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Share-Based Compensation - Activity (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Number of Options (in shares)  
Outstanding at beginning of year 1,892,493us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Granted 69,434us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Expired/cancelled/forfeited (156,724)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod
Exercised (287,499)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Outstanding at end of year 1,517,704us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Wgtd. Avg. Exercise Price (in dollars per share)  
Outstanding at beginning of year $ 5.67us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Granted $ 4.13us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
Expired/cancelled/forfeited $ 5.60us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice
Exercised $ 3.34us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
Outstanding at end of year $ 6.05us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Additional Disclosures  
Options exercisable at end of year 1,172,400us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
Options expected to vest 328,039pq_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpectedToVestOutstandingNumber
Options exercisable at end of year (usd per share) $ 6.58us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
Options expected to vest (usd per share) $ 4.27pq_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpectedToVestOutstandingWeightedAverageExercisePrice
Outstanding, remaining contractual term (in years) 6 years
Exercisable, remaining contractual term (in years) 5 years 3 months 18 days
Vested and expected to vest, remaining contractual term (in years) 8 years 7 months 6 days
Outstanding, intrinsic value $ 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
Exercisable, intrinsic value 0us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
Vested and expected to vest, intrinsic value $ 0pq_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpectedToVestOutstandingAggregateIntrinsicValue