Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Net Income (Loss) Available to Common Stockholders, Diluted	$ 148,986	$ 123,927
Operating activities:
Net income	166,841	141,782
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Income from discontinued operations	0	(199)
Gain on sale of real estate	(3,885)	(23,829)
Gain on insurance recovery	(3,837)	0
Deferred income tax expense (benefit)	(664)	229
Costs associated with loan refinancing or payoff	905	261
Equity in income from joint ventures	501	701
Distributions from joint ventures	511	0
Depreciation and amortization	79,222	64,702
Amortization of deferred financing costs	3,522	3,425
Amortization of above market leases	138	145
Share-based compensation expense to management and trustees	8,282	6,218
Share-based compensation expense included in retirement severance expense	0	6,377
Decrease (increase) in restricted cash	(1,463)	94
Increase in mortgage notes accrued interest receivable	(188)	(5,465)
Increase in accounts receivable, net	(19,066)	(8,326)
Increase in direct financing lease receivable	(2,503)	(2,708)
Increase in other assets	(5,193)	(2,401)
Decrease in accounts payable and accrued liabilities	(5,260)	(2,694)
Increase (decrease) in unearned rents and interest	(1,088)	7,398
Net operating cash provided by continuing operations	215,773	184,308
Net operating cash provided by discontinued operations	0	514
Net cash provided by operating activities	215,773	184,822
Investing activities:
Acquisition of and investments in rental properties and other assets	177,362	136,029
Proceeds from sale of real estate	20,651	45,992
Investment in mortgage notes receivable	(80,786)	(62,936)
Proceeds from mortgage note receivable paydown	63,876	975
Investment in promissory notes receivable	66	0
Proceeds from sale of infrastructure related to issuance of revenue bonds	43,462	0
Proceeds from insurance recovery	3,036	0
Proceeds from Sale of Lease Receivables	825	4,741
Additions to properties under development	(288,887)	(324,859)
Net cash used by investing activities	(415,251)	(472,116)
Financing activities:
Proceeds from long-term debt facilities	854,360	803,914
Principal payments on long-term debt	(587,109)	(413,069)
Deferred financing fees paid	(3,047)	(6,952)
Costs associated with loan refinancing or payoff (cash portion)	(482)	0
Net proceeds from issuance of common shares	142,452	99,760
Impact of stock option exercises, net	(717)	(3,192)
Purchase of common shares for treasury	(4,211)	(8,222)
Dividends paid to shareholders	(198,678)	(172,926)
Net cash provided by financing activities	202,568	299,313
Effect of exchange rate changes on cash	(62)	(741)
Net increase in cash and cash equivalents	3,028	11,278
Cash and cash equivalents at beginning of the year	4,283	3,336
Cash and cash equivalents at end of the year	7,311	14,614
Supplemental schedule of non-cash activity:
Transfer of property under development to rental property	364,234	307,004
Transfer of land held for development to property under development	0	167,600
Issuance of nonvested shares and restricted share units at fair value, including nonvested shares issued for payment of bonuses	19,626	14,285
Conversion of mortgage note receivable to rental property	0	120,051
Supplemental disclosure of cash flow information:
Cash paid during the year for interest	83,307	76,435
Cash paid during the period for income taxes	1,380	1,286
Interest cost capitalized	7,983	14,265
Increase in accrued capital expenditures	$ 5,621	$ 13,293