Selected Balance Sheet Information (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Inventory [Line Items]
Liability for Uncertainty in Income Taxes, Noncurrent	$ 11,000	$ 15,000
Inventory:
Remotely operated vehicle parts and components	94,603	81,110
Other inventory, primarily raw materials	73,159	72,572
Total	167,762	153,682
Other current assets:
Prepaid expenses	60,274	61,984
Angolan bonds	6,369	6,416
Total	66,643	68,400
Other Assets, Noncurrent	98,319	104,255
Accrued liabilities:
Payroll and related costs	122,826	134,538
Accounts Payable, Other, Current	60,965	49,032
Income taxes payable	42,157	35,826
Current operating lease liability	18,311	18,781
Other	55,400	52,482
Total	$ 299,659	$ 290,659