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EMPLOYEE BENEFIT PLANS (Details 8) (Level 3, Group deposit administration annuity contract, Contract Value, USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Employee benefit plans  
Fair Value 64,296us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Minimum
  
Employee benefit plans  
Contract rate (as a percent) 5.28%plico_FairValueInputsContractRatePercentage
/ us-gaap_FairValueByAssetClassAxis
= plico_GroupDepositAdministrationAnnuityContractMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= plico_ContractValueValuationTechniqueMember
Maximum
  
Employee benefit plans  
Contract rate (as a percent) 5.47%plico_FairValueInputsContractRatePercentage
/ us-gaap_FairValueByAssetClassAxis
= plico_GroupDepositAdministrationAnnuityContractMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= plico_ContractValueValuationTechniqueMember