Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Translation Adjustment Functional to Reporting Currency, Net of Tax	$ 32,766		$ 56,012
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	(5,259)		(5,438)
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	(142,083)		(148,035)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(114,576)		(97,461)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(653)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Reclassification Adjustments, Net of Tax	0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	(23,246)
Accumulated Other Comprehensive Income, Derivative Foreign Currency Translation	(10)
Accumulated Other Comprehensive Income, Foreign Currency Translation of Defined Benefit Plan Balance	4,287
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(18,969)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment Realized upon Sale or Liquidation, Net of Tax	0
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Net of Tax	842
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	1,665
Other Comprehensive Income (Loss), Reclassification Adjustments, Attributable to Parent, Net of Tax	2,507
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax	(23,246)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent	179
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax, Portion Attributable to Parent	5,952
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	$ (17,115)	$ 20,791	$ (10,523)