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Installment Receivable (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Installment Receivable      
Long-term installment receivable $ 6,924    
Revenue 546,896 $ 249,346 $ 239,143
Interest income on capital lease transactions 700    
Predecessor      
Installment Receivable      
Installment receivable, current   0  
Capital lease revenue or maintenance revenue   $ 0 $ 0
Maintenance      
Installment Receivable      
Revenue 1,000    
Sales type lease | Superior Transaction      
Installment Receivable      
Installment receivable, current 3,700    
Long-term installment receivable $ 6,900