Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015		Dec. 31, 2014
Net income	$ 308,253	$ 286,924	[1]	$ 959,517
Unrealized gains (losses) on investments:
Unrealized holding gains (losses) arising during the period	8,782	(22,573)		13,650
Less: Reclassification adjustment for net gains (losses) included in net income	2,251	44,183		(1,039)
Net unrealized gains (losses) on investments	6,531	(66,756)		14,689
Net foreign currency translation adjustments	(474)	(217)		(226)
Activity related to investments recorded as assets held for sale	0	(3,254)		(302)
Net actuarial gains (losses)	25	265		(59)
Net unrealized gains (losses) on investments	6,082	(69,962)		14,102
Comprehensive income	$ 314,335	$ 216,962		$ 973,619

[1] For all periods presented, reflects changes to align our segment reporting structure with recent changes in personnel reporting lines and management oversight related to contract underwriting performed on behalf of third parties. Revenue and expenses for this business are now reflected in the Services segment. As a result, for all periods presented, Services revenue and cost of services have increased, with offsetting reductions in other operating expenses.