Pension and Severance Plans Textuals (Details) (USD $)			3 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2012 Korean Severance Plan [Member]	Mar. 31, 2011 Korean Severance Plan [Member]	Mar. 31, 2012 Foreign Pension Plans [Member]	Dec. 31, 2011 Foreign Pension Plans [Member]	Mar. 31, 2012 Foreign Country Location [Member]
Defined Benefit Plan Disclosure [Line Items]
Curtailment and settlement losses							$ 1,000,000
Contributions to pension plans					100,000
Expected employer contribution during remaining part of Year						3,200,000
Provision for severance benefit			400,000	5,700,000
Accrued severance plan, minimum service period			1 year
Current (Accrued expenses)			7,224,000	7,476,000
Non-current (Pension and severance obligations)	125,413,000	129,096,000	100,135,000	99,000,000
Total Korean severance obligation			$ 107,359,000	$ 106,476,000