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Subsequent Events - RCM3 LLC (Details) - USD ($)
$ in Thousands
6 Months Ended
Jul. 26, 2017
Jun. 30, 2017
Jun. 30, 2016
Subsequent Event [Line Items]      
Payments to acquire membership interest   $ 0 $ 223
Subsequent Event | RMC6, LLC (RCM6) | Tinuum Group, LLC      
Subsequent Event [Line Items]      
Ownership interest, percent 49.90%    
Subsequent Event | RMC6, LLC (RCM6) | NexGen Refined Coal, LLC      
Subsequent Event [Line Items]      
Ownership interest, percent 0.10%    
Subsequent Event | RMC6, LLC (RCM6) | 3rd Party      
Subsequent Event [Line Items]      
Ownership interest, percent 49.90%    
Subsequent Event | RMC6, LLC (RCM6)      
Subsequent Event [Line Items]      
Ownership interest, percent 0.10%    
Payments to acquire membership interest $ 100