CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Comprehensive income
Net Income (Loss) Attributable to Parent	$ 701,443	$ 502,166	$ 684,047
Other comprehensive income (loss), net of tax:
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	8,610	(262,998)	(125,236)
Net unrealized investment gains (losses)	419,336	(689,076)	804,528
Change in other-than-temporary impairment losses on fixed maturity securities	(947)		(1,698)
Defined benefit pension and postretirement plan adjustments	3,099	3,229	(27,770)
Total other comprehensive income (loss), net of tax	431,045	(948,845)	651,522
Total comprehensive income (loss)	$ 1,132,488	$ (446,679)	$ 1,335,569