Quarterly report pursuant to Section 13 or 15(d)

Acquisitions and Divestitures (Details)

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Acquisitions and Divestitures (Details)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jul. 31, 2018
USD ($)
Mar. 01, 2018
USD ($)
Nov. 30, 2018
USD ($)
Jul. 31, 2018
USD ($)
Mar. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
a
$ / shares
Sep. 30, 2017
USD ($)
$ / shares
Sep. 30, 2018
USD ($)
a
$ / shares
Sep. 30, 2017
USD ($)
$ / shares
Dec. 31, 2017
USD ($)
Feb. 28, 2018
USD ($)
Nov. 01, 2017
USD ($)
Sep. 29, 2017
USD ($)
a
Business Acquisition [Line Items]                          
Cash Received for Suspended Revenues Attributable to Acquired Properties   $ 355,000                      
Business Acquisition, Transaction Costs           $ 500,000   $ 500,000          
Capitalized Costs, Proved Properties           2,400,000 $ 1,600,000 2,400,000 $ 1,600,000        
Asset Retirement Obligation           3,800,000   3,800,000          
Proceeds from sales of assets, net               1,700,000          
Earnest Money Deposits [1]           0   0   $ 3,210,000      
Business Acquisition, Pro Forma Revenue           127,185,000 48,174,000 321,221,000 147,873,000        
Property, Plant and Equipment, Gross           1,015,703,000   1,015,703,000   590,375,000      
Amount Transferred from Escrow Account                     $ 2,500,000    
Escrow Distributed                     $ 700,000    
Amount Transferred from Escrow Account                         $ 7,100,000
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Net of Tax           $ 16,276,000 $ (6,939,000) $ 27,144,000 $ 44,051,000        
Business Acquisition, Pro Forma Earnings Per Share, Basic | $ / shares           $ 1.08 $ (0.46) $ 1.80 $ 2.94        
Business Acquisition, Pro Forma Earnings Per Share, Diluted | $ / shares           $ 1.06 $ (0.46) $ 1.78 $ 2.92        
Second Lien Facility           $ 200,000,000   $ 200,000,000   200,000,000     200,000,000
Hunt Acquisition [Member]                          
Business Acquisition [Line Items]                          
Other Payments to Acquire Businesses               $ 86,000,000          
Cash Paid on Date of Acquisition   84,400,000                      
Cash Paid on Date of Acquisition   82,955,000                      
Accumulated Costs, net of suspended revenues, for wells in which Hunt elected not to participate   13,778,000                      
Acreage, Net | a           9,700   9,700          
Working Capital Adjustments, Net $ (200,000)     $ (200,000)   $ (245,000)   $ (245,000)          
Cash Received for Suspended Revenues Attributable to Acquired Properties       1,448,000                  
Business Acquisition, Transaction Costs   96,978,000     $ 400,000         100,000      
Capitalized Costs, Proved Properties   82,443,000                      
Capitalized Costs, Unproved Properties   16,339,000                      
Asset Retirement Obligation   356,000                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net   96,978,000                      
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual         400,000                
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual         $ 200,000                
Devon Acquisition [Member]                          
Business Acquisition [Line Items]                          
Other Payments to Acquire Businesses                   205,000,000      
Cash Paid on Date of Acquisition   190,277,000                     $ 189,900,000
Acreage, Net | a                         19,600
Working Capital Adjustments, Net   (2,451,000)                      
Cash Received for Suspended Revenues Attributable to Acquired Properties               400,000          
Business Acquisition, Transaction Costs                         $ 1,000,000
Capitalized Costs, Proved Properties   42,866,000                      
Capitalized Costs, Unproved Properties   146,686,000                      
Asset Retirement Obligation   494,000                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net   197,345,000                      
Escrow Deposit                         $ 10,300,000
Earnest Money Deposits                   $ 3,200,000      
Additional working interests                       $ 700,000  
Property, Plant and Equipment, Gross   8,642,000                      
Amount Transferred from Escrow Account   9,519,000                      
Preliminary Purchase Price   $ 197,345,000                      
Mid-Continent Divestiture [Member]                          
Business Acquisition [Line Items]                          
Working Capital Adjustments, Net 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          
Pre-Tax Operating Income Attributable to Assets Sold           $ (200,000) $ (900,000) $ (1,600,000) $ (1,500,000)        
Subsequent Event [Member] | Mid-Continent Divestiture [Member]                          
Business Acquisition [Line Items]                          
Cash Paid to Buyer in Connection with Final Settlement     $ 500,000                    
Cash Paid for Suspended Revenues in Connection with FInal Settlement     $ 200,000                    
[1] Represents the amount remaining in the Escrow Account for the Devon Acquisition, which was utilized to fund the remaining liabilities due to Devon for the final settlement in March 2018 (see Note 3).