Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	5,000	5,000
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	150,000	150,000
Common stock, shares issued	29,931	23,160
Common stock, shares outstanding	29,931	23,160
Series A Preferred Stock [Member]
Preferred stock, per share liquidation value	$ 1,000	$ 1,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Series B Preferred Stock [Member]
Preferred stock, per share liquidation value	$ 29	$ 29
Preferred stock, shares issued	44	44
Preferred stock, shares outstanding	44	44
Series E Preferred Stock [Member]
Preferred stock, per share redemption value	$ 10	$ 10
Preferred stock, shares issued	1,731	1,731
Preferred stock, shares outstanding	1,731	1,731