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Indemnity Capital Stock (Details) (Indemnity)
3 Months Ended 6 Months Ended
Mar. 31, 2012
Jun. 30, 2013
Dec. 31, 2012
Class A
     
Common Stock      
Class A common stock shares issued upon conversion of Class B common stock shares (in shares) 4,800    
Class B
     
Common Stock      
Ratio for converting shares of Class B common stock into shares of Class A common stock (as a percent)   2400.00% 2400.00%
Class B common stock shares converted into Class A common stock shares (in shares) 2 0