Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
REVENUE
Rental income	$ 153,769	$ 141,796	$ 306,988	$ 282,457
Other property income	2,915	4,478	6,183	8,840
Mortgage interest income	1,263	1,286	2,528	2,552
Total revenue	157,947	147,560	315,699	293,849
EXPENSES
Rental expenses	28,229	26,906	57,744	53,016
Real estate taxes	17,650	16,537	35,301	32,594
General and administrative	8,302	7,139	15,359	14,143
Depreciation and amortization	39,853	35,199	80,477	71,770
Total operating expenses	94,034	85,781	188,881	171,523
OPERATING INCOME	63,913	61,779	126,818	122,326
Other interest income	64	112	94	319
Interest expense	(27,147)	(28,733)	(54,552)	(57,526)
Early extinguishment of debt	(3,399)	0	(3,399)	0
Income from real estate partnerships	372	438	684	739
INCOME FROM CONTINUING OPERATIONS	33,803	33,596	69,645	65,858
Gain on sale of real estate	4,994	0	4,994	11,860
NET INCOME	38,797	33,596	74,639	77,718
Net income attributable to noncontrolling interests	(1,258)	(993)	(2,512)	(2,129)
NET INCOME ATTRIBUTABLE TO THE TRUST	37,539	32,603	72,127	75,589
Dividends on preferred shares	(135)	(135)	(271)	(271)
NET INCOME AVAILABLE FOR COMMON SHAREHOLDERS	37,404	32,468	71,856	75,318
EARNINGS PER COMMON SHARE, BASIC
Continuing operations	$ 0.49	$ 0.51	$ 1.02	$ 0.99
Gain on sale of real estate	$ 0.08	$ 0.00	$ 0.08	$ 0.19
Earnings Per Share, Basic, Total	$ 0.57	$ 0.51	$ 1.10	$ 1.18
Weighted average common shares outstanding-basic	65,149	63,700	64,922	63,556
EARNINGS PER COMMON SHARE, DILUTED
Continuing operations	$ 0.49	$ 0.51	$ 1.02	$ 0.99
Gain on sale of real estate	$ 0.08	$ 0.00	$ 0.08	$ 0.19
Earnings Per Share, Diluted, Total	$ 0.57	$ 0.51	$ 1.10	$ 1.18
Weighted average number of common shares-diluted	65,311	63,880	65,080	63,732
Comprehensive Income	47,202	25,803	84,659	71,283
Comprehensive Income Attributable to the Trust	$ 45,944	$ 24,810	$ 82,147	$ 69,154