Statements Of Consolidated Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Statements Of Consolidated Comprehensive Income [Abstract]
Net Income	$ 25,646	$ 6,922
Other Comprehensive Income:
Foreign currency translation adjustment	730	994
Unrealized gain on available-for-sale security, net of deferred tax of $45 and $24, respectively	70	37
Employee benefit plans
Amortization of actuarial loss included in expense, net of deferred tax of $1,858 and $1,011, respectively	2,951	1,582
Other Comprehensive Income	3,751	2,613
Comprehensive Income	$ 29,397	$ 9,535