CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Income and Comprehensive Income
Net Income	$ 171,106	$ 279,783	$ 339,031	$ 371,107
Reclassification to retained earnings due to cumulative effect of accounting change	0	0	(50)	(605)
Other comprehensive income (loss) before tax:
Foreing currency translation adjustment	(1,204)	(3,456)	(2,442)	(3,363)
Amortization of net losses of pension and postretirement benefit plans	5,876	5,385	11,752	10,771
Amortization of prior service credit of pension and postretirement benefit plans	0	(868)	0	(1,735)
Unrealized holding gains (losses) on debt securities arising during the period	143,441	(36,223)	253,304	(157,412)
Unrealized net (losses) gains on cash flow hedges	(1,138)	(270)	(1,820)	955
Reclassification adjustment for net losses (gains) included in net income	891	250	1,921	(1,017)
Other comprehensive income (loss) before tax	147,866	(35,182)	262,665	(152,406)
Income tax (expense) benefit	(15,100)	1,228	(25,904)	6,266
Total other comprehensive income (loss), net of tax	132,766	(33,954)	236,761	(146,140)
Comprehensive income (loss), net of tax	$ 303,872	$ 245,829	$ 575,792	$ 224,967