Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Net income	$ 82,803	$ 70,091	$ 247,164	$ 212,396
Unrealized gains (losses) on investments:
Unrealized holding gains (losses) arising during the period	6,943	4,012	86,614	(11,154)
Less: Reclassification adjustment for net gains (losses) included in net income	3,695	(223)	2,296	44,408
Net unrealized gains (losses) on investments	3,248	4,235	84,318	(55,562)
Net foreign currency translation adjustments	(36)	(120)	(346)	(88)
Activity related to investments recorded as assets held for sale	0	0	0	(3,254)
Net actuarial gains (losses)	156	0	(22)	0
Other comprehensive income (loss), net of tax	3,368	4,115	83,950	(58,904)
Comprehensive income	$ 86,171	$ 74,206	$ 331,114	$ 153,492