CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 35,624	$ 24,574
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation	47,349	44,443
Net amortization of debt discounts, premiums and deferred financing fees	629	746
Straight line rental income	(10,962)	(8,092)
Amortization of acquired real estate leases	16,903	14,411
Other amortization	4,800	4,793
Loss on asset impairment	3,946
Loss on early extinguishment of debt	60,027	67
Equity in earnings of investees	(4,262)	(2,958)
Gain on sale of equity investment	(66,293)
Distributions of earnings from investees	4,111	2,913
Gain on sale of properties	(2,856)
Change in assets and liabilities:
Restricted cash	3,100	(782)
Rents receivable and other assets	(21,203)	(23,170)
Accounts payable and accrued expenses	(27,769)	(20,630)
Rent collected in advance	(1,948)	(3,781)
Security deposits	(42)	245
Due to related persons	1,678	2,372
Cash provided by operating activities	42,832	35,151
CASH FLOWS FROM INVESTING ACTIVITIES:
Real estate acquisitions	(149,318)	(91,535)
Real estate improvements	(26,964)	(26,430)
Principal payments received from direct financing lease	1,711	1,632
Proceeds from sale of properties, net	2,163
Proceeds from sale of equity investment, net	239,576
Distributions in excess of earnings from investees	168	1,266
Increase in restricted cash	(1,197)	(8,544)
Cash provided by (used in) investing activities	66,139	(123,611)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common shares, net	626,991	180,954
Repurchase and retirement of outstanding debt securities	(728,021)
Proceeds from borrowings	921,000	338,500
Payments on borrowings	(942,135)	(369,082)
Deferred financing fees	(1,193)	(5,767)
Distributions to common shareholders	(20,951)	(41,861)
Distributions to preferred shareholders	(11,151)	(13,643)
Distributions to noncontrolling interest in consolidated subsidiary	(7,259)
Cash (used in) provided by financing activities	(162,719)	89,101
Effect of exchange rate changes on cash	221	183
(Decrease) increase in cash and cash equivalents	(53,527)	824
Cash and cash equivalents at beginning of period	102,219	192,763
Cash and cash equivalents at end of period	48,692	193,587
SUPPLEMENTAL CASH FLOW INFORMATION:
Interest paid	71,368	66,971
Taxes paid	507	34
NON-CASH INVESTING ACTIVITIES:
Real estate acquisitions		(147,872)
Investment in real estate mortgage receivable	(7,688)
NON-CASH FINANCING ACTIVITIES:
Assumption of mortgage notes payable		$ 147,872