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Available-for-Sale Securities (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]  
Current Fiscