Annual report pursuant to Section 13 and 15(d)

Related Parties - Additional Information (Details)

v3.10.0.1
Related Parties - Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Related Party Transaction [Line Items]      
Principal $ 646,000 $ 889,790  
Airplane Services      
Related Party Transaction [Line Items]      
Related party transactions 1,300 1,200 $ 1,100
Marine Transportation and Logistic Services      
Related Party Transaction [Line Items]      
Related party transactions 200 200  
Payments to related party transactions 21,000 $ 22,800 17,300
Marine Transportation and Logistic Services | Maximum      
Related Party Transaction [Line Items]      
Related party transactions     $ 200
CEO and Largest Shareholder | Senior Second Lien Note Issuance      
Related Party Transaction [Line Items]      
Principal $ 8,000