CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 39,930	$ 25,013
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation	17,273	15,656
Net amortization of debt premium and deferred financing fees	663	659
Straight line rental income	(1,654)	(1,564)
Amortization of acquired real estate leases	10,413	9,274
Amortization of deferred leasing costs	590	387
Other non-cash expenses	1,046	646
Net gain on sale of properties	(8,168)
Equity in earnings of an investee	(155)	(121)
Change in assets and liabilities:
Restricted cash	(183)	(2,234)
Deferred leasing costs	(2,075)	(811)
Rents receivable	(59)	3,478
Other assets	1,258	2,162
Accounts payable and accrued expenses	397	486
Due to related persons	(787)	(463)
Cash provided by operating activities	58,489	52,568
CASH FLOWS FROM INVESTING ACTIVITIES:
Real estate acquisitions and deposits		(38,850)
Real estate improvements	(6,542)	(4,711)
Proceeds from sale of properties, net	18,374
Cash provided by (used in) investing activities	11,832	(43,561)
CASH FLOWS FROM FINANCING ACTIVITIES:
Repayment of mortgage notes payable	(955)	(881)
Borrowings on unsecured revolving credit facility	46,500	27,000
Repayments on unsecured revolving credit facility	(71,000)	(345,500)
Proceeds from unsecured term loan		350,000
Financing fees		(1,964)
Distributions to common shareholders	(47,002)	(39,540)
Cash used in financing activities	(72,457)	(10,885)
Decrease in cash and cash equivalents	(2,136)	(1,878)
Cash and cash equivalents at beginning of period	5,255	3,272
Cash and cash equivalents at end of period	3,119	1,394
Supplemental cash flow information:
Interest paid	7,610	7,695
Income taxes paid	128	86
Non-cash financing activities:
Issuance of common shares	$ 821	$ 1,165