Statements Of Consolidated Comprehensive Income (Parenthetical) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Unrealized gain on available-for-sale security, net of deferred tax	$ 0	$ 45,000
Net loss included in net periodic benefit expense or income, net of deferred tax	1,922,000	1,975,000
Amortization of prior service cost or credit included in net periodic benefit expense or income, net of deferred tax	$ 61,000	$ 117,000