Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Net Income (Loss) Available to Common Stockholders, Diluted	$ 47,964	$ 48,228
Operating activities:
Net income	53,916	54,180
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Gain on sale of real estate	(2,004)	0
Deferred income tax expense (benefit)	634	(602)
Costs associated with loan refinancing or payoff	5	552
Equity in (loss) income from joint ventures	(8)	212
Distributions from joint ventures	442	511
Depreciation and amortization	28,077	25,955
Amortization of deferred financing costs	1,456	1,172
Amortization of above market leases, net and tenant improvements	45	48
Share-based compensation expense to management and trustees	3,458	2,765
Increase in restricted cash	(1,786)	(2,221)
Increase in mortgage notes accrued interest receivable	1,098	514
Decrease (increase) in accounts receivable, net	2,720	(2,968)
Increase in direct financing lease receivable	(397)	(840)
Increase in other assets	(3,147)	(2,907)
Decrease in accounts payable and accrued liabilities	(12,492)	(6,878)
Increase in unearned rents and interest	2,738	8
Net cash provided by operating activities	74,771	69,077
Investing activities:
Acquisition of and investments in rental properties and other assets	60,764	36,907
Proceeds from sale of real estate	18,105	1,920
Investment in mortgage notes receivable	(67,057)	(53,659)
Proceeds from mortgage note receivable paydown	8,140	19,496
Investment in promissory notes receivable	554	0
Proceeds from promissory note receivable paydown	1,599	0
Additions to properties under development	(100,184)	(61,765)
Net cash used by investing activities	(200,715)	(130,915)
Financing activities:
Proceeds from long-term debt facilities	175,000	162,000
Principal payments on long-term debt	(45,331)	(148,586)
Deferred financing fees paid	(33)	(36)
Costs associated with loan refinancing or payoff (cash portion)	(1)	(472)
Net proceeds from issuance of common shares	68,141	125,199
Impact of stock option exercises, net	(138)	(635)
Purchase of common shares for treasury	(6,729)	(4,208)
Dividends paid to shareholders	(69,856)	(64,823)
Net cash provided by financing activities	121,053	68,439
Effect of exchange rate changes on cash	2	96
Net (decrease) increase in cash and cash equivalents	(4,889)	6,697
Cash and cash equivalents at beginning of the year	19,335	4,283
Cash and cash equivalents at end of the year	14,446	10,980
Supplemental schedule of non-cash activity:
Transfer of property under development to rental property	63,672	173,877
Issuance of nonvested shares and restricted share units at fair value, including nonvested shares issued for payment of bonuses	21,698	18,505
Supplemental disclosure of cash flow information:
Cash paid during the year for interest	41,030	34,257
Cash paid during the period for income taxes	317	418
Interest cost capitalized	2,791	2,291
Decrease in accrued capital expenditures	$ (5,506)	$ (7,320)