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Selected Balance Sheet Information (Details 2) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2021
Equity Method Investment, Summarized Financial Information [Abstract]    
Schedule of Other Assets and Other Liabilities [Table Text Block]
The following is information regarding selected balance sheet accounts:
 
 December 31,
(in thousands)20212020
Inventory, net:
Remotely operated vehicle parts and components$72,572 $62,788 
Other inventory, primarily raw materials81,110 78,453 
Total$153,682 $141,241 
Other current assets:
Prepaid expenses$62,171 $48,616 
Angolan bonds6,229 10,179 
Total$68,400 $58,795 
Other noncurrent assets:
Cash surrender value of life insurance policies$41,922 $39,562 
Investment in unconsolidated affiliates30,502 34,166 
Intangible assets, net12,641 14,317 
Other19,190 20,205 
Total$104,255 $108,250 
Accrued liabilities:
Payroll and related costs$134,538 $135,042 
Accrued job costs49,032 47,721 
Income taxes payable35,826 35,929 
Current operating lease liability18,781 18,798 
Other52,482 55,373 
Total$290,659 $292,863 
Other long-term liabilities:
Supplemental Executive Retirement Plan$35,195 $33,982 
Uncertain tax positions14,830 15,010 
Long-Term Incentive Plan11,996 12,640 
Deferred income taxes1,375 2,993 
Other26,708 24,619 
Total$90,104 $89,244 
  
Schedule of Equity Method Investments [Line Items]    
Inventory $ 141,241 $ 153,682
Other Inventory, Net of Reserves 78,453 81,110
Prepaid Expense, Current 48,616 62,171
Other current assets 58,795 68,400
Intangible Assets, Net (Excluding Goodwill) 14,317 12,641
Cash surrender value of life insurance policies 39,562 41,922
Equity Method Investments 34,166 30,502
Other 20,205 19,190
Other non-current assets 108,250 104,255
Payroll and related costs 135,042 134,538
Accrued job costs 47,721 49,032
Accrued Income Taxes, Current 35,929 35,826
Other 55,373 52,482
Accrued Liabilities, Current 292,863 290,659
Supplemental Executive Retirement Plan 33,982 35,195
Long-Term Incentive Plan 12,640 11,996
Liability for Uncertainty in Income Taxes, Noncurrent 15,010 14,830
Other 24,619 26,708
Other Long-term Liabilities 89,244 90,104
Liabilities, Other than Long-term Debt, Noncurrent $ 89,244 $ 90,104