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Additional Balance Sheet Details (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Accounts Payable and Accrued Liabilities, Current [Abstract]    
Accrued exploration and development costs $ 100,564 $ 109,939
Accrued interest 68,871 60,698
Accounts payable 63,263 86,051
Accrued lease operating expenses 59,762 23,862
Accrued compensation 55,043 48,451
Taxes payable 28,019 27,523
Other 35,021 58,144
Total $ 410,543 $ 414,668