Selected Balance Sheet Information (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Inventory [Line Items]
Liability for Uncertainty in Income Taxes, Noncurrent	$ 15,000	$ 12,000
Inventory:
Remotely operated vehicle parts and components	88,850	81,110
Other inventory, primarily raw materials	73,411	72,572
Total	162,261	153,682
Other current assets:
Prepaid expenses	60,825	62,171
Angolan bonds	6,229	6,229
Total	67,054	68,400
Other Assets, Noncurrent	101,986	104,255
Accrued liabilities:
Payroll and related costs	108,132	134,538
Accounts Payable, Other, Current	51,022	49,032
Income taxes payable	39,395	35,826
Current operating lease liability	20,021	18,781
Other	54,081	52,482
Total	$ 272,651	$ 290,659