CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Income and Comprehensive Income
Net Income		$ 20,664	$ 46,810	$ 209,835	$ 220,796
Other comprehensive income (loss) before tax:
Foreing currency translation adjustment	[1]	(390)	(325)	(1,839)	(2,465)
Amortization of net losses		5,606	5,488	16,819	16,461
Amortization of prior service credit		(950)	(950)	(2,850)	(2,850)
Unrealized holding (losses) gains on investments arising during the period		9,240	(15,428)	15,137	98,900
Other-than-temporary impairment included in net income		0	0	8,299	209
Reclassification adjustment for (gains) losses included in net income (loss)		(103)	(349)	(284)	(349)
Unrealized net (losses) gains on cash flow hedges		(410)	(1,123)	(1,424)	(4,662)
Reclassification adjustment for net (gains) losses included in net income		232	1,650	2,122	4,466
Other comprehensive income (loss) before tax		13,225	(11,037)	35,980	109,710
Income tax benefit (expense)		(1,614)	(646)	(7,026)	(10,119)
Total other comprehensive loss, net of tax		11,611	(11,683)	28,954	99,591
Comprehensive income (loss), net of tax		$ 32,275	$ 35,127	$ 238,789	$ 320,387

[1] All amounts presented are net of tax.