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Exploratory Well Costs (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2014
CapitalizedExploratoryWellCostsAbstract [Line Items]  
Balance at December 31, 2013 $ 9,211
Additions Pending the Determination of Proved Reserves 39,159
Reclassifications to Proved Properties (12,907)
Costs Charged to Expense (3,901)
Foreign Currency Translations 0
Balance at June 30, 2014 $ 31,562