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Revenue from Contracts with Customers (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | $ 425,324 | $ 750,337 | $ 1,311,627 | $ 2,060,127
(Loss) gain on crude contracts | (5,290) | 63,247 | 319,502 | 121,163
Gain on sale of assets and other income | 1,831 | 3,493 | 6,006 | 10,283
Total revenues and other income | 421,865 | 817,077 | 1,637,135 | 2,191,573
Net crude oil and condensate revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 354,947 | 680,131 | 1,110,365 | 1,850,542
Net natural gas liquids revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 14,311 | 16,722 | 35,490 | 49,668
Net natural gas revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 56,066 | 53,484 | 165,772 | 159,917
United States | Net crude oil and condensate revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 86,498 | 219,515 | 272,284 | 547,756
United States | Net natural gas liquids revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 6,766 | 5,557 | 16,145 | 22,497
United States | Net natural gas revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 4,529 | 5,848 | 14,177 | 20,762
United States Offshore | Net crude oil and condensate revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 216,918 | 398,518 | 714,143 | 1,090,462
United States Offshore | Net natural gas liquids revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 4,765 | 8,414 | 13,255 | 18,184
United States Offshore | Net natural gas revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 9,827 | 15,879 | 35,487 | 29,575
Canada | Net crude oil and condensate revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 32,358 | 31,758 | 67,268 | 88,730
Canada | Net natural gas liquids revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 2,780 | 2,751 | 6,090 | 8,987
Canada | Net natural gas revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 41,710 | 31,757 | 116,108 | 109,580
Canada Offshore | Net crude oil and condensate revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | 19,173 | 28,407 | 54,864 | 115,686
Other | Net crude oil and condensate revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue from contracts with customers | $ 0 | $ 1,933 | $ 1,806 | $ 7,908

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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