Quarterly report pursuant to Section 13 or 15(d)

Investments, At Equity, And Advances To 50% Or Less Owned Companies (Narrative) (Details)

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Investments, At Equity, And Advances To 50% Or Less Owned Companies (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Schedule Of Equity Method Investments [Line Items]        
Equity in Earnings (Losses) of 50% or Less Owned Companies, Net of Tax $ (322) $ 5,123 $ (7,533) $ 10,086
Asset Impairment Charges     51,700 $ 6,900
Guarantor Obligations, Maximum Exposure, Undiscounted 1,600   1,600  
Allocable Share of Uncalled Capital 1,800   1,800  
Falcon Global [Member]        
Schedule Of Equity Method Investments [Line Items]        
Partners' Capital Account, Contributions     6,800  
OSV Partners [Member]        
Schedule Of Equity Method Investments [Line Items]        
Partners' Capital Account, Contributions     1,200  
Other Offshore Marine Services Joint Ventures [Member]        
Schedule Of Equity Method Investments [Line Items]        
Partners' Capital Account, Contributions     200  
Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital     400  
Asset Impairment Charges     300  
Guarantor Obligations, Maximum Exposure, Undiscounted 83,400   83,400  
SCFCo Holdings [Member]        
Schedule Of Equity Method Investments [Line Items]        
Partners' Capital Account, Contributions     800  
Outstanding Working Capital Advances At End Of Period 27,600   27,600  
Sea-Access [Member]        
Schedule Of Equity Method Investments [Line Items]        
Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital     2,000  
Partners' Capital Account, Return of Capital     8,400  
Seajon [Member]        
Schedule Of Equity Method Investments [Line Items]        
Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital     600  
Avion Pacific Limited [Member]        
Schedule Of Equity Method Investments [Line Items]        
Outstanding Working Capital Advances At End Of Period 3,000   3,000  
Payments for Advance to Affiliate     3,000  
VA&E [Member]        
Schedule Of Equity Method Investments [Line Items]        
Outstanding Working Capital Advances At End Of Period 8,300   8,300  
Line of Credit Facility, Maximum Borrowing Capacity 6,000   6,000  
Proceeds from Unsecured Lines of Credit     10,000  
Repayments of Long-term Lines of Credit     (8,900)  
Other Corporate Joint Ventures [Member]        
Schedule Of Equity Method Investments [Line Items]        
Payments for Advance to Affiliate     600  
Offshore Support Vessels [Member] | OSV Partners [Member]        
Schedule Of Equity Method Investments [Line Items]        
Equity in Earnings (Losses) of 50% or Less Owned Companies, Net of Tax     1,000  
Offshore Support Vessels [Member] | Other Offshore Marine Services Joint Ventures [Member]        
Schedule Of Equity Method Investments [Line Items]        
Equity in Earnings (Losses) of 50% or Less Owned Companies, Net of Tax     2,700  
Long-term Debt [Member] | VA&E [Member]        
Schedule Of Equity Method Investments [Line Items]        
Outstanding Working Capital Advances At End Of Period 1,100   1,100  
Subordinated Debt [Member] | VA&E [Member]        
Schedule Of Equity Method Investments [Line Items]        
Outstanding Working Capital Advances At End Of Period $ 1,000   $ 1,000