Pension and Severance Plans (Details) (Foreign Pension Plans [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Foreign Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1,399	$ 1,528	$ 2,873	$ 3,229
Interest cost	746	802	1,521	1,622
Expected return on plan assets	(883)	(787)	(1,794)	(1,570)
Amortization of transitional obligation	2	2	4	4
Amortization of prior service cost	49	54	98	125
Recognized actuarial loss	33	52	66	103
Net periodic pension cost	1,346	1,651	2,768	3,513
Curtailment loss	0	0	0	1,089
Settlement gain	0	0	0	(100)
Total Pension Expense	$ 1,346	$ 1,651	$ 2,768	$ 4,502