Accumulated Other Comprehensive Income (Loss) Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of actuarial losses reclassified to selling, general and administrative expenses, before tax	$ 28,165	$ 22,835
Amortization of prior service costs reclassified to selling, general and administrative expenses, before tax	(806)	(801)
Amortization of pension and other postretirement benefit items reclassified to selling, general and administrative expenses, before tax	27,359	22,034
Amortization of actuarial losses reclassified to tax (benefit) expense	(10,957)	(8,883)
Amortization of prior service costs reclassified to tax (benefit) expense	314	311
Amortization of pension and other postretirement benefit items reclassified to tax (benefit) expense	(10,643)	(8,572)
Amortization of actuarial losses reclassified to the statement of income, after tax	17,208	13,952
Amortization of prior service costs reclassified to the statement of income, after tax	(492)	(490)
Amortization of pension and other postretirement benefit items reclassified to the statement of income, after tax	$ 16,716	$ 13,462