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Impairment of Long-lived Assets (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
Dec. 31, 2017
USD ($)
Tugboat
Towboat
TankBarge
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Impairment Effects on Earnings Per Share [Line Items]        
Non-cash pre-tax impairment charge $ 105,712 $ 105,712 $ 0 $ 0
Impairment charge after tax effect $ 66,975      
Impairment charge after tax effect on earning per share (in dollars per share) | $ / shares $ 1.20      
Vessels [Member]        
Impairment Effects on Earnings Per Share [Line Items]        
Fair market value of assets $ 12,550 $ 12,550    
Coastal Tank Barge [Member]        
Impairment Effects on Earnings Per Share [Line Items]        
Number of vessels to be disposed of | TankBarge   12    
Coastal Tugboats [Member]        
Impairment Effects on Earnings Per Share [Line Items]        
Number of vessels to be disposed of | Tugboat   21    
Inland Towboats [Member]        
Impairment Effects on Earnings Per Share [Line Items]        
Number of vessels to be disposed of | Towboat   6