Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Accounting Policies [Abstract]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent			$ 7,001	$ 15,659
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax			(278)	(2,295)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax			6,108	3,032
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent			12,831	16,396	(95,139)
Net earnings	72,183	68,196	186,214	175,211	269,493
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 88,958	$ 28,538	$ 199,045	$ 191,607