Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Net Income (Loss) Available to Common Stockholders, Diluted	$ 123,927	$ 109,141
Operating activities:
Net income	141,782	126,997
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Provision for loan loss	0	3,777
Income from discontinued operations	(199)	(3,384)
Gain on sale of real estate	(23,829)	(330)
Deferred income tax expense	229	1,612
gain on sale of investment in a direct financing lease	0	220
Costs associated with loan refinancing or payoff	261	0
Equity in income from joint ventures	701	878
Distributions from joint ventures	0	810
Depreciation and amortization	64,702	48,750
Amortization of deferred financing costs	3,425	3,158
Amortization of above and below Market Leases	145	144
Share-based compensation expense to management and trustees	6,218	6,984
Share-based compensation expense included in retirement severance expense	6,377	0
Decrease (increase) in restricted cash	94	(1,490)
Increase in mortgage notes accrued interest receivable	(5,465)	(2,323)
Increase in accounts receivable, net	(8,326)	(2,585)
Increase in direct financing lease receivable	(2,708)	(2,211)
Increase in other assets	(2,401)	(4,025)
Decrease in accounts payable and accrued liabilities	(2,694)	(8,095)
Increase in unearned rents and interest	7,398	1,408
Net operating cash provided by continuing operations	184,308	168,099
Net operating cash provided by discontinued operations	514	109
Net cash provided by operating activities	184,822	168,208
Investing activities:
Acquisition of rental properties and other assets	136,029	56,385
Proceeds from sale of real estate	45,992	3,647
Proceeds from settlement of derivative	0	(5,725)
Investment in mortgage notes receivable	(62,936)	(57,922)
Proceeds from mortgage note receivable paydown	975	317
Investment in promissory notes receivable	0	4,387
Proceeds from Sale of Lease Receivables	4,741	46,092
Additions to properties under development	(324,859)	(256,528)
Net cash used by investing activities	(472,116)	(319,441)
Financing activities:
Proceeds from long-term debt facilities	803,914	265,000
Principal payments on long-term debt	(413,069)	(220,566)
Deferred financing fees paid	(6,952)	(808)
Net proceeds from issuance of common shares	99,760	264,008
Impact of stock option exercises, net	(3,192)	(27)
Purchase of common shares for treasury	(8,222)	(2,892)
Dividends paid to shareholders	(172,926)	(152,874)
Net cash provided by financing activities	299,313	151,841
Effect of exchange rate changes on cash	(741)	(180)
Net increase in cash and cash equivalents	11,278	428
Cash and cash equivalents at beginning of the year	3,336	7,958
Cash and cash equivalents at end of the year	14,614	8,386
Supplemental schedule of non-cash activity:
Transfer of property under development to rental property	307,004	152,504
Transfer of land held for development to property under development	167,600	0
Acquisition of real estate in exchange for assumption of debt at fair value	0	101,441
Issuance of nonvested shares and restricted share units at fair value, including nonvested shares issued for payment of bonuses	14,285	15,525
Conversion of mortgage note receivable to rental property	120,051	0
Supplemental disclosure of cash flow information:
Cash paid during the year for interest	76,435	76,836
Cash paid during the period for income taxes	1,286	234
Interest cost capitalized	14,265	4,982
Increase in accrued capital expenditures	$ 13,293	$ 11,385