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Property, Plant and Equipment (Narrative) (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
May 31, 2017
Nov. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Property, Plant and Equipment [Line Items]              
Depreciation     $ 148,099 $ 140,728 $ 434,394 $ 414,687  
Property, plant and equipment, gross     6,812,589   6,812,589   $ 6,427,413
Proceeds from sale of property, plant and equipment         133,320 $ 13,687  
Korea              
Property, Plant and Equipment [Line Items]              
Proceeds from sale of property, plant and equipment $ 142,400            
Percentage of proceeds received   10.00%          
Pre-tax gain at close $ 108,100            
Construction in progress              
Property, Plant and Equipment [Line Items]              
Property, plant and equipment, gross     90,972   90,972   87,037
Construction in progress | K5 Facility | Korea              
Property, Plant and Equipment [Line Items]              
Property, plant and equipment, gross     $ 42,400   $ 42,400   $ 44,800