CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Comprehensive income
Net income	$ 227,591	$ 198,719	$ 605,293	$ 511,294
Other comprehensive income, net of tax:
Foreign currency translation adjustments	46,733	(28,233)	68,085	59,442
Net unrealized investment gains	(93,574)	254,658	415,870	1,445,776
Defined benefit pension and postretirement plan adjustments	700	527	2,473	(1,176)
Total other comprehensive income, net of tax	(46,141)	226,952	486,428	1,504,042
Total comprehensive income	$ 181,450	$ 425,671	$ 1,091,721	$ 2,015,336