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Long-Term Debt Revolving Credit Facility (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
Oct. 21, 2015
Jun. 30, 2015
Dec. 31, 2014
Debt Instrument [Line Items]        
Long-term Line of Credit $ 184,000     $ 166,000
Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity 2,500,000      
Line of Credit Facility, Current Borrowing Capacity 1,500,000   $ 1,500,000  
Borrowing Base, Line of Credit $ 2,000,000   $ 2,400,000  
Percentage of Proved Property Secured for Credit Facility Borrowing 75.00%      
Line of Credit, Covenant Compliance, Maximum Annual Dividend Payment $ 50,000      
Long-term Line of Credit 184,000     166,000
Letters of Credit Outstanding, Amount [1] 200     808
Line of Credit Facility, Remaining Borrowing Capacity $ 1,315,800     $ 1,333,192
Subsequent Event [Member] | Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Long-term Line of Credit   $ 177,500    
Letters of Credit Outstanding, Amount [1]   200    
Line of Credit Facility, Remaining Borrowing Capacity   $ 1,322,300    
[1] Letters of credit reduce the amount available under the credit facility on a dollar-for-dollar basis.