Statements of Consolidated Comprehensive Income Statement (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Net Income	$ 21,792	$ 12,893
Foreign currency translation adjustment	(3,064)	122
Amortization of net actuarial loss included in net periodic benefit expense or income, net of deferred tax of $1,285 and $794, respectively	2,069	1,243
Amortization of prior service credit included in net periodic benefit expense or income, net of deferred tax of $80 and $122, respectively	(128)	(189)
Other Comprehensive Income, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	1,941	1,054
Total Other Comprehensive Income (Loss)	(1,123)	1,176
Comprehensive Income	$ 20,669	$ 14,069