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2. VARIABLE INTEREST ENTITY (Details) (VIEBalanceSheetMember, USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
--- | --- | ---
VIEBalanceSheetMember |  |
Values and classification of assets that are collateral for the obligations of New PE Holdco |  |
Cash and cash equivalents | $ 92 | $ 2,070
Other current assets | 13,368 | 14,320
Property and equipment | 148,390 | 155,523
Other assets | 1,368 | 1,693
Total assets | 163,218 | 173,606
Current liabilities | 6,063 | 3,064
Long-term debt, including current portion | 91,186 | 73,256
Other liabilities | 195 | 158
Total liabilities | $ 97,444 | $ 76,478

X
- Definition Cash and cash equivalents used as collateral for New PE Holdco + References No definition available. + Details
Name: | peix_CashAndCashEquivalentsVIE
Namespace Prefix: | peix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Current liabilites used as collateral for New PE Holdco + References No definition available. + Details
Name: | peix_CurrentLiabilitiesVIE
Namespace Prefix: | peix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Long-term debt including current portion + References No definition available. + Details
Name: | peix_LongAndShortTermDebt
Namespace Prefix: | peix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Other assets used as collateral for New PE Holdco + References No definition available. + Details
Name: | peix_OtherAssetsVIE
Namespace Prefix: | peix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Other current assets used as collateral for New PE Holdco + References No definition available. + Details
Name: | peix_OtherCurrentAssetsVIE
Namespace Prefix: | peix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Other liabilites used as collateral for New PE Holdco + References No definition available. + Details
Name: | peix_OtherLiabilitiesVIE
Namespace Prefix: | peix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Property and equipment used as collateral for New PE Holdco + References No definition available. + Details
Name: | peix_PropertyAndEquipmentVIE
Namespace Prefix: | peix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Total assets used as collateral for New PE Holdco + References No definition available. + Details
Name: | peix_TotalAssetsVIE
Namespace Prefix: | peix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Total liabilites used as collateral for New PE Holdco + References No definition available. + Details
Name: | peix_TotalLiabilitiesVIE
Namespace Prefix: | peix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_VariableInterestEntityClassificationOfCarryingAmountAssetsAndLiabilitiesNetAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration