Accumulated Other Comprehensive Income (Loss) Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of actuarial losses reclassified to selling, general and administrative expenses, before tax	$ 4,644	$ 7,282	$ 9,453	$ 14,082
Amortization of actuarial losses reclassified to tax (benefit) expense	(1,808)	(2,833)	(3,678)	(5,478)
Amortization of actuarial losses reclassified to the statement of income, after tax	2,836	4,449	5,775	8,604
Amortization of prior service costs reclassified to selling, general and administrative expenses, before tax	(310)	(202)	(614)	(402)
Amortization of prior service costs reclassified to tax (benefit) expense	121	79	239	156
Amortization of prior service costs reclassified to the statement of income, after tax	(189)	(123)	(375)	(246)
Amortization of pension and other postretirement benefit items reclassified to selling, general and administrative expenses, before tax	4,334	7,080	8,839	13,680
Amortization of pension and other postretirement benefit items reclassified to tax (benefit) expense	(1,687)	(2,754)	(3,439)	(5,322)
Amortization of pension and other postretirement benefit items reclassified to the statement of income, after tax	$ 2,647	$ 4,326	$ 5,400	$ 8,358