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Property, Plant and Equipment - Capitalized Costs of Unproved Properties Excluded from Amortization (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Property, Plant and Equipment [Abstract]        
Property acquisition, cumulative $ 247,485us-gaap_AcquisitionCostsCumulative     $ 62,456us-gaap_AcquisitionCostsCumulative
Property acquisition 64,776us-gaap_AcquisitionCosts 21,723us-gaap_AcquisitionCosts 98,530us-gaap_AcquisitionCosts  
Exploration, cumulative 96,752us-gaap_ExplorationCostsCumulative [1]     6,898us-gaap_ExplorationCostsCumulative [1]
Exploration 48,614us-gaap_ExplorationCosts [1] 36,938us-gaap_ExplorationCosts [1] 4,302us-gaap_ExplorationCosts [1]  
Total costs incurred, cumulative 344,237sd_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationIncludingPipeInventoryCostCumulative     69,354sd_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationIncludingPipeInventoryCostCumulative
Total costs incurred $ 113,390sd_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationIncludingPipeInventoryCost $ 58,661sd_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationIncludingPipeInventoryCost $ 102,832sd_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationIncludingPipeInventoryCost  
[1] Includes $53.6 million of pipe inventory costs incurred ($21.3 million in 2014, $30.7 million in 2013 and $1.6 million in 2012 and prior years).