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Recently Issued Accounting Pronouncements (Details) (Defined benefit pension, Reclassification from accumulated other comprehensive income, USD $) | 6 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012
Defined benefit pension | Reclassification from accumulated other comprehensive income |  |
Recently Issued Accounting Pronouncements |  |
Amounts reclassified | $ 390,000 | $ 370,000

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- Definition Amount after tax of reclassification adjustment from accumulated other comprehensive (income) loss related to net period benefit cost (credit) for pension and other postretirement defined benefit plans. + References No definition available. + Details
Name: | mlp_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax
Namespace Prefix: | mlp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | mlp_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems
Namespace Prefix: | mlp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration