Leases (Summary of Other Lease Information) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 53,039	$ 44,730
Operating cash flows from finance leases	102	102
Financing cash flows from finance leases	168	160
Right-of-use assets obtained in exchange for lease liabilities:
Operating leases	274,237	$ 311
Cascade/Chinook FPSO
Right-of-use assets obtained in exchange for lease liabilities:
Operating leases	$ 268,800
Lease term	5 years