Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data	Sep. 30, 2011	Dec. 31, 2010
Condensed Consolidated Balance Sheets
Acquired real estate leases, accumulated amortization	$ 26,668	$ 19,294
Tenant rent receivables, allowance for doubtful accounts	1,235	1,600
Straight-line rent receivable, allowance for doubtful accounts	135	700
Office computers and furniture, accumulated depreciation	629	493
Deferred leasing commissions, accumulated amortization	8,619	7,175
Acquired unfavorable real estate leases, accumulated amortization	$ 3,391	$ 2,744
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (in shares)	20,000,000	20,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	180,000,000	180,000,000
Common stock, shares issued (in shares)	82,937,405	81,437,405
Common stock, shares outstanding (in shares)	82,937,405	81,437,405