Other Comprehensive Income (Loss) (Accumulated Other Comprehensive Loss In Equity) (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Sales and other revenues	$ 4,782,615		$ 4,471,236		$ 8,679,862	$ 8,599,663
Cost of products sold	3,704,884		3,595,916		6,904,089	6,943,041
Operating expenses	333,252		296,215		664,844	616,503
Interest expense	34,264		32,324		70,911	65,047
Income before income taxes	306,153		480,360		670,144	854,259
Income tax expense (benefit)	89,336		117,447		176,841	202,484
Net of tax and noncontrolling interest	196,915		345,507		449,970	613,598
Other comprehensive income (loss), net of tax	2,804	$ 13,775	(7,948)	$ (13,580)	16,579	(21,528)
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	3,964		(4,171)		5,187	(3,283)
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		(5,317)		(1,799)	(3,671)
Cost of products sold	5,674		0		9,295	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	5,321		(5,598)		6,963	(4,407)
Income tax expense (benefit)	1,357		(1,427)		1,776	(1,124)
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		(5,317)		(1,799)	(3,671)
Cost of products sold	5,674		0		9,295	0
Operating expenses	$ (353)		$ (281)		$ (533)	$ (736)