Property, Plant and Equipment (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Total depreciation expense	$ 123,700	$ 111,800	$ 247,900	$ 219,800
Property, Plant and Equipment, Gross	5,580,575		5,580,575		$ 5,369,418
Land [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	207,985		207,985		207,985
Land [Member] | K5 Factory [Member] | KOREA, REPUBLIC OF
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	104,100		104,100		104,100
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	138,835		138,835		39,261
Construction in Progress [Member] | K5 Factory [Member] | KOREA, REPUBLIC OF
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	112,000		112,000		29,800
Accumulated Capitalized Interest Costs	$ 13,000		$ 13,000		$ 8,600