Condensed Consolidated Statements of Comprehensive Income (Parenthetical) (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Statement of Other Comprehensive Income [Abstract]
Document Fiscal Year Focus			2013
Net unrealized gain (loss) on cash flow hedges, tax	$ 230	$ 321	$ 574	$ 353
Net unrealized loss on investment securities, tax	(3,017)	790	(2,842)	242
Amortization of pension and postretirement costs, tax	$ 4,926	$ 7,070	$ 11,266	$ 13,967