Dividend Restrictions And Statutory Financial Information (Regulatory Targeted Capital And Actual Statutory Capital) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015
Dividend Restrictions And Statutory Financial Information [Abstract]
Regulatory targeted capital	[1]	$ 1,411,440	$ 1,355,668
Actual capital	[1]	$ 3,635,121	$ 3,210,891
Regulatory targeted capital, percent of risk-based capital model		200.00%

[1] Regulatory targeted capital represents 200% of the RBC authorized control level calculation for the applicable year.