Quarterly report pursuant to Section 13 or 15(d)

Property, Plant and Equipment Impairment (Details)

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Property, Plant and Equipment Impairment (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
business_line
Sep. 30, 2017
USD ($)
Property, Plant and Equipment [Abstract]        
Number of business lines | business_line     2  
Property, Plant and Equipment [Line Items]        
Loss on impairment $ 43,990 $ 0 $ 43,990 $ 0
Barge Rigs | Gulf Of Mexico        
Property, Plant and Equipment [Line Items]        
Long-lived assets carrying amount prior to impairment 19,700   19,700  
Loss on impairment 34,200      
Barge Rigs | International        
Property, Plant and Equipment [Line Items]        
Long-lived assets carrying amount prior to impairment 3,400   $ 3,400  
Loss on impairment $ 9,800