Leases - Summary of Other Lease Information (Details) - USD ($) $ in Thousands	12 Months Ended
	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