Leases (Summary of Other Lease Information) (Details) - USD ($) $ in Thousands	6 Months Ended
	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