Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 82,988	$ 51,957	$ 157,852	$ 105,820
Other comprehensive income:
Unrealized appreciation (depreciation) of available for sale investment securities during the period, net of income tax expense (benefit) of $4, $(18), $2 and $(9), respectively	2,170	(3,403)	1,471	(625)
Pension and postretirement benefits, net of income tax expense of $167, $595, $372 and $1,153, respectively	285	592	632	1,438
Comprehensive income	$ 85,443	$ 49,146	$ 159,955	$ 106,633