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Commitments (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Commitments and Contingencies Disclosure [Line Items] |  |  |
Operating lease rental payments due in 2019 | $ 188,600 |  |
Operating lease rental payments due in 2020 | 88,900 |  |
Operating lease rental payments due in 2021 | 61,900 |  |
Operating lease rental payments due in 2022 | 27,600 |  |
Operating lease rental payments due in 2023 | 15,600 |  |
Rental expenses for non-cancellable lease, including contingent payments | 75,300 | $ 72,600 | $ 77,500
Commitments for capital expenditures | 383,100 |  |
Malaysia [Member] |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Commitments for capital expenditures | 103,000 |  |
Kaybob Duvernay Lands, Alberta [Member] |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Commitments for capital expenditures | 60,000 |  |
Eagle Ford Shale [Member] |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Commitments for capital expenditures | 31,400 |  |
Mexico [Member] |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Commitments for capital expenditures | 14,700 |  |
Gulf Of Mexico [Member] |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Commitments for capital expenditures | $ 165,200 |  |
Rig contract cancellation period | 30 days |  |
Vietnam [Member] |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Commitments for capital expenditures | $ 8,800 |  |
Drilling Rigs And Associated Equipment [Member] |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Commitments for capital expenditures | 57,900 |  |
Processing Production Handling and Transportation Services [Member] |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |
Operating lease rental payments due in 2019 | 116,800 |  |
Operating lease rental payments due in 2020 | 128,000 |  |
Operating lease rental payments due in 2021 | 145,300 |  |
Operating lease rental payments due in 2022 | 136,200 |  |
Operating lease rental payments due in 2023 | 123,700 |  |
Processing and transportation charges | $ 52,200 | $ 53,800 | $ 50,300

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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details
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- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
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- Definition The amount purchased during the period under an unrecorded unconditional purchase obligation (for example, under the take-or-pay or throughput contract). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=77896938&loc=d3e25336-109308 + Details
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