Indemnity Capital Stock (Details) (Indemnity)	3 Months Ended		9 Months Ended
	Dec. 31, 2012	Mar. 31, 2012	Sep. 30, 2013
Class A
Common Stock
Class A common stock shares issued upon conversion of Class B common stock shares (in shares)	4,800	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	2	0