Consolidated Statement of Comprehensive Income (unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net change in unrealized gains on securities, taxes	$ (62,503)	$ 116,577	$ (77,339)	$ 88,228
Net change in other-than-temporary impairment gains, taxes	(104)	152	571	632
Net change in foreign currency translation, taxes	(46)	(712)	(1,655)	1,943
Net change in pension plan curtailment and amortization of pension and postretirement unrecognized net periodic benefit cost, taxes	$ (219)	$ (1,409)	$ (35,870)	$ (2,818)