Consolidated Statements of Earnings and Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Change in unrealized gains (losses), deferred taxes	$ 280,526	$ 36,468	$ (83,332)
Reclassification for net realized capital gains and other than temporary impairment losses, taxes	(25,806)	(36,281)	(37,044)
Change in unrealized currency translation adjustment, deferred taxes	$ 14,344	$ (3,889)	$ (7,940)