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FAIR VALUE MEASUREMENTS (Narrative) (Details) (USD $)
12 Months Ended 1 Months Ended
Dec. 31, 2014
Feb. 28, 2014
Dec. 31, 2013
Feb. 18, 2014
Europe        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Land, building and improvements $ 800,000us-gaap_PropertyPlantAndEquipmentFairValueDisclosure
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
  $ 1,800,000us-gaap_PropertyPlantAndEquipmentFairValueDisclosure
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
 
Proceeds from sale of facility 800,000us-gaap_ProceedsFromSaleOfBuildings
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
     
Investment In Conferencing Company        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Percent of investment sold   50.00%pgi_AvailableforsaleSecuritiesSoldPercentage
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= pgi_InvestmentInConferencingCompanyMember
  50.00%pgi_AvailableforsaleSecuritiesSoldPercentage
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= pgi_InvestmentInConferencingCompanyMember
Investment accounted for under cost method investment   1,000,000us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= pgi_InvestmentInConferencingCompanyMember
   
Gain on sale of investment   $ 500,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= pgi_InvestmentInConferencingCompanyMember