Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data	Sep. 30, 2011	Dec. 31, 2010
Investments in real estate:
Allowance for doubtful accounts	$ 328	$ 305
Accumulated amortization, lease intangibles	28,581	17,105
Liabilities:
Accumulated amortization, acquired below-market lease contracts	$ 8,241	$ 4,989
Stockholders' equity:
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	19,849,222	19,644,042
Common stock, shares outstanding	19,849,222	19,644,042