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Contingencies (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Movement in Standard and Extended Product Warranty Accrual, Increase (Decrease)    
Balance as of December 31, 2018 $ 1,528  
Product warranty accruals and adjustments 700  
Settlements (656)  
Balance as of September 30, 2019 1,572  
Loss Contingencies    
due to related party 23,852 $ 0
Long-term debt - affiliate 62,625 $ 86,478
Minimum    
Loss Contingencies    
Potential loss liability 65,000  
Maximum    
Loss Contingencies    
Potential loss liability $ 90,000