Condensed Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement of Comprehensive Income [Abstract]
Net unrealized gain (loss) on cash flow hedges, tax	$ 420	$ 41	$ 925	$ 615
Net unrealized loss on investment securities, tax	(546)	(142)	1,908	(2,984)
Amortization of pension and postretirement costs, tax	$ 3,355	$ 4,347	$ 10,609	$ 15,613