Other Comprehensive Income (Loss) (Accumulated Other Comprehensive Loss In Equity) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Sales and other revenues	$ 3,719,247	$ 2,847,270	$ 10,258,594	$ 7,580,632
Operating expenses	321,668	256,232	944,437	760,151
Interest expense	(28,731)	(19,550)	(85,534)	(45,888)
Income (loss) before income taxes	446,103	109,867	497,601	(254,950)
Income tax expense (benefit)	158,386	22,196	173,593	6,459
Net of tax and noncontrolling interest	272,014	74,497	284,313	(313,618)
Other comprehensive income (loss), net of tax	12,853	1,953	21,009	11,601
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	(3,326)	(2,668)	(3,661)	(23,303)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest income			0	(23)
Income tax expense (benefit)			0	(9)
Net income			0	(14)
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 (loss) before income taxes	(5,385)	(4,411)	(5,859)	(38,260)
Income tax expense (benefit)	(2,100)	(1,685)	(2,312)	(14,704)
Net income	(3,285)	(2,726)	(3,547)	(23,556)
Noncontrolling interest	(41)	58	(114)	267
Net of tax and noncontrolling interest	(3,326)	(2,668)	(3,661)	(23,289)
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	(488)	228	7,937	(20,425)
Cost of Goods Sold			(299)	0
Operating expenses	(4,961)	(4,544)	(13,676)	(17,397)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Interest Rate Swap [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ 64	$ (95)	$ 179	$ (438)