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Properties and Equipment (Details 4) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Capitalized exploratory well costs        
Capitalized exploratory well costs that have been capitalized for a period of one year or less $ 10,557us-gaap_CapitalizedExploratoryWellCostsThatHaveBeenCapitalizedForPeriodOfOneYearOrLess $ 0us-gaap_CapitalizedExploratoryWellCostsThatHaveBeenCapitalizedForPeriodOfOneYearOrLess $ 10,390us-gaap_CapitalizedExploratoryWellCostsThatHaveBeenCapitalizedForPeriodOfOneYearOrLess  
Capitalized exploratory well costs that have been capitalized for a period greater than one year 0us-gaap_CapitalizedExploratoryWellCostsThatHaveBeenCapitalizedForPeriodGreaterThanOneYear 0us-gaap_CapitalizedExploratoryWellCostsThatHaveBeenCapitalizedForPeriodGreaterThanOneYear 0us-gaap_CapitalizedExploratoryWellCostsThatHaveBeenCapitalizedForPeriodGreaterThanOneYear  
Capitalized Exploratory Well Costs $ 10,557us-gaap_CapitalizedExploratoryWellCosts $ 0us-gaap_CapitalizedExploratoryWellCosts $ 10,390us-gaap_CapitalizedExploratoryWellCosts $ 5,328us-gaap_CapitalizedExploratoryWellCosts