Pension and Severance Plans Textuals (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Non-current (Pension and severance obligations)	$ 159,936,000		$ 159,936,000		$ 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	1,200,000	7,300,000	6,800,000	12,800,000
Current (Accrued expenses)	11,794,000		11,794,000		11,197,000
Non-current (Pension and severance obligations)	140,484,000		140,484,000		133,935,000
Total Korean severance obligation	$ 152,278,000		$ 152,278,000		$ 145,132,000