Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Proceeds from settlement of derivative	$ (5,725)	$ 0
Net Income (Loss) Available to Common Stockholders, Diluted	37,581	35,254
Net Income Loss From Discontinuing Operation Available To Common Stockholders Diluted	3,391	330
Net Income Loss From Continuing Operation Available To Common Stockholders Diluted	34,190	34,924
Operating activities:
Net income	43,533	41,206
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Gain on early extinguishment of debt	0	(4,539)
Income from discontinued operations	(3,391)	(330)
Gain on sale of land	(330)	0
Equity in income from joint ventures	311	351
Distributions from joint ventures	0	223
Depreciation and amortization	15,327	12,822
Amortization of deferred financing costs	1,015	999
Amortization of above and below Market Leases	48	0
Share-based compensation expense to management and trustees	2,328	1,548
Decrease (increase) in restricted cash	(3,425)	2,946
Increase in mortgage notes accrued interest receivable	(107)	(36)
Decrease (increase) in accounts receivable, net	371	(1,309)
Increase in direct financing lease receivable	(694)	(1,212)
Decrease (increase) in other assets	(2,039)	76
Decrease in accounts payable and accrued liabilities	(14,712)	(10,460)
Increase (decrease) in unearned rents and interest	3,793	(3,072)
Net operating cash provided by continuing operations	41,406	38,511
Net operating cash provided by discontinued operations	124	1,661
Net cash provided by operating activities	41,530	40,172
Investing activities:
Payments to Acquire Real Estate	12,264	8,174
Proceeds from sale of real estate	915	0
Investment in unconsolidated joint ventures	0	(433)
Investment in mortgage notes receivable	(4,472)	(12,769)
Proceeds from mortgage note receivable paydown	76	0
Investment in promissory notes receivable	2,207	0
Additions to properties under development	(50,621)	(17,719)
Net cash used by investing activities of continuing operations	(62,848)	(39,095)
Net proceeds from sale of real estate from discontinued operations	0	24,146
Net cash used by investing activities	(62,848)	(14,949)
Financing activities:
Proceeds from long-term debt facilities	47,000	70,000
Principal payments on long-term debt	(39,728)	(48,950)
Deferred financing fees paid	(449)	(67)
Net proceeds from issuance of common shares	79,579	84
Impact of stock option exercises, net	(21)	(692)
Purchase of common shares for treasury	(2,892)	(3,245)
Dividends paid to shareholders	(49,638)	(41,146)
Net cash provided (used) by financing activities	33,851	(24,016)
Effect of exchange rate changes on cash	(85)	(108)
Net increase in cash and cash equivalents	12,448	1,099
Cash and cash equivalents at beginning of the year	7,958	10,664
Cash and cash equivalents at end of the year	20,406	11,763
Supplemental schedule of non-cash activity:
Transfer of property under development to rental property	243	7,151
Issuance of nonvested shares and restricted share units at fair value, including nonvested shares issued for payment of bonuses	14,470	9,373
Supplemental disclosure of cash flow information:
Cash paid during the year for interest	34,384	29,352
Cash received during the year for income taxes	$ 355	$ 221