Pension and Severance Plans Textuals (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Non-current (Pension and severance obligations)	$ 168,020,000		$ 165,073,000
Korean Severance Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Accrued severance plan, minimum service period	1 year
Provision for severance benefits	5,600,000	5,500,000
Current (Accrued expenses)	11,414,000		11,197,000
Non-current (Pension and severance obligations)	135,552,000		133,935,000
Total Korean severance obligation	$ 146,966,000		$ 145,132,000