Other Comprehensive Income (Loss) (Accumulated Other Comprehensive Loss In Equity) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Sales and other revenues	$ 3,897,247	$ 4,128,427
Cost of products sold	3,199,205	3,347,125
Operating expenses	331,592	320,288
Income before income taxes	363,991	373,899
Income tax expense (benefit)	87,505	85,037
Net of tax and noncontrolling interest	253,055	268,091
Other comprehensive income (loss), net of tax	13,775	(13,580)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Commodity Contract [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Sales and other revenues	(1,799)	1,647
Cost of products sold	3,622	0
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income before income taxes	1,642	1,191
Income tax expense (benefit)	419	304
Net of tax and noncontrolling interest	1,223	887
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Commodity Contract [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Sales and other revenues	(1,799)	1,647
Cost of products sold	3,622	0
Operating expenses	$ (181)	$ (456)