Subsequent Events (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Jul. 31, 2013	Apr. 30, 2013	Jan. 31, 2013	Jan. 22, 2015	Oct. 21, 2014
Subsequent Event [Line Items]
Stock Repurchase Program, Authorized Amount	$ 300,000,000.0		$ 100,000,000.0	$ 100,000,000.0	$ 200,000,000.0
Other policy claims and benefits	3,824,069,000	3,571,761,000
Subsequent Event [Member]
Subsequent Event [Line Items]
Stock Repurchase Program, Authorized Amount						300,000,000.0
Agreement To Purchase Policies In Force							82,000
Other policy claims and benefits							$ 2,700,000,000