Pension and Severance Plans (Changes and Components) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 5,744	$ 5,934
Interest cost	3,274	3,736
Settlements	9,563	0
Foreign Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	5,744	5,934	4,381
Interest cost	3,274	3,736	2,959
Expected return on plan assets	(3,119)	(2,336)	(1,350)
Amortization of transition obligation	8	13	64
Amortization of prior service cost	269	295	80
Defined Benefit Plan, Amortization of Gains (Losses)	83	27	(17)
Net periodic pension cost	6,259	7,669	6,117
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments	1,016	0	(528)
Settlements	565	0	(586)
Total Pension Expense	$ 7,840	$ 7,669	$ 5,003