Consolidated Statements Of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Change in unrealized gains on securities, net of taxes of $18,945, $158,653, and $(135,743), respectively	$ 18,945	$ 158,653	$ (135,743)
Change in other-than-temporary impairment gains, net of taxes of $971, $2,240, and $(90), respectively	971	2,240	(90)
Change in foreign currency translation, net of taxes of $(429), $5,100, and $2,745, respectively	(429)	5,100	2,745
Amortization of pension and postretirement unrecognized net periodic benefit cost and change in funded status, net of taxes of $(35,224), $(4,091), and $26,534, respectively	$ (35,224)	$ (4,091)	$ 26,534