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Accounts Payable and Accrued Expenses (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Accounts Payable and Accrued Liabilities, Current [Abstract]    
Accounts payable and other accrued expenses $ 461,067 $ 313,901
Accrued interest 92,125 53,388
Production payable 97,245 59,825
Drilling advances 68,742 36,637
Payroll and benefits 29,811 26,402
Convertible perpetual preferred stock dividends 16,572 16,572
Related party 982 59
Total accounts payable and accrued expenses $ 766,544 $ 506,784