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Long-Term Debt (Details Textuals)
1 Months Ended 2 Months Ended 3 Months Ended 9 Months Ended
Jan. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Sep. 30, 2018
USD ($)
shares
Aug. 31, 2018
USD ($)
Aug. 13, 2018
USD ($)
May 30, 2018
USD ($)
Apr. 18, 2018
USD ($)
Dec. 31, 2017
USD ($)
Long Term Debt (Textuals) [Abstract]                    
Interest in guarantor subsidiaries   100.00% 100.00%   100.00%          
Extinguishment of Debt, Amount $ 40,800,000                  
Future interest payable on senior secured notes [1]   $ 292,590,000 $ 292,590,000   $ 292,590,000         $ 316,818,000
Senior Secured Bank Credit Facility [Abstract]                    
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage         0.50%          
Line of Credit, Borrowing Base   615,000,000 615,000,000 $ 615,000,000   $ 1,050,000,000      
Line of Credit Facility, Current Borrowing Capacity   615,000,000 $ 615,000,000   $ 615,000,000   1,050,000,000      
Senior Secured Debt to Consolidated EBITDAX     2.5              
Consolidated EBITDAX to Consolidated Interest Charges         1.25          
Current Ratio Requirement         1.0          
Long-term Line of Credit   0 $ 0   $ 0         475,000,000
Convertible Debt [Abstract]                    
Stock Issued During Period, Value, New Issues         162,004,000          
Maximum Incurrence of Junior Lien Debt Permitted   $ 1,650,000,000 $ 1,650,000,000   $ 1,650,000,000   $ 1,200,000,000      
Common Stock [Member]                    
Convertible Debt [Abstract]                    
Issued pursuant to notes conversion, shares | shares         55,249,955          
Stock Issued During Period, Value, New Issues         $ 55,000          
6 3/8% Senior Subordinated Notes due 2021                    
Long Term Debt (Textuals) [Abstract]                    
Debt Instrument, Interest Rate, Stated Percentage   6.375% 6.375%   6.375%          
Debt Exchange, Amount 11,600,000                  
Long-term Debt, Gross   $ 203,545,000 $ 203,545,000   $ 203,545,000         215,144,000
5 1/2% Senior Subordinated Notes due 2022                    
Long Term Debt (Textuals) [Abstract]                    
Debt Instrument, Interest Rate, Stated Percentage   5.50% 5.50%   5.50%          
Debt Exchange, Amount 94,200,000                  
Long-term Debt, Gross   $ 314,662,000 $ 314,662,000   $ 314,662,000         408,882,000
4 5/8% Senior Subordinated Notes due 2023                    
Long Term Debt (Textuals) [Abstract]                    
Debt Instrument, Interest Rate, Stated Percentage   4.625% 4.625%   4.625%          
Debt Exchange, Amount 68,500,000                  
Long-term Debt, Gross   $ 307,978,000 $ 307,978,000   $ 307,978,000         376,501,000
9 1/4% Senior Secured Second Lien Notes Due 2022                    
Long Term Debt (Textuals) [Abstract]                    
Face value of notes 74,100,000                 381,600,000
Debt Instrument, Interest Rate, Stated Percentage   9.25% 9.25%   9.25%          
Long-term Debt, Gross   $ 455,668,000 $ 455,668,000   $ 455,668,000         381,568,000
5% Convertible Senior Notes Due 2023                    
Long Term Debt (Textuals) [Abstract]                    
Face value of notes 59,400,000                  
Convertible Debt [Abstract]                    
Debt Conversion, Original Debt, Amount       59,400,000            
Convertible Debt               $ 0    
3 1/2% Convertible Senior Notes Due 2024                    
Long Term Debt (Textuals) [Abstract]                    
Debt Instrument, Interest Rate, Stated Percentage   3.50% 3.50%   3.50%          
Long-term Debt, Gross   $ 0 $ 0   $ 0         84,650,000
Convertible Debt [Abstract]                    
Debt Conversion, Original Debt, Amount       $ 84,700,000            
Convertible Debt                 $ 0  
7 1/2% Senior Secured Second Lien Notes due 2024 [Member]                    
Long Term Debt (Textuals) [Abstract]                    
Face value of notes           $ 450,000,000        
Debt Instrument, Interest Rate, Stated Percentage   7.50% 7.50%   7.50%          
