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Other Comprehensive Income (Loss) (Accumulated Other Comprehensive Loss In Equity) (Details) - USD ($) $ in Thousands	3 Months Ended					9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Sales and other revenues	$ 4,424,828			$ 4,770,799		$ 13,104,690	$ 13,370,462
Cost of products sold	3,403,767			3,752,234		10,307,856	10,695,275
Operating expenses	345,578			317,196		1,010,422	933,699
Income before income taxes	401,001			478,390		1,071,145	1,332,649
Income tax expense (benefit)	103,021			116,258		279,862	318,742
Other comprehensive income (loss), net of tax	(12,985)	$ 2,804	$ 13,775	10,883	$ (13,580)	3,594	(10,645)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other comprehensive income (loss), net of tax	4,152			(1,215)		9,340	(4,498)
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	0			(1,422)		(1,799)	(5,093)
Cost of products sold	6,027			0		15,323	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	5,573			(1,631)		12,537	(6,038)
Income tax expense (benefit)	1,421			(416)		3,197	(1,540)
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	0			(1,422)		(1,799)	(5,093)
Cost of products sold	6,027			0		15,323	0
Operating expenses	$ (454)			$ (209)		$ (987)	$ (945)