Annual report pursuant to Section 13 and 15(d)

Discontinued Operations (Details)

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Discontinued Operations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Costs and Expenses [Abstract]      
Net Income (Loss) $ 0 $ 0 $ (23,637)
Discontinued Operations      
Costs and Expenses [Abstract]      
Net Income (Loss)     (23,637)
Reportable Legal Entities | Discontinued Operations, Disposed of by Means Other than Sale, Spinoff | SEACOR Marine      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Operating Revenues     62,291
Costs and Expenses [Abstract]      
Operating     65,888
Administrative and general     29,682
Depreciation and amortization     22,181
Total costs and expenses     117,751
Gains on Asset Dispositions, Net     4,219
Operating Income (Loss)     (51,241)
Other Income, Net     1,780
Income Tax Expense (Benefit)     (12,931)
Equity in Earnings of 50% or Less Owned Companies, Net of Tax     1,663
Net Income (Loss)     (34,867)
Net Loss Attributable to Noncontrolling Interests     (1,892)
Reportable Legal Entities | Discontinued Operations, Disposed of by Sale | Illinois Corn Processing LLC      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Operating Revenues     78,061
Costs and Expenses [Abstract]      
Operating     76,306
Administrative and general     2,140
Depreciation and amortization     2,354
Total costs and expenses     80,800
Operating Income (Loss)     (2,739)
Other Income, Net     20,557
Income Tax Expense (Benefit)     7,818
Net Income (Loss)     10,000
Net Loss Attributable to Noncontrolling Interests     (539)
Eliminations | Discontinued Operations      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Operating Revenues     (1,176)
Costs and Expenses [Abstract]      
Operating     (1,289)
Administrative and general     (42)
Total costs and expenses     (1,331)
Operating Income (Loss)     155
Other Income, Net     1,738
Income Tax Expense (Benefit)     663
Net Income (Loss)     $ 1,230