Property, Plant and Equipment (Narrative) (Details) $ in Thousands, ₩ in Billions			1 Months Ended	3 Months Ended
	May 05, 2017 USD ($)	May 05, 2017 KRW (₩)	Nov. 30, 2016	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)
Property, Plant and Equipment [Line Items]
Depreciation				$ 141,456	$ 136,508
Property, plant and equipment, gross				6,482,768		$ 6,427,413
Proceeds from sale of property, plant and equipment				1,835	$ 121
Assets held-for-sale, current				34,300
Korea
Property, Plant and Equipment [Line Items]
Percentage of proceeds received			10.00%
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross				89,799		87,037
Construction in progress | K5 Facility | Korea
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross				$ 46,800		$ 44,800
Subsequent Event | Korea
Property, Plant and Equipment [Line Items]
Proceeds from sale of property, plant and equipment	$ 142,000	₩ 162.1
Pre-tax gain at close	$ 108,000