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Long-Term Debt (Details Textuals)
3 Months Ended
Feb. 17, 2016
USD ($)
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
May. 04, 2016
USD ($)
Apr. 18, 2016
USD ($)
Long Term Debt (Textuals) [Abstract]          
Interest in guarantor subsidiaries   100.00%      
Senior Secured Bank Credit Facility [Abstract]          
Weighted average interest rate on Bank Credit Facility   2.40%      
Senior Notes [Abstract]          
Gains (Losses) on Extinguishment of Debt   $ 94,991,000 $ 0    
Debt Instrument, Repurchase Amount   $ 55,500,000      
Year 2016          
Senior Secured Bank Credit Facility [Abstract]          
Senior Secured Debt to EBITDAX 3.0        
EBITDAX to Consolidated Interest 1.25        
Year 2017          
Senior Secured Bank Credit Facility [Abstract]          
Senior Secured Debt to EBITDAX 3.0        
EBITDAX to Consolidated Interest 1.25        
Q1 | Year 2018          
Senior Secured Bank Credit Facility [Abstract]          
Total Net Debt to EBITDAX Requirement   6.0      
Q1 | Year 2019          
Senior Secured Bank Credit Facility [Abstract]          
Total Net Debt to EBITDAX Requirement   4.25      
Q2 | Year 2018          
Senior Secured Bank Credit Facility [Abstract]          
Total Net Debt to EBITDAX Requirement   5.5      
Q3 | Year 2018          
Senior Secured Bank Credit Facility [Abstract]          
Total Net Debt to EBITDAX Requirement   5.0      
Q4 | Year 2018          
Senior Secured Bank Credit Facility [Abstract]          
Total Net Debt to EBITDAX Requirement   5.0      
Line of Credit          
Senior Secured Bank Credit Facility [Abstract]          
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.50%        
5 1/2% Senior Subordinated Notes due 2022          
Senior Notes [Abstract]          
Debt Instrument, Repurchased Face Amount   $ 42,300,000      
6 3/8% Senior Subordinated Notes due 2021          
Senior Notes [Abstract]          
Debt Instrument, Repurchased Face Amount   4,000,000      
4 5/8% Senior Subordinated Notes due 2023          
Senior Notes [Abstract]          
Debt Instrument, Repurchased Face Amount   $ 106,000,000      
Subsequent Event          
Senior Secured Bank Credit Facility [Abstract]          
Line of Credit, Borrowing Base         $ 1,050,000,000.00
Line of Credit Facility, Current Borrowing Capacity         1,050,000,000
Maximum amount of junior lien debt permitted         $ 1,000,000,000.0
Senior Notes [Abstract]          
Stock Repurchase Program, Remaining Authorized Repurchase Amount       $ 169,500,000  
Cash and Cash Equivalents [Member] | Line of Credit          
Senior Secured Bank Credit Facility [Abstract]          
Credit Facility Covenants $ 225,000,000        
Maximum Outstanding Credit Facility Balance [Member] | Line of Credit          
Senior Secured Bank Credit Facility [Abstract]          
Credit Facility Covenants 250,000,000        
Senior Subordinated Notes [Member] | Line of Credit          
Senior Secured Bank Credit Facility [Abstract]          
Credit Facility Covenants $ 225,000,000        
Base Rate [Member] | Line of Credit | Minimum          
Senior Secured Bank Credit Facility [Abstract]          
Interest Rate Margins on Bank Credit Facility 1.00%        
Base Rate [Member] | Line of Credit | Maximum          
Senior Secured Bank Credit Facility [Abstract]          
Interest Rate Margins on Bank Credit Facility 2.00%        
London Interbank Offered Rate (LIBOR) [Member] | Line of Credit | Minimum          
Senior Secured Bank Credit Facility [Abstract]          
Interest Rate Margins on Bank Credit Facility 2.00%        
London Interbank Offered Rate (LIBOR) [Member] | Line of Credit | Maximum          
Senior Secured Bank Credit Facility [Abstract]          
Interest Rate Margins on Bank Credit Facility 3.00%