Statements Of Consolidated Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Unrealized gain on available-for-sale security, net of deferred tax	$ 0	$ 82	$ 0	$ 37
Net loss included in net periodic benefit expense or income, net of deferred tax	1,859	2,019	3,781	3,993
Amortization of prior service cost or credit included in net periodic benefit expense or income, net of deferred tax	$ 61	$ (116)	$ 122	$ (232)