Pension and Severance Plans (Details) (Foreign Pension Plans [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Foreign Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1,701	$ 1,628
Interest cost	821	909
Expected return on plan assets	(783)	(875)
Amortization of transitional obligation	2	2
Amortization of prior service cost	70	78
Recognized actuarial loss (gain)	51	22
Net periodic pension cost	1,862	1,764
Curtailment loss	1,089	0
Settlement gain	(100)	0
Total Pension Expense	$ 2,851	$ 1,764