Quarterly report pursuant to Section 13 or 15(d)

Transactions with Related Parties - Narrative (Details)

v3.10.0.1
Transactions with Related Parties - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Apr. 27, 2017
Related Party Transaction [Line Items]            
Overhead costs       $ 1,500,000    
Rosemore, Inc.            
Related Party Transaction [Line Items]            
Overhead costs $ 0 $ 200,000   600,000    
Reimbursement of related party transaction expenses           $ 2,400,000
Tema            
Related Party Transaction [Line Items]            
Due to related parties, current (less than $0.1 million at Sep/Dec) 100,000   $ 100,000   $ 100,000  
Reimbursement of related party transaction expenses           $ 1,600,000
Gateway Gathering and Marketing Company            
Related Party Transaction [Line Items]            
Revenue from related parties 56,700,000 11,400,000 181,200,000 36,200,000    
Due from related parties, current 16,700,000   16,700,000   13,600,000  
Gateway Gathering and Marketing Company | Marketing and gathering agreement            
Related Party Transaction [Line Items]            
Due to related parties, current (less than $0.1 million at Sep/Dec) 0   0   $ 200,000  
Costs and expenses, related party $ 900,000 300,000 $ 2,500,000 800,000    
Rosehill Operating | Rosemore, Inc.            
Related Party Transaction [Line Items]            
Overhead costs   $ 3,100,000   $ 5,900,000