Quarterly report pursuant to Section 13 or 15(d)

Acquisitions and Divestitures (Details)

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Acquisitions and Divestitures (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended
Jul. 31, 2018
Nov. 30, 2018
Jul. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Mar. 31, 2018
Mar. 01, 2018
Dec. 31, 2017
Sep. 29, 2017
Business Acquisition [Line Items]                        
Capitalized Costs, Proved Properties       $ 2,400,000   $ 3,200,000 $ 2,400,000          
Asset Retirement Obligation           4,800,000            
Business Acquisition, Transaction Costs           500,000            
Proceeds from sales of assets, net           1,700,000            
Business Acquisition, Pro Forma Revenue             321,221,000          
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Net of Tax             $ 26,162,000          
Business Acquisition, Pro Forma Earnings Per Share, Basic             $ 1.74          
Business Acquisition, Pro Forma Earnings Per Share, Diluted             $ 1.71          
Second Lien Facility           200,000,000   $ 200,000,000       $ 200,000,000
Working Interests Acquisition [Member] [Domain]                        
Business Acquisition [Line Items]                        
Cash Paid on Date of Acquisition           6,000,000            
Hunt Acquisition [Member]                        
Business Acquisition [Line Items]                        
Application of working capital adjustments $ 200,000   $ 200,000             $ 245,000    
Capitalized Costs, Proved Properties                   82,443,000    
Asset Retirement Obligation                   356,000    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net                   96,978,000    
Net Cash Paid on Date of Acquisition                   82,955,000    
Payments to Acquire Business           $ 86,000,000.0            
Cash Paid on Date of Acquisition                   84,400,000    
Accumulated Costs, net of suspended revenues, for wells in which Hunt elected not to participate                   13,778,000    
Business Acquisition, Transaction Costs                 $ 400,000 96,978,000 $ 100,000  
Capitalized Costs, Unproved Properties                   $ 16,339,000    
Cash Received for Suspended Revenues Attributable to Acquired Properties     1,448,000                  
Mid-Continent Divestiture [Member]                        
Business Acquisition [Line Items]                        
Application of working capital adjustments (1,300,000)   (1,300,000)                  
Asset Retirement Obligation 300,000   $ 300,000                  
Proceeds from sales of assets, net $ 6,200,000       $ 6,000,000.0              
Cash Paid to Buyer in Connection with Final Settlement   $ 500,000                    
Cash Paid for Suspended Revenues in Connection with FInal Settlement   $ 200,000                    
Pre-Tax Operating Income Attributable to Assets Sold       $ 200,000     $ (1,600,000)