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FINANCIAL STATEMENT PRESENTATION - Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jul. 27, 2018
Nov. 16, 2017
Sep. 30, 2019
Sep. 30, 2019
Chairman, Chief Executive Officer and President        
Related Party Transactions        
Amount incurred       $ 0.2
SCM Crude, LLC        
Related Party Transactions        
Term 15 years      
Amount earned     $ 24.7 101.6
Receivable from related party     0.0 0.0
Minimum percentage of funds controlled by related party 10.00%      
Salt Creek Midstream, LLC        
Related Party Transactions        
Term   15 years    
Amount earned     2.9 6.0
Receivable from related party     1.5 1.5
Minimum percentage of funds controlled by related party   10.00%    
Cima        
Related Party Transactions        
Amount incurred     0.3 0.9
Cima | Accounts payable and accrued liabilities | Maximum        
Related Party Transactions        
Amount payable     $ 0.1 $ 0.1