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Accounts Payable and Accrued Expenses (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Accounts Payable and Accrued Liabilities, Current [Abstract]    
Accounts payable and other accrued expenses $ 341,008 $ 461,067
Accrued interest 80,740 92,125
Production payable 127,647 97,245
Drilling advances 184,203 68,742
Payroll and benefits 59,785 29,811
Convertible perpetual preferred stock dividends 16,572 16,572
Related party 2,533 982
Total accounts payable and accrued expenses $ 812,488 $ 766,544