CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Income and Comprehensive Income
Net Income	$ 92,945	$ 84,999
Other comprehensive income (loss) before tax:
Foreing currency translation adjustment	139	(705)
Amortization of net losses	5,607	5,486
Amortization of prior service credit	(950)	(950)
Unrealized holding (losses) gains on investments arising during the period	(2,907)	76,236
Reclassification adjustment for (gains) losses included in net income (loss)	(162)	0
Unrealized net (losses) gains on cash flow hedges	(637)	(2,000)
Reclassification adjustment for net (gains) losses included in net income	855	1,545
Other comprehensive income (loss) before tax	1,945	79,612
Income tax benefit (expense)	(1,571)	(4,476)
Total other comprehensive loss, net of tax	374	75,136
Comprehensive income (loss), net of tax	$ 93,319	$ 160,135