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Preferred, Common Stock and Additional Paid-in Capital - Share Re-purchase Plan (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended 22 Months Ended 29 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Reinstatement Of Share Repurchase Plan
Dec. 31, 2012
Treasury Stock
Dec. 31, 2011
Treasury Stock
Dec. 31, 2010
Treasury Stock
Share Re-purchase plan            
Share repurchase plan - authorized amount   $ 30,000 $ 3,000      
Share repurchase program - maximum share price     $ 1.3      
Share repurchase plan - shares repurchased and cancelled       61,730 0 0
Repurchase of common shares 900          
Share repurchase plan - remaining authorized amount $ 2,100