Selected Balance Sheet Information (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Inventory [Line Items]
Liability for Uncertainty in Income Taxes, Noncurrent	$ 12,000	$ 15,000
Inventory:
Remotely operated vehicle parts and components	95,403	81,110
Other inventory, primarily raw materials	73,842	72,572
Total	169,245	153,682
Other current assets:
Prepaid expenses	71,128	61,984
Angolan bonds	5,774	6,416
Total	76,902	68,400
Other Assets, Noncurrent	101,655	104,255
Accrued liabilities:
Payroll and related costs	124,723	134,538
Accounts Payable, Other, Current	48,683	49,032
Income taxes payable	39,382	35,826
Current operating lease liability	18,982	18,781
Other	54,812	52,482
Total	$ 286,582	$ 290,659