CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
CONSOLIDATED BALANCE SHEETS
Allowance for doubtful accounts (in dollars)	$ 625	$ 465
Accumulated amortization, lease intangibles (in dollars)	33,050	33,711
Accumulated amortization, acquired below-market lease contracts (in dollars)	10,062	9,267
Series A Cumulative Preferred Stock, dividend rate (as a percent)	7.25%	7.25%
Series A Cumulative Preferred Stock, liquidation preference	$ 115,000	$ 0
Series A Cumulative Preferred Stock, liquidation preference (in dollars per share)	$ 25.00	$ 25.00
Series A Cumulative Preferred Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Series A Cumulative Preferred Stock, shares issued	4,600,000	0
Series A Cumulative Preferred Stock, shares outstanding	4,600,000	0
Common Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common Stock, shares authorized	100,000,000	100,000,000
Common Stock, shares issued	21,202,673	20,747,794
Common Stock, shares outstanding	21,202,673	20,747,794