Other Comprehensive Income (Loss) (Accumulated Other Comprehensive Loss In Equity) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Sales and other revenues	$ 3,458,864	$ 2,714,638	$ 6,539,347	$ 4,733,362
Operating expenses	315,652	251,336	622,769	503,919
Interest expense	(29,645)	(14,251)	(56,803)	(26,338)
Income (loss) before income taxes	106,069	(430,515)	51,498	(364,817)
Income tax expense (benefit)	31,996	(38,045)	15,207	(15,737)
Net of tax and noncontrolling interest	57,767	(409,368)	12,299	(388,115)
Other comprehensive income (loss), net of tax	10,594	10,334	8,156	9,648
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	56	(13,623)	(335)	(20,635)
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	157	(22,293)	(474)	(33,849)
Income tax expense (benefit)	36	(8,601)	(212)	(13,019)
Net income	121	(13,692)	(262)	(20,830)
Noncontrolling interest	(65)	69	(73)	209
Net of tax and noncontrolling interest	56	(13,623)	(335)	(20,621)
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	4,476	(15,897)	8,426	(20,653)
Cost of Goods Sold			(299)	0
Operating expenses	(4,421)	(6,283)	(8,716)	(12,853)
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	$ 102	$ (113)	$ 115	$ (343)