CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities:
Net income	$ 38,580	$ 35,235
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation	38,355	38,302
Amortization of deferred financing fees and debt discounts	1,456	1,065
Straight line rental income	(1,583)	(1,833)
Amortization of acquired real estate leases and other intangible assets	722	995
Impairment of assets	721	1,304
Gain on sale of properties	(156)
Equity in losses / (earnings) of an investee	97	(76)
Change in assets and liabilities:
Restricted cash	2,012	(2,444)
Other assets	3,082	(3,822)
Accrued interest	6,060	5,838
Other liabilities	771	(868)
Cash provided by operating activities	90,117	73,696
Cash flows from investing activities:
Real estate acquisitions and deposits	(50,050)	(73,406)
Real estate improvements	(17,101)	(3,265)
Proceeds from sale of properties	2,400
Cash used for investing activities	(64,751)	(76,671)
Cash flows from financing activities:
Proceeds from issuance of common shares, net		261,859
Proceeds from borrowings on revolving credit facility	90,000
Repayments of borrowings on revolving credit facility	(45,000)	(190,000)
Repayment of other debt	(3,246)	(3,199)
Payment of deferred financing fees		(221)
Distributions to shareholders	(73,386)	(68,857)
Cash used for financing activities	(31,632)	(418)
Decrease in cash and cash equivalents	(6,266)	(3,393)
Cash and cash equivalents at beginning of period	39,233	42,382
Cash and cash equivalents at end of period	32,967	38,989
Supplemental cash flow information:
Interest paid	21,384	22,660
Income taxes paid	200	81
Non-cash investing activities:
Acquisitions funded by assumed debt		(12,266)
Non-cash financing activities:
Assumption of mortgage notes payable		12,266
Issuance of common shares	$ 438	$ 582