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Equity-Based Compensation Schedule of Stock Option Transactions (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Stock options outstanding, beginning of year 1,794,187us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Options granted 282,236us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Options exercised (65,366)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Options forfeited (14,842)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
Stock options outstanding, end of year 1,996,215us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]  
Weighted average exercise price, beginning of year $ 27.90us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Weighted average exercise price, granted in period $ 31.67us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
Weighted average exercise price, exercised in period $ 22.24us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
Weighted average exercise price, forfeited in period $ 30.53us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice
Weighted average exercise price, end of year $ 28.60us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Options exercisable, shares 1,494,061us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
Options exercisable, weighted average exercise price $ 27.80us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
Unvested options, shares 502,154us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares
Unvested options, weighted average exercise price $ 30.98us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue
Weighted average remaining contractual term, options outstanding 3 years 2 months 4 days
Weighted average remaining contractual term, options exercisable 2 years 4 months 22 days
Weighted average remaining contractual term, options unvested 5 years 6 months 2 days
Aggregate intrinsic value, options outstanding $ 0.1us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
Aggregate intrinsic value, options exercisable 0.1us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
Aggregate intrinsic value, options unvested $ 0qep_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsUnvestedIntrinsicValue1