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Other Assets (Narrative) (Details) (SM Energy Litigation [Member], USD $)
In Millions, unless otherwise specified
Apr. 16, 2014
SM Energy Litigation [Member]
  
Loss Contingencies [Line Items]  
Amount of deposit forfeited $ 6.0end_ForfeitedDepositAmount
/ us-gaap_LitigationCaseAxis
= end_SmEnergyLitigationMember