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Long-Term Debt (Details Textuals)
1 Months Ended 3 Months Ended 6 Months Ended
Jan. 31, 2018
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
shares
May 30, 2018
USD ($)
Apr. 18, 2018
USD ($)
Dec. 31, 2017
USD ($)
Long Term Debt (Textuals) [Abstract]            
Interest in guarantor subsidiaries   100.00% 100.00%      
Extinguishment of Debt, Amount $ 40,800,000          
Future Interest Payable on Senior Secured Notes And Convertible Notes [1]   $ 292,591,000 $ 292,591,000     $ 316,818,000
Senior Secured Bank Credit Facility [Abstract]            
Line of Credit, Borrowing Base   1,050,000,000.00 1,050,000,000.00      
Line of Credit Facility, Current Borrowing Capacity   $ 1,050,000,000.00 $ 1,050,000,000.00      
Weighted average interest rate on Bank Credit Facility   4.70%        
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage     0.50%      
Senior Secured Debt to Consolidated EBITDAX   2.5        
Consolidated EBITDAX to Consolidated Interest Charges     1.25      
Current Ratio Requirement     1.0      
Convertible Debt [Abstract]            
Stock Issued During Period, Value, New Issues     $ 162,050,000      
Common Stock [Member]            
Convertible Debt [Abstract]            
Issued pursuant to notes conversion, shares | shares     55,249,999      
Stock Issued During Period, Value, New Issues     $ 55,000      
Senior Subordinated Notes            
Long Term Debt (Textuals) [Abstract]            
Debt Exchange, Amount 174,300,000          
Senior Subordinated Notes | 6 3/8% Senior Subordinated Notes due 2021            
Long Term Debt (Textuals) [Abstract]            
Debt Instrument, Interest Rate, Stated Percentage   6.375% 6.375%      
Debt Exchange, Amount 11,600,000          
Senior Subordinated Notes | 5 1/2% Senior Subordinated Notes due 2022            
Long Term Debt (Textuals) [Abstract]            
Debt Instrument, Interest Rate, Stated Percentage   5.50% 5.50%      
Debt Exchange, Amount 94,200,000          
Senior Subordinated Notes | 4 5/8% Senior Subordinated Notes due 2023            
Long Term Debt (Textuals) [Abstract]            
Debt Instrument, Interest Rate, Stated Percentage   4.625% 4.625%      
Debt Exchange, Amount 68,500,000          
Secured Debt | 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
Secured Debt   $ 455,668,000 $ 455,668,000     381,568,000
Debt Instrument, Interest Rate, Stated Percentage   9.25% 9.25%      
Secured Debt | 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%        
Secured Debt | 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%        
Secured Debt | 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%        
Convertible Debt | 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    
Convertible Debt | 3 1/2% Convertible Senior Notes Due 2024            
Long Term Debt (Textuals) [Abstract]            
Debt Instrument, Interest Rate, Stated Percentage   3.50% 3.50%      
Convertible Debt [Abstract]            
Debt Conversion, Original Debt, Amount   $ 84,700,000        
Convertible Debt   0 $ 0   $ 0 $ 84,650,000
Notes Exchange            
Long Term Debt (Textuals) [Abstract]            
Future Interest Payable on Senior Secured Notes And Convertible Notes   22,100,000 22,100,000      
Interest Payable   $ 3,600,000 $ 3,600,000      
[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 lesser 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 June 30, 2018 include $84.9 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.