Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 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			$ (8,129)	$ 54,605
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax			(60)	(599)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax			4,245	2,048
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent			(3,944)	56,054	(95,139)
Net earnings	61,704	60,188	114,031	107,015	269,493
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 36,969	$ 97,326	$ 110,087	$ 163,069