Pension and Severance Plans (Defined Benefit Plans) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation	$ 78,897	$ 72,678	$ 58,994
Defined Benefit Plan, Service Cost	5,744	5,934
Defined Benefit Plan, Interest Cost	3,274	3,736
Defined Benefit Plan, Actual Return on Plan Assets	815	4,111
Defined Benefit Plan, Contributions by Employer	3,629	7,856	15,400
Defined Benefit Plan, Settlements, Plan Assets	(9,563)	0
Defined Benefit Plan, Benefits Paid	(849)	(849)
Defined Benefit Plan, Actuarial Losses (Gains)	4,755	(160)
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Plan Assets	32	2,856
Defined Benefit Plan, Plan Amendments	25	0
Defined Benefit Plan, Effects of Curtailment	1,016	0
Defined Benefit Plan, Settlements, Benefit Obligation	(9,563)	0
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Benefit Obligation	1,817	5,023
Defined Benefit Plan, Funded Status of Plan	(30,096)	(17,941)
Defined Benefit Plan, Prepaid benefit cost (included in non-current assets)	0	3,092
Defined Benefit Plans, Accrued benefit liability (included in pension and severance obligations)	(30,096)	(21,033)
Defined Benefit Plan, Net Amounts Recognized at Year End	(30,096)	(17,941)
Defined Benefit Plan, Accumulated Benefit Obligation	52,500	48,000
Defined Benefit Plan, Fair Value of Plan Assets	48,801	54,737	40,763
Defined Benefit Plan, Plans with Benefit Obligations in Excess of Plan Assets, Aggregate Benefit Obligation	78,897	28,863
Defined Benefit Plan, Plans with Benefit Obligations in Excess of Plan Assets, Aggregate Fair Value of Plan Assets	48,801	7,830
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Accumulated Benefit Obligation	22,669	18,067
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Fair Value of Plan Assets	$ 0	$ 0
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	5.20%	6.40%	7.90%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	4.20%	5.20%	6.40%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase	4.60%	5.70%	5.70%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase	4.50%	4.60%	5.90%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	6.40%	5.40%	5.70%