Annual report pursuant to Section 13 and 15(d)

Noncontrolling Interests in Subsidiaries (Details)

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Noncontrolling Interests in Subsidiaries (Details) - USD ($)
$ in Thousands
3 Months Ended 7 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Jul. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Noncontrolling Interest [Line Items]                        
Noncontrolling interests in subsidiaries $ 788       $ 149,688         $ 788 $ 149,688  
Net Income $ (1,912) $ 5,861 $ 17,001 $ 13,068 4,434 $ 27,203 $ 46,007 $ 5,558   34,018 83,202 $ 81,709
Net income attributable to noncontrolling interest                   $ 7,244 25,054 20,066
SEA-Vista | Ocean Services                        
Noncontrolling Interest [Line Items]                        
Noncontrolling interest, ownership percentage by noncontrolling owners 49.00%                 49.00%    
Noncontrolling interests in subsidiaries $ 0       148,665         $ 0 148,665  
Other Inland River Services Noncontrolling Interests | Inland Services                        
Noncontrolling Interest [Line Items]                        
Noncontrolling interests in subsidiaries $ 785       862         $ 785 862  
Other Inland River Services Noncontrolling Interests | Minimum | Inland Services                        
Noncontrolling Interest [Line Items]                        
Noncontrolling interest, ownership percentage by noncontrolling owners 3.00%                 3.00%    
Other Inland River Services Noncontrolling Interests | Maximum | Inland Services                        
Noncontrolling Interest [Line Items]                        
Noncontrolling interest, ownership percentage by noncontrolling owners 51.80%                 51.80%    
Other Noncontrolling Interests | Other                        
Noncontrolling Interest [Line Items]                        
Noncontrolling interest, ownership percentage by noncontrolling owners 5.00%                 5.00%    
Noncontrolling interests in subsidiaries $ 3       $ 161         $ 3 161  
SEA-Vista | Ocean Services                        
Noncontrolling Interest [Line Items]                        
Net Income                 $ 14,800   51,200 45,900
Net income attributable to noncontrolling interest                 $ 7,200   $ 25,100 $ 22,500