Accumulated Other Comprehensive Income (Loss) Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of actuarial losses reclassified to selling, general and administrative expenses, before tax	$ 4,809	$ 6,800
Amortization of actuarial losses reclassified to tax (benefit) expense	(1,870)	(2,646)
Amortization of actuarial losses reclassified to the statement of income, after tax	2,939	4,154
Amortization of prior service costs reclassified to selling, general and administrative expenses, before tax	(304)	(200)
Amortization of prior service costs reclassified to tax (benefit) expense	118	78
Amortization of prior service costs reclassified to the statement of income, after tax	(186)	(122)
Amortization of pension and other postretirement benefit items reclassified to selling, general and administrative expenses, before tax	4,505	6,600
Amortization of pension and other postretirement benefit items reclassified to tax (benefit) expense	(1,752)	(2,568)
Amortization of pension and other postretirement benefit items reclassified to the statement of income, after tax	$ 2,753	$ 4,032