Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Narrative (Details)

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Commitments and Contingencies - Narrative (Details)
$ in Millions
9 Months Ended
Oct. 03, 2019
USD ($)
Sep. 30, 2019
USD ($)
equipment
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Obligation with Joint and Several Liability Arrangement [Line Items]        
Deposit to property acquisition   $ 6.1    
Number of turbines | equipment   2    
Remaining payments   $ 21.5    
Capital commitments   1.6    
Supplies expense, estimated indirect benefit to the former executive officer   1.2 $ 0.1  
Letters of credit   1.5   $ 1.8
Accrued severance   $ 1.5    
Subsequent Event        
Obligation with Joint and Several Liability Arrangement [Line Items]        
Severance costs $ 0.5      
Former executive officer | LandCo        
Obligation with Joint and Several Liability Arrangement [Line Items]        
Noncontrolling interest, ownership (in percentage)   44.00%    
SandCo        
Obligation with Joint and Several Liability Arrangement [Line Items]        
Supplies expense   $ 36.8 $ 1.6