CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Real estate properties:
Land	$ 617,512	$ 599,313
Buildings and improvements	4,580,487	4,420,302
Total real estate properties, gross	5,197,999	5,019,615
Less accumulated depreciation	(808,264)	(714,687)
Total real estate properties, net	4,389,735	4,304,928
Cash and cash equivalents	52,258	42,382
Restricted cash	10,046	9,432
Deferred financing fees, net	29,063	29,410
Acquired real estate leases and other intangible assets, net	105,705	113,986
Other assets	220,523	247,864
Total assets	4,807,330	4,748,002
LIABILITIES AND SHAREHOLDERS' EQUITY
Unsecured revolving credit facility	125,000	190,000
Senior unsecured notes, net of discount	1,093,016	1,092,053
Secured debt and capital leases	703,058	724,477
Accrued interest	21,763	15,757
Assumed real estate lease obligations, net	13,299	13,482
Other liabilities	74,751	65,665
Total liabilities	2,030,887	2,101,434
Commitments and contingencies
Shareholders' equity:
Common shares of beneficial interest, $.01 par value: 199,700,000 shares authorized, 188,168,168 and 176,553,600 shares issued and outstanding at September 30, 2013 and December 31, 2012, respectively	1,881	1,765
Additional paid in capital	3,497,588	3,233,354
Cumulative net income	1,122,778	1,043,821
Cumulative other comprehensive income	6,689	4,562
Cumulative distributions	(1,852,493)	(1,636,934)
Total shareholders' equity	2,776,443	2,646,568
Total liabilities and shareholders' equity	$ 4,807,330	$ 4,748,002