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Revenue from Contracts with Customers (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Total revenue from contracts with customers | $ 646,114 |  | $ 426,767 | [1] | $ 1,236,664 | $ 823,096 | [1]
Gain (loss) on crude contracts | 57,916 | [2] | (37,624) | [1] | 57,916 | (67,126) | [1]
Gain on sale of assets and other income | 5,019 |  | 437 | [1] | 5,473 | 8,400 | [1]
Total revenues | 709,049 |  | 389,580 | [1] | 1,300,053 | 764,370 | [1]
Net crude oil and condensate revenue |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Total revenue from contracts with customers | 597,484 |  | 369,958 |  | 1,121,139 | 699,744 |
Net natural gas liquids revenue |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Total revenue from contracts with customers | 12,143 |  | 19,603 |  | 25,918 | 36,845 |
Net natural gas revenue |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Total revenue from contracts with customers | 36,487 |  | 37,206 |  | 89,607 | 86,507 |
United States | Net crude oil and condensate revenue |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Total revenue from contracts with customers | 192,182 |  | 198,823 |  | 325,772 | 381,472 |
United States | Net natural gas liquids revenue |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Total revenue from contracts with customers | 6,384 |  | 13,236 |  | 12,525 | 25,370 |
United States | Net natural gas revenue |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Total revenue from contracts with customers | 5,533 |  | 6,292 |  | 11,397 | 13,062 |
United States Offshore | Net crude oil and condensate revenue |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Total revenue from contracts with customers | 334,189 |  | 94,393 |  | 650,212 | 165,922 |
United States Offshore | Net natural gas liquids revenue |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Total revenue from contracts with customers | 2,988 |  | 2,920 |  | 7,164 | 4,559 |
United States Offshore | Net natural gas revenue |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Total revenue from contracts with customers | 6,643 |  | 2,825 |  | 9,149 | 5,762 |
Canada | Net crude oil and condensate revenue |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Total revenue from contracts with customers | 26,472 |  | 28,426 |  | 53,816 | 49,719 |
Canada | Net natural gas liquids revenue |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Total revenue from contracts with customers | 2,771 |  | 3,447 |  | 6,229 | 6,916 |
Canada | Net natural gas revenue |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Total revenue from contracts with customers | 24,311 |  | 28,089 |  | 69,061 | 67,683 |
Canada Offshore | Net crude oil and condensate revenue |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Total revenue from contracts with customers | 41,518 |  | 48,316 |  | 85,364 | 102,631 |
Other | Net crude oil and condensate revenue |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |
Total revenue from contracts with customers | $ 3,123 |  | $ 0 |  | $ 5,975 | $ 0 |
[1] | Reclassified to conform to current presentation (see Note A).
[2] | Reclassified to conform to current presentation (see Note A).

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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