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INCOME TAXES (Deferred Tax Assets Valuation Allowances) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]      
Balance at $ 29,087us-gaap_DeferredTaxAssetsValuationAllowance $ 26,561us-gaap_DeferredTaxAssetsValuationAllowance $ 24,145us-gaap_DeferredTaxAssetsValuationAllowance
Additions 2,692pgi_DeferredTaxAssetsValuationAdditions 6,322pgi_DeferredTaxAssetsValuationAdditions 2,416pgi_DeferredTaxAssetsValuationAdditions
Deductions (4,276)pgi_DeferredTaxAssetsValuationDeductions (3,796)pgi_DeferredTaxAssetsValuationDeductions 0pgi_DeferredTaxAssetsValuationDeductions
Balance at $ 27,503us-gaap_DeferredTaxAssetsValuationAllowance $ 29,087us-gaap_DeferredTaxAssetsValuationAllowance $ 26,561us-gaap_DeferredTaxAssetsValuationAllowance