XML 29 R35.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Recently Issued Accounting Pronouncements (Details) (Defined pension, Reclassification from accumulated other comprehensive income, USD $) | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Defined pension | Reclassification from accumulated other comprehensive income |  |
Recently Issued Accounting Pronouncements |  |
Amounts reclassified | $ 228,000 | $ 185,000

X
- 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

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