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Revenue from Contracts with Customers (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | $ 606,954 | $ 509,035 | [1]
Gain (loss) on crude contracts | (29,502) | 37,077 | [1]
Other operating income (loss) | 8,492 | (1,454) |
Gain (loss) on sale of assets | (339) | 131,982 |
Total revenues | 585,605 | 676,640 | [1]
Crude Oil And Condensate [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 501,663 | 403,548 |
Natural Gas Liquids [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 23,434 | 17,177 |
Natural Gas [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 81,857 | 88,310 |
United States Onshore [Member] | Crude Oil And Condensate [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 182,649 | 149,986 |
United States Onshore [Member] | Natural Gas Liquids [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 12,134 | 9,647 |
United States Onshore [Member] | Natural Gas [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 6,770 | 7,036 |
United States Offshore [Member] | Crude Oil And Condensate [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 71,528 | 53,813 |
United States Offshore [Member] | Natural Gas Liquids [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 1,639 | 1,916 |
United States Offshore [Member] | Natural Gas [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 2,937 | 2,663 |
Canada Onshore [Member] | Crude Oil And Condensate [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 21,293 | 9,121 |
Canada Onshore [Member] | Natural Gas Liquids [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 3,469 | 432 |
Canada Onshore [Member] | Natural Gas [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 39,594 | 39,847 |
Canada Offshore [Member] | Crude Oil And Condensate [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 54,315 | 37,014 |
Malaysia - Sarawak [Member] | Crude Oil And Condensate [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 77,306 | 65,783 |
Malaysia - Sarawak [Member] | Natural Gas Liquids [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 6,192 | 5,182 |
Malaysia - Sarawak [Member] | Natural Gas [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 32,383 | 38,589 |
Malaysia - Block K [Member] | Crude Oil And Condensate [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | 94,572 | 87,831 |
Malaysia - Block K [Member] | Natural Gas [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue from contracts with customers | $ 173 | $ 175 |
[1] | Reclassified to conform to current presentation (see Notes A and B).

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 32 -Paragraph 2A -URI http://asc.fasb.org/extlink&oid=82859839&loc=SL82860478-203043 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130543-203045 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130539-203045 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045 + Details
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