Long-term Debt, Gross   $ 450,000,000 $ 450,000,000   $ 450,000,000         $ 0
Year 2018 | Q3 [Member]                    
Senior Secured Bank Credit Facility [Abstract]                    
Total Debt to Consolidated EBITDAX   5.25                
Year 2018 | Q4 [Member]                    
Senior Secured Bank Credit Facility [Abstract]                    
Total Debt to Consolidated EBITDAX   5.25                
Year 2019                    
Senior Secured Bank Credit Facility [Abstract]                    
Total Debt to Consolidated EBITDAX   5.25                
Year 2020 [Member]                    
Senior Secured Bank Credit Facility [Abstract]                    
Total Debt to Consolidated EBITDAX   5.25                
Year 2021 [Member] | Q1 [Member]                    
Senior Secured Bank Credit Facility [Abstract]                    
Total Debt to Consolidated EBITDAX   4.50                
Year 2021 [Member] | Q2 [Member]                    
Senior Secured Bank Credit Facility [Abstract]                    
Total Debt to Consolidated EBITDAX   4.50                
Year 2021 [Member] | Q3 [Member]                    
Senior Secured Bank Credit Facility [Abstract]                    
Total Debt to Consolidated EBITDAX   4.50                
Debt Instrument, Redemption, Period One | 9 1/4% Senior Secured Second Lien Notes Due 2022                    
Long Term Debt (Textuals) [Abstract]                    
Debt Instrument, Redemption Price, Percentage     109.25%              
Debt Instrument, Redemption, Period One | 7 1/2% Senior Secured Second Lien Notes due 2024 [Member]                    
Long Term Debt (Textuals) [Abstract]                    
Debt Instrument, Redemption Price, Percentage     103.75%              
Initial Redemption Period With Proceeds From Equity Offering Member | 9 1/4% Senior Secured Second Lien Notes Due 2022                    
Long Term Debt (Textuals) [Abstract]                    
Debt Instrument, Redemption Price, Percentage     109.25%              
Debt Instrument, Percentage of Principal Amount Available To Be Redeemed     35.00%              
Initial Redemption Period With Proceeds From Equity Offering Member | 7 1/2% Senior Secured Second Lien Notes due 2024 [Member]                    
Long Term Debt (Textuals) [Abstract]                    
Debt Instrument, Redemption Price, Percentage     107.50%              
Debt Instrument, Percentage of Principal Amount Available To Be Redeemed     35.00%              
Initial Redemption Period With Make Whole Premium | 9 1/4% Senior Secured Second Lien Notes Due 2022                    
Long Term Debt (Textuals) [Abstract]                    
Debt Instrument, Redemption Price, Percentage     100.00%              
Initial Redemption Period With Make Whole Premium | 7 1/2% Senior Secured Second Lien Notes due 2024 [Member]                    
Long Term Debt (Textuals) [Abstract]                    
Debt Instrument, Redemption Price, Percentage     100.00%              
Senior Subordinated Notes                    
Long Term Debt (Textuals) [Abstract]                    
Debt Exchange, Amount $ 174,300,000                  
Notes Exchange                    
Long Term Debt (Textuals) [Abstract]                    
Future interest payable on senior secured notes   $ 20,600,000 $ 20,600,000   20,600,000          
Interest Payable   $ 3,300,000 $ 3,300,000   $ 3,300,000          
[1] Future interest payable represents most of the interest due over the terms of our 9% Senior Secured Second Lien Notes due 2021 (the “2021 Senior Secured Notes”), 9¼% Senior Secured Second Lien Notes due 2022 (the “2022 Senior Secured Notes”), and to a small extent our previously outstanding 3½% Convertible Senior Notes due 2024 (the “2024 Convertible Senior Notes”) and has been accounted for as debt in accordance with FASC 470-60, Troubled Debt Restructuring by Debtors. Our current maturities of long-term debt as of September 30, 2018 include $102.2 million of future interest payable related to the 2021 Senior Secured Notes and 2022 Senior Secured Notes that is due within the next twelve months. See January 2018 Note Exchanges below for further discussion.