Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Accounts receivable, allowance for doubtful accounts	$ 194	$ 133
Preferred stock, shares authorized	40,000,000	40,000,000
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares outstanding	23,070,387	22,917,509
Noncontrolling interest in consolidated partnership, redemption value	64	250
Preferred Stock Series A [Member]
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	2,500,000	2,500,000
Preferred stock, shares outstanding	803,270	803,270
Preferred stock, liquidation preference	8,033	8,033
Redeemable Preferred Stock Series B [Member]
Redeemable preferred stock, shares authorized	800,000	800,000
Preferred stock, par value	$ 0.01	$ 0.01
Redeemable preferred stock, shares outstanding	332,500	332,500
Preferred stock, liquidation preference	$ 8,312	$ 8,312