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Related Parties - Transportation Agreement with Monarch Oil Pipeline LLC (Details)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Sep. 01, 2013
May 07, 2013
Sep. 30, 2014
Mar. 31, 2017
USD ($)
MMBoe
director
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
MMBoe
Dec. 31, 2014
USD ($)
MMBoe
Related Party Transactions              
Oil and gas sales       $ 40,677 $ 25,080    
Cash distributions associated with equity interests       17,500      
Monarch Oil Pipeline LLC | Investee              
Related Party Transactions              
Term of Oil Gathering and Transportation Agreement (in years)     10 years        
Gathering fees       $ 700      
Oil production transported (in MMBoe) | MMBoe       0.3      
Monarch Natural Gas, LLC | Investee              
Related Party Transactions              
Oil production transported (in MMBoe) | MMBoe           1.0 1.4
Oil and gas sales           $ 10,600 $ 37,000
Enable Midstream Partners LP              
Related Party Transactions              
Initial term of the agreement (in years) 10 years            
Metalmark | Beneficial owner              
Related Party Transactions              
Number of directors who are managing directors of the related party | director       2      
Metalmark | Monarch Natural Gas, LLC | Investee              
Related Party Transactions              
Metalmark Capital's ownership percentage in Monarch (as a percent)   81.00%          
Minimum | Metalmark | Beneficial owner              
Related Party Transactions              
Beneficial ownership interest (as a percent)       5.00%