Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Preferred stock, par value (usd per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (shares)	5,000,000	5,000,000
Common stock, par value (usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized (shares)	150,000,000	150,000,000
Common stock, shares issued (shares)	30,073,000	29,931,000
Common stock, shares outstanding (shares)	30,073,000	29,931,000
Series A [Member]
Preferred stock, per share liquidation value (usd per share)	$ 1,000	$ 1,000
Preferred stock, shares issued (shares)	0	0
Preferred stock, shares outstanding (shares)	0	0
Series B [Member]
Preferred stock, per share liquidation value (usd per share)	$ 29	$ 29
Preferred stock, shares issued (shares)	44,000	44,000
Preferred stock, shares outstanding (shares)	44,000	44,000
Series E [Member]
Preferred stock, per share redemption value (usd per share)	$ 10	$ 10
Preferred stock, shares issued (shares)	1,731,000	1,731,000
Preferred stock, shares outstanding (shares)	1,731,000	1,731,000
Preferred Stock, Aggregate liquidation value	$ 31,237