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Subsequent Events (Details) - USD ($)
$ in Millions
Feb. 14, 2019
Sep. 21, 2018
Subsequent Event | Seller financed loan due February 2023    
Subsequent Event [Line Items]    
Financed value $ 53.8  
Subsequent Event | Seller Financing | Seller financed loan due February 2023    
Subsequent Event [Line Items]    
Cash paid to acquire asset 30.1  
Rig    
Subsequent Event [Line Items]    
Purchase price of asset acquired   $ 93.8
Rig | Subsequent Event    
Subsequent Event [Line Items]    
Purchase price of asset acquired $ 83.8