Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Narrative (Details)

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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]      
Deposit to property acquisition $ 6.1    
Remaining payments 45.2    
Investment company, committed capital 3.7    
Supplies expense, estimated indirect benefit to the former executive officer 0.4 $ 0.0  
Letters of credit 1.5   $ 1.8
SandCo      
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]      
Supplies expense $ 22.1 $ 0.0  
Former executive officer | LandCo      
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]      
Noncontrolling interest ownership (in percentage) 44.00%