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Preferred, Common Stock and Additional Paid-in Capital - Share Repurchase Plan (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 6 Months Ended 22 Months Ended 29 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2011
Dec. 31, 2012
Reinstatement Of Share Repurchase Plan
Jun. 30, 2013
Treasury Stock
Jun. 30, 2012
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 $ 861