Indemnity Capital Stock (Details) - Indemnity - shares	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Class A
Common Stock
Class A common stock shares issued upon conversion of Class B common stock shares (in shares)	0	0
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)	0	0