,447
Additions to properties under development		(125,635)	(222,840)
Net cash (used) provided by investing activities		(284,750)	7,872
Financing activities:
Proceeds from long-term debt facilities		962,000	870,000
Principal payments on long-term debt		(866,735)	(941,684)
Deferred financing fees paid		(9,343)	(8,643)
Costs associated with loan refinancing or payoff (cash portion)		(36,918)	(28,650)
Net proceeds from issuance of common shares		285,269	734
Payment, Tax Withholding, Share-based Payment Arrangement		(732)	(6)
Purchase of common shares for treasury		(9,691)	(7,155)
Dividends paid to shareholders		(273,187)	(256,074)
Net cash provided (used) by financing activities		50,663	(371,478)
Effect of exchange rate changes on cash		86	(78)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect		103,261	37,198
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents		121,768	96,184
Cash and Cash Equivalents, at Carrying Value		115,839	74,153
Restricted Cash and Cash Equivalents		5,929	22,031
Supplemental schedule of non-cash activity:
Transfer of property under development to rental property		353,947	175,198
Issuance of nonvested shares and restricted share units at fair value, including nonvested shares issued for payment of bonuses		17,590	18,252
Noncash or Part Noncash Acquisition, Value of Assets Acquired		0	155,185
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability		229,620	0
Operating Lease, Cost		253,486	0
Straight-Line Rent Receivable	[1]	89,361
Other Real Estate, Additions		14,000	0
Noncash or Part Noncash Acquisition, Debt Assumed		18,585	0
Supplemental disclosure of cash flow information:
Interest Paid, Excluding Capitalized Interest, Operating Activities		101,982	104,065
Cash paid during the period for income taxes		1,332	1,365
Interest cost capitalized		5,053	7,235
Change in accrued capital expenditures		$ (2,247)	$ (6,165)

[1] At September 30, 2019, includes $25.2 million in sub-lessor straight-line rent receivables. Sub-lessor straight-line receivables relate to the Company's operating ground leases. The Company's tenants, who are generally sub-tenants under these ground leases, are responsible for paying the rent under these leases. See Note 16 for information related to the Company's leases.