Pension and Severance Plans (Details) (Foreign Pension Plans [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Foreign Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1,474	$ 1,701
Interest cost	775	821
Expected return on plan assets	(911)	(783)
Amortization of transitional obligation	2	2
Amortization of prior service cost	49	70
Recognized actuarial loss	33	51
Net periodic pension cost	1,422	1,862
Curtailment loss	0	1,089
Settlement gain	0	(100)
Total Pension Expense	$ 1,422	$ 2,851