Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Net Income (Loss) Available to Common Stockholders, Diluted	$ 97,411	$ 79,683
Operating activities:
Net income	109,315	91,587
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Income from discontinued operations	0	(58)
Gain on sale of real estate	(2,270)	(23,924)
Gain on insurance recovery	(2,012)	0
Deferred income tax expense (benefit)	(620)	177
Costs associated with loan refinancing or payoff	891	243
Equity in income from joint ventures	298	362
Distributions from joint ventures	511	0
Depreciation and amortization	51,621	41,204
Amortization of deferred financing costs	2,335	2,269
Amortization of above market leases	96	97
Share-based compensation expense to management and trustees	5,504	4,057
Share-based compensation expense included in retirement severance expense	0	6,377
Decrease (increase) in restricted cash	(1,665)	464
Decrease (increase) in mortgage notes accrued interest receivable	728	(3,009)
Increase in accounts receivable, net	(4,327)	(9,314)
Increase in direct financing lease receivable	(1,736)	(1,882)
Increase in other assets	(4,745)	(2,057)
Increase (decrease) in accounts payable and accrued liabilities	(931)	6,035
Increase in unearned rents and interest	135	7,977
Net operating cash provided by continuing operations	152,532	119,881
Net operating cash provided by discontinued operations	0	526
Net cash provided by operating activities	152,532	120,407
Investing activities:
Acquisition of and investments in rental properties and other assets	138,788	93,221
Proceeds from sale of real estate	13,129	43,790
Investment in mortgage notes receivable	(65,508)	(35,589)
Proceeds from mortgage note receivable paydown	63,685	308
Proceeds from sale of infrastructure related to issuance of revenue bonds	43,462	0
Proceeds from insurance recovery	2,211	0
Proceeds from Sale of Lease Receivables	825	4,741
Additions to properties under development	(187,216)	(206,955)
Net cash used by investing activities	(268,200)	(286,926)
Financing activities:
Proceeds from long-term debt facilities	318,000	558,914
Principal payments on long-term debt	(203,116)	(259,659)
Deferred financing fees paid	(169)	(6,854)
Costs associated with loan refinancing or payoff (cash portion)	(472)	0
Net proceeds from issuance of common shares	142,279	240
Impact of stock option exercises, net	(717)	(35)
Purchase of common shares for treasury	(4,208)	(8,223)
Dividends paid to shareholders	(131,701)	(114,600)
Net cash provided by financing activities	119,896	169,783
Effect of exchange rate changes on cash	(49)	(454)
Net increase in cash and cash equivalents	4,179	2,810
Cash and cash equivalents at beginning of the year	4,283	3,336
Cash and cash equivalents at end of the year	8,462	6,146
Supplemental schedule of non-cash activity:
Transfer of property under development to rental property	224,057	62,028
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	13,682
Supplemental disclosure of cash flow information:
Cash paid during the year for interest	48,608	42,143
Cash paid during the period for income taxes	1,116	748
Interest cost capitalized	5,051	9,493
Decrease in accrued capital expenditures	$ (5,598)	$ (5,967)