Consolidated Statement of Comprehensive Income (unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Net change in unrealized gains on securities, taxes	$ (14,836)	$ (28,349)
Net change in other-than-temporary impairment gains, taxes	674	481
Net change in foreign currency translation, taxes	(1,609)	2,654
Net change in pension plan curtailment and amortization of pension and postretirement unrecognized net periodic benefit cost, taxes	$ (35,651)	$ (1,409)