Statutory Information (Summary Of Statutory Net Income And Capital And Surplus) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statutory Accounting Practices [Line Items]
Total statutory net income	[1]	$ 888,715	$ 170,863	$ 508,200
Total statutory capital and surplus		1,684,493	2,291,115
After-tax exit and disposal costs		106,389
P&C companies
Statutory Accounting Practices [Line Items]
Total statutory net income		288,475	437,422	440,930
Total statutory capital and surplus		1,175,565	1,137,978
Life and Health companies
Statutory Accounting Practices [Line Items]
Total statutory net income		600,240	(266,559)	$ 67,270
Total statutory capital and surplus		$ 508,928	$ 1,153,137

[1] higher loss experience and adverse claims development on 2015 individual major medical policies, a reduction in the 2014 estimated recoveries from the Affordable Care Act risk mitigation programs and $106,389 (after-tax) of exit and disposal costs, including premium deficiency reserves, severance and retention costs, long-lived asset impairments and similar exit and disposal costs related to the decision to exit the health business mentioned above.