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Revenue from Contracts with Customers (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | $ 592,527 | $ 600,558
(Loss) gain on crude contracts | (214,385) | 400,672
Gain on sale of assets and other income | 1,843 | 2,498
Total revenues and other income | 379,985 | 1,003,728
Net crude oil and condensate revenue |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 490,796 | 528,069
Net natural gas liquids revenue |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 21,569 | 12,563
Net natural gas revenue |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 80,162 | 59,926
United States | Net crude oil and condensate revenue |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 114,490 | 131,236
United States | Net natural gas liquids revenue |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 7,528 | 5,503
United States | Net natural gas revenue |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 6,443 | 5,558
United States Offshore | Net crude oil and condensate revenue |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 328,341 | 346,972
United States Offshore | Net natural gas liquids revenue |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 10,054 | 5,026
United States Offshore | Net natural gas revenue |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 22,138 | 14,995
Canada | Net crude oil and condensate revenue |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 29,903 | 23,383
Canada | Net natural gas liquids revenue |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 3,987 | 2,034
Canada | Net natural gas revenue |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 51,581 | 39,373
Canada Offshore | Net crude oil and condensate revenue |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | 18,062 | 24,614
Other | Net crude oil and condensate revenue |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue from contracts with customers | $ 0 | $ 1,864

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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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