CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 252,998	$ 150,952	$ 175,459
Other comprehensive income:
Unrealized appreciation (depreciation) of available for sale investment securities during the year, net of income tax expense (benefit) of $(9), $9 and $5, respectively	2,105	5,467	(8,018)
Pension and postretirement benefits, net of income tax (benefit) of$17,272, $(2,532) and $(13,232), respectively	28,833	(4,157)	(22,062)
Comprehensive income	$ 283,936	$ 152,262	$ 145,379