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Debt and Other Long Term Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Long Term Liabilities [Abstract]    
Bank indebtedness $ 518,000us-gaap_NotesPayableToBank $ 460,000us-gaap_NotesPayableToBank
Senior notes 2,760,000us-gaap_OtherNotesPayable 2,010,000us-gaap_OtherNotesPayable
Other long-term obligations 152,472us-gaap_OtherLiabilitiesNoncurrent 91,932us-gaap_OtherLiabilitiesNoncurrent
Total Debt And Long Term Liabilities 3,530,472upl_TotalDebtAndLongTermLiabilities 2,561,932upl_TotalDebtAndLongTermLiabilities
Short-term Debt [Abstract]    
Senior Notes due March 2015 $ 100,000us-gaap_LongTermDebtCurrent $ 0us-gaap_LongTermDebtCurrent