Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
OPERATING ACTIVITIES
Net income	$ 9,429	$ 5,495
Results from discontinued operations	0	(334)
INCOME FROM CONTINUING OPERATIONS	9,429	5,161
Adjustments to reconcile income from continuing operations to net cash provided by operating activities:
Deferred rent revenue and amortization of lease intangibles	(1,874)	(3,071)
Depreciation and amortization	33,966	29,183
Amortization of debt issuance costs and debt fair value adjustments	1,966	1,958
Stock-based compensation expense	1,393	1,406
Loss from real estate joint ventures	54	0
Other, net	(535)	745
Changes in operating assets and liabilities
Change in restricted cash	(818)	(1,244)
Change in accounts receivable	(1,073)	1,628
Change in other assets	(38)	315
Change in accounts payable and accrued expenses	2,662	(1,010)
Change in security deposits payable	238	(204)
Change in other liabilities and deferred credits	303	223
Net cash provided by operating activities of continuing operations	45,673	35,090
Net cash provided by operating activities of discontinued operations	0	252
Net cash provided by operating activities	45,673	35,342
INVESTING ACTIVITIES
Acquisition of real estate, net of cash acquired	0	(32,918)
Capital expenditures	(21,204)	(11,951)
Change in restricted cash	433	(495)
Leasing commissions	(1,344)	(1,312)
Maturity of marketable securities	0	3,324
Net cash used in investing activities of continuing operations	(22,115)	(43,352)
Net cash used in investing activities of discontinued operations	0	(203)
Net cash used in investing activities	(22,115)	(43,555)
FINANCING ACTIVITIES
Change in restricted cash	(1,400)	0
Issuance of secured notes payable	0	21,900
Repayment of secured notes payable	(1,839)	(2,315)
Debt issuance costs	0	(924)
Proceeds from issuance of common stock, net	24,922	0
Dividends paid to common stock and unitholders	(24,380)	(24,226)
Deferred offering costs	0	(361)
Net cash (used in) provided by financing activities	(2,697)	(5,926)
Net increase (decrease) in cash and cash equivalents	20,861	(14,139)
Cash and cash equivalents, beginning of period	42,479	112,723
Cash and cash equivalents, end of period	$ 63,340	$ 98,584