Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2012	Dec. 31, 2011
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	5,000,000	5,000,000
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares issued	30,023,000	29,931,000
Common stock, shares outstanding	30,023,000	29,931,000
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	44,000	44,000
Preferred stock, shares outstanding	44,000	44,000
Series E Preferred Stock [Member]
Preferred stock, per share redemption value	$ 10	$ 10
Preferred stock, shares issued	1,731,000	1,731,000
Preferred stock, shares outstanding	1,731,000	1,731,000