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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Impaired long-lived assets    
Fair value measurements    
Weighted average disposal period used in estimation of the fair value of the impaired long-lived assets 4 years  
Impaired long-lived assets | Weighted average    
Fair value measurements    
Discount rate used in estimation of the fair value of the impaired long-lived assets (as a percent) 9.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= exlp_ImpairedLongLivedAssetsMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
 
Recurring basis | Level 2    
Fair value measurements    
Interest rate swaps asset 712us-gaap_DerivativeAssetNotSubjectToMasterNettingArrangement
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
$ 322us-gaap_DerivativeAssetNotSubjectToMasterNettingArrangement
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Interest rate swaps liability (5,108)us-gaap_DerivativeLiabilityNotSubjectToMasterNettingArrangement
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
(3,374)us-gaap_DerivativeLiabilityNotSubjectToMasterNettingArrangement
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Nonrecurring basis | Level 3    
Fair value measurements    
Impaired long-lived assets 982exlp_ImpairedLongLivedAssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
$ 1,459exlp_ImpairedLongLivedAssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember