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Share Based Compensation (Details Textuals) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share Based Compensation Details [Abstract]      
Companys Closing Stock Price Last Day Of Year $ 13.16upl_CompanysClosingStockPriceLastDayOfYear    
Number Of In The Money Options Exercisable 0upl_NumberOfInMoneyOptionsExercisable    
Fair Value Of Options Vesting In The Period 0upl_FairValueOfOptionsVestingInPeriod 0upl_FairValueOfOptionsVestingInPeriod 0upl_FairValueOfOptionsVestingInPeriod
Total intrinsic value of stock options excercised 400,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue 300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
Long Term Incentive Program Period 6,300,000upl_LongTermIncentiveProgramPeriod 6,900,000upl_LongTermIncentiveProgramPeriod 7,900,000upl_LongTermIncentiveProgramPeriod
Long Term Incentive Program Total 2012 Program 10,200,000upl_LongTermIncentiveProgramTotal2012Program    
Long Term Incentive Program Total 2013 Program 12,600,000upl_LongTermIncentiveProgramTotal2013Program    
Long Term Incentive Program Total 2014 Program 13,000,000upl_LongTermIncentiveProgramTotal2014Program    
Long Term Incentive Program Total 2011 Program $ 8,400,000upl_LongTermIncentiveProgramTotalProgramFifth    
Long Term Incentive Program Total 2011 Program Shares 106,437upl_LongTermIncentiveProgramTotal2010ProgramShares