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FAIR VALUE MEASUREMENTS (Recurring) (Details) (Recurring, USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current Assets:
Available-for-sale securities	$ 334us-gaap_AvailableForSaleSecurities	$ 327us-gaap_AvailableForSaleSecurities
Total	334us-gaap_AssetsFairValueDisclosure	327us-gaap_AssetsFairValueDisclosure
Current Liabilities:
Earn-out liability	15,010	4,727
Long-term Liabilities:
Earn-out liability	16,164pgi_EarnoutLiabilityFairValueDisclosure	6,545pgi_EarnoutLiabilityFairValueDisclosure
Total	31,174us-gaap_LiabilitiesFairValueDisclosure	11,272us-gaap_LiabilitiesFairValueDisclosure
Level 1
Current Assets:
Available-for-sale securities	334	327
Total	334	327
Current Liabilities:
Earn-out liability	0	0
Long-term Liabilities:
Earn-out liability	0	0
Total	0	0
Level 2
Current Assets:
Available-for-sale securities	0	0
Total	0	0
Current Liabilities:
Earn-out liability	0	0
Long-term Liabilities:
Earn-out liability	0	0
Total	0	0
Level 3
Current Assets:
Available-for-sale securities	0	0
Total	0	0
Current Liabilities:
Earn-out liability	15,010	4,727
Long-term Liabilities:
Earn-out liability	16,164	6,545
Total	$ 31,174	$ 11,272