Other Comprehensive Income (Loss) Other Comprehensive Income (Loss) Amounts Reclassified to Income Statement (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other Comprehensive Income (Loss) Reclassified to Income Statement [Line Items]
Income tax expense (benefit)									$ (12,379)	$ 19,411	$ 406,060
Net of tax									881,242	(190,945)	802,508
Sales and other revenues	$ (3,992,705)	$ (3,719,247)	$ (3,458,864)	$ (3,080,483)	$ (2,955,068)	$ (2,847,270)	$ (2,714,638)	$ (2,018,724)	(14,251,299)	(10,535,700)	(13,237,920)
Operating expenses									(1,294,234)	(1,018,839)	(1,060,373)
Selling, general and Administrative Expense									(264,874)	(125,648)	(120,846)
Interest Expense									(117,597)	(72,192)	(43,470)
Noncontrolling interest									(75,847)	(69,508)	(62,407)
Net Income (Loss) Attributable to Parent	$ 521,082	$ 272,014	$ 57,767	$ (45,468)	$ 53,165	$ 74,497	$ (409,368)	$ 21,253	805,395	(260,453)	740,101
Reclassification out of Accumulated Other Comprehensive Income [Member]
Other Comprehensive Income (Loss) Reclassified to Income Statement [Line Items]
Reclassifications for the period									(4,988)	(23,847)	31,235
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Other Comprehensive Income (Loss) Reclassified to Income Statement [Line Items]
Interest Income									0	(23)	(51)
Gain on sale of assets									0	0	42
Gain (Loss) on Sale of Securities, Net									0	(23)	(9)
Income tax expense (benefit)									0	(9)	(3)
Net of tax										(14)	(6)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Other Comprehensive Income (Loss) Reclassified to Income Statement [Line Items]
Income tax expense (benefit)									(4,490)	(16,387)	18,454
Net of tax									(7,038)	(26,278)	27,958
Before tax									(11,528)	(42,665)	46,412
Noncontrolling interest									(74)	320	1,273
Net Income (Loss) Attributable to Parent									(7,112)	(25,958)	29,231
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Commodity Contract [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Other Comprehensive Income (Loss) Reclassified to Income Statement [Line Items]
Sales and other revenues									7,836	(20,293)	245,819
Cost of products sold									(299)	0	(179,700)
Operating expenses									(19,244)	(21,864)	(17,607)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Interest Rate Contract [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Other Comprehensive Income (Loss) Reclassified to Income Statement [Line Items]
Interest Expense									179	(508)	(2,100)
Accumulated Defined Benefit Plans Adjustment [Member] | Other Pension, Postretirement and Supplemental Plans [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Other Comprehensive Income (Loss) Reclassified to Income Statement [Line Items]
Income tax expense (benefit)									1,347	1,348	1,277
Net of tax									2,134	2,134	2,022
Cost of products sold									87	130	271
Operating expenses									3,012	2,989	2,681
Selling, general and Administrative Expense									382	363	347
Before tax									3,481	3,482	3,299
Accumulated Defined Benefit Plans Adjustment [Member] | Other Pension Plan [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Other Comprehensive Income (Loss) Reclassified to Income Statement [Line Items]
Income tax expense (benefit)									(7)	(6)	(8)
Net of tax									(10)	(9)	(12)
Selling, general and Administrative Expense									$ 17	$ 15	$ 20