Pension and Severance Plans Textuals (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Non-current (Pension and severance obligations)	$ 158,793,000		$ 158,793,000		$ 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	5,800,000	6,900,000	12,600,000	19,800,000
Current (Accrued expenses)	11,189,000		11,189,000		11,197,000
Non-current (Pension and severance obligations)	139,168,000		139,168,000		133,935,000
Total Korean severance obligation	$ 150,357,000		$ 150,357,000		$ 145,132,000