Indemnity Capital Stock (Details 2) (Indemnity, USD $)								1 Months Ended				12 Months Ended		1 Months Ended	12 Months Ended
	Dec. 31, 2012 Long-term incentive plan Employees	Dec. 31, 2013 Class A Long-term incentive plan	Jun. 30, 2013 Class A Long-term incentive plan	Jan. 31, 2013 Class A Long-term incentive plan	Dec. 31, 2012 Class A Long-term incentive plan	Jun. 30, 2012 Class A Long-term incentive plan	Jan. 31, 2012 Class A Long-term incentive plan	Jun. 30, 2013 Class A Long-term incentive plan Performance shares	Jan. 31, 2013 Class A Long-term incentive plan Performance shares	Jun. 30, 2012 Class A Long-term incentive plan Performance shares	Jan. 31, 2012 Class A Long-term incentive plan Performance shares	Dec. 31, 2013 Class A Long-term incentive plan Performance shares	Dec. 31, 2012 Class A Long-term incentive plan Performance shares	Oct. 31, 2011 Class A Stock repurchase program	Dec. 31, 2013 Class A Stock repurchase program	Dec. 31, 2012 Class A Stock repurchase program
Stock repurchases
Shares repurchased under stock repurchase program (in shares)															431,556	978,761
Total cost of shares repurchased under stock repurchase program															$ 31,200,000	$ 69,500,000
Amount of authorized stock repurchase approved for continuation														150,000,000
Approximate amount of repurchase authority remaining under stock repurchase program															37,000,000
Shares repurchased outside of stock repurchase program
Shares repurchased outside of publicly announced stock repurchase program for share-based compensation awards (in shares)								3,033	444	1,134	669	3,477	1,803
Total plan awards paid, share-based		$ 255,454	$ 224,527	$ 30,927	$ 129,849	$ 79,125	$ 50,724
Average price per share (in dollars per share)			$ 74.03	$ 69.65		$ 69.78	$ 75.82
Number of retired senior vice presidents	2