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Related Party Transactions - Payments, Acquisition and Debt (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Jul. 31, 2017
Jun. 30, 2017
May 31, 2017
Apr. 30, 2017
Feb. 28, 2017
Jan. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Related Party Transactions                  
Accounts payable, related party               $ 2.4  
Liability payable             $ 3.0    
Increase in borrowings on related party debt             21.0    
CSL and Board Members                  
Related Party Transactions                  
Related party expenses             1.4 $ 0.2 $ 0.1
Accounts payable, related party             0.0    
CSL | Allied Purchase Agreement                  
Related Party Transactions                  
Assets purchased from a related party           $ 4.0      
Ranger Bridge Loan                  
Related Party Transactions                  
Related party note payable $ 21.0 $ 17.1   $ 12.1 $ 11.1        
Carrying value of assets used to secure debt             $ 132.1    
Interest rate (as a percent)         15.00%        
Period after the consummation of an initial public offering that the debt may become due         10 days        
Percentage of the total amount advanced to be paid upon settlement         125.00%        
Increase in borrowings on related party debt $ 3.9 $ 2.5 $ 2.5 $ 1.0          
Ranger Bridge Loan | CSL Opportunities II                  
Related Party Transactions                  
Related party note payable         $ 4.4        
Ranger Bridge Loan | CSL Holdings II                  
Related Party Transactions                  
Related party note payable         3.2        
Ranger Bridge Loan | Bayou Well Holdings Company, LLC                  
Related Party Transactions                  
Related party note payable         $ 3.6