Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Net income	$ 98,112	$ 50,048	$ 164,361	$ 142,305
Unrealized gains (losses) on investments:
Unrealized holding gains (losses) arising during the period	40,297	(21,620)	79,671	(15,166)
Less: Reclassification adjustment for net gains (losses) included in net income	758	44,664	(1,399)	44,631
Net unrealized gains (losses) on investments	39,539	(66,284)	81,070	(59,797)
Net foreign currency translation adjustments	(225)	158	(310)	32
Activity related to investments recorded as assets held for sale	0	(5,082)	0	(3,254)
Net actuarial gains (losses)	0	0	(178)	0
Other comprehensive income (loss), net of tax	39,314	(71,208)	80,582	(63,019)
Comprehensive income (loss)	$ 137,426	$ (21,160)	$ 244,943	$ 79,286