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Property, Plant and Equipment (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Property, Plant and Equipment [Line Items]          
Depreciation $ 137,451 $ 123,730 $ 273,959 $ 247,851  
Property, Plant and Equipment, Gross 6,308,105   6,308,105   $ 6,072,394
Construction in Progress [Member]          
Property, Plant and Equipment [Line Items]          
Property, Plant and Equipment, Gross 434,891   434,891   352,607
Construction in Progress [Member] | K5 Facility [Member] | KOREA, REPUBLIC OF          
Property, Plant and Equipment [Line Items]          
Property, Plant and Equipment, Gross 363,900   363,900   312,100
Accumulated Capitalized Interest Costs $ 23,000   $ 23,000   $ 18,700