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Leases - Summary of Other Lease Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | [1]
Cash paid for amounts included in the measurement of lease liabilities: |  |  |
Operating cash flows from operating leases | $ 160,385 | $ 193,968 |
Operating cash flows from finance leases | 372 | 408 |
Financing cash flows from finance leases | 695 | 688 | $ 318
Right-of-use assets obtained in exchange for lease liabilities: |  |  |
Operating leases | 453,719 | $ 125,026 |
Cascade/Chinook FPSO, Gulf of Mexico |  |  |
Right-of-use assets obtained in exchange for lease liabilities: |  |  |
Operating leases | $ 268,800 |  |
Lease term | 5 years |  |
Canadian gas plant expansion |  |  |
Right-of-use assets obtained in exchange for lease liabilities: |  |  |
Operating leases | $ 168,400 |  |
Lease term | 20 years |  |
[1] | Reclassified to conform with current presentation

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