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Restructuring Costs (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Restructuring and Related Activities [Abstract]  
Retention Bonuses Related To Discontinued Operations $ 10.4qep_RetentionBonusesRelatedToDiscontinuedOperations
Estimated restructuring costs $ 7.9us-gaap_RestructuringAndRelatedCostExpectedCost1