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ACQUISITIONS (Schedule of Consideration Paid) (Details) (USD $)
In Thousands, unless otherwise specified
 0 Months Ended
Oct. 16, 2014
Sep. 19, 2014
Central Desktop    
Business Acquisition [Line Items]    
Negotiated sales price $ 25,000pgi_BusinessCombinationConsiderationTransferredBeforeWorkingCapitalAdjustment
/ us-gaap_BusinessAcquisitionAxis
= pgi_CentralDesktopMember		  
Preliminary working capital and other adjustments 76pgi_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentWorkingCapital
/ us-gaap_BusinessAcquisitionAxis
= pgi_CentralDesktopMember		  
Preliminary purchase price 25,076us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= pgi_CentralDesktopMember		  
TalkPoint    
Business Acquisition [Line Items]    
Negotiated sales price   56,500pgi_BusinessCombinationConsiderationTransferredBeforeWorkingCapitalAdjustment
/ us-gaap_BusinessAcquisitionAxis
= pgi_TalkPointHoldingsLLCMember
Preliminary working capital and other adjustments   (917)pgi_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentWorkingCapital
/ us-gaap_BusinessAcquisitionAxis
= pgi_TalkPointHoldingsLLCMember
Preliminary purchase price   $ 55,583us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= pgi_TalkPointHoldingsLLCMember