Quarterly report pursuant to Section 13 or 15(d)

Property, Plant and Equipment - Summary of Future Proceeds from Sale of Assets (Details)

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Property, Plant and Equipment - Summary of Future Proceeds from Sale of Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Sep. 10, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]      
Future proceeds from sale of assets $ 4,969   $ 0
Non-operating interests      
Property, Plant and Equipment [Line Items]      
Future proceeds from sale of assets   $ 4,940  
On or before December 31, 2019 | Non-operating interests      
Property, Plant and Equipment [Line Items]      
Future proceeds from sale of assets   3,705  
On or before March 31, 2020 | Non-operating interests      
Property, Plant and Equipment [Line Items]      
Future proceeds from sale of assets   $ 1,235