Pension and Severance Plans (Details) (Foreign Pension Plans [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Foreign Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1,101	$ 1,500	$ 3,974	$ 4,373
Interest cost	748	842	2,321	2,363
Expected return on plan assets	(782)	(852)	(2,329)	(2,646)
Amortization of transition obligation	0	3	75	7
Amortization of prior service cost	9	50	108	148
Recognized actuarial loss	17	33	50	99
Net periodic pension cost	1,093	1,576	4,199	4,344
Curtailment gain	0	148	0	148
Settlement Gain	0	209	0	209
Total pension expense	$ 1,093	$ 1,219	$ 4,199	$ 3,987