Pension and Severance Plans (Details) (Foreign Pension Plans [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Foreign Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1,500	$ 1,561	$ 4,373	$ 4,789
Interest cost	842	817	2,363	2,439
Expected return on plan assets	(852)	(800)	(2,646)	(2,370)
Amortization of transitional obligation	3	2	7	6
Amortization of prior service cost	50	54	148	179
Recognized actuarial loss	33	51	99	154
Net periodic pension cost	1,576	1,685	4,344	5,197
Curtailment (gain) loss	(148)	0	(148)	1,089
Settlement gain	(209)	0	(209)	(100)
Total Pension Expense	$ 1,219	$ 1,685	$ 3,987	$ 6,186