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Commitments and Contingencies Contractual Obligations (Details) (Projects Under Development [Member], USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Projects Under Development [Member]
  
Unaccrued Contractual And Other Commitments $ 19.2pei_UnaccruedContractualAndOtherCommitments
/ us-gaap_OtherCommitmentsAxis
= us-gaap_ConstructionInProgressMember