Accumulated Other Comprehensive Loss (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, beginning of period	$ (75,419)
Other comprehensive loss before reclassifications	(2,588)
Amounts reclassified from accumulated other comprehensive loss to Consolidated Statement of Income	27
Net current period other comprehensive loss	(2,561)
Accumulated other comprehensive loss, end of period	(77,980)
Pensions and postretirement benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, beginning of period	(81,983)
Other comprehensive loss before reclassifications	550
Amounts reclassified from accumulated other comprehensive loss to Consolidated Statement of Income	0
Net current period other comprehensive loss	550
Accumulated other comprehensive loss, end of period	(81,433)
Unrealized losses on derivative instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, beginning of period	(2,514)
Other comprehensive loss before reclassifications	(246)
Amounts reclassified from accumulated other comprehensive loss to Consolidated Statement of Income	27
Net current period other comprehensive loss	(219)
Accumulated other comprehensive loss, end of period	(2,733)
Foreign currency translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, beginning of period	9,078
Other comprehensive loss before reclassifications	(2,892)
Amounts reclassified from accumulated other comprehensive loss to Consolidated Statement of Income	0
Net current period other comprehensive loss	(2,892)
Accumulated other comprehensive loss, end of period	$ 6,186