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, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Other Comprehensive Income (Loss) Reclassified to Income Statement [Line Items]
Income tax expense (benefit)									$ 19,411	$ 406,060	$ 141,172
Net of tax									(190,945)	802,508	326,328
Sales and other revenues	$ (2,955,068)	$ (2,847,270)	$ (2,714,638)	$ (2,018,724)	$ (2,943,559)	$ (3,585,823)	$ (3,701,912)	$ (3,006,626)	(10,535,700)	(13,237,920)	(19,764,327)
Operating expenses									(1,018,839)	(1,060,373)	(1,144,940)
General and Administrative Expense									125,648	120,846	114,609
Interest Expense									(72,192)	(43,470)	(43,646)
Noncontrolling interest									(69,508)	(62,407)	(45,036)
Net of tax and noncontrolling interest	$ 53,165	$ 74,497	$ (409,368)	$ 21,253	$ (43,921)	$ 196,322	$ 360,824	$ 226,876	(260,453)	740,101	281,292
Reclassification out of Accumulated Other Comprehensive Income [Member]
Other Comprehensive Income (Loss) Reclassified to Income Statement [Line Items]
Reclassifications for the period									(23,847)	31,235	33,296
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									(23)	(51)	4
Gain on sale of assets									0	42	0
Gain (Loss) on Sale of Securities, Net									(23)	(9)	4
Income tax expense (benefit)									(9)	(3)	2
Net of tax									(14)	(6)	2
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)									(16,387)	18,454	19,712
Net of tax									(26,278)	27,958	29,890
Before tax									(42,665)	46,412	49,602
Noncontrolling interest									320	1,273	1,335
Net of tax and noncontrolling interest									(25,958)	29,231	31,225
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									(20,293)	245,819	88,326
Cost of products sold									0	(179,700)	(37,313)
Operating expenses									(21,864)	(17,607)	791
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									(508)	(2,100)	(2,202)
Accumulated Defined Benefit Plans Adjustment [Member] | Other Pension Plan, Postretirement or 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)									1,348	1,277	1,663
Net of tax									2,134	2,022	2,633
Cost of products sold									130	271	482
Operating expenses									2,989	2,681	3,366
General and Administrative Expense									(363)	(347)	(448)
Before tax									3,482	3,299	4,296
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)									(6)	(8)	(356)
Net of tax									(9)	(12)	(564)
General and Administrative Expense									$ (15)	$ (20)	$ (920)