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Leases (Summary of Other Lease Information) (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020
Cash paid for amounts included in the measurement of lease liabilities: |  |
Operating cash flows from operating leases | $ 87,768 | $ 90,831
Operating cash flows from finance leases | 172 | 188
Financing cash flows from finance leases | 371 | 336
Right-of-use assets obtained in exchange for lease liabilities: |  |
Operating leases | 94,788 | 277,662
Minimum lease payments for leases signed but not yet commenced | $ 90,300 |
Lease duration for leases signed but not yet commenced | 16 months |
Cascade/Chinook FPSO |  |
Right-of-use assets obtained in exchange for lease liabilities: |  |
Operating leases |  | $ 268,800
Lease term |  | 5 years

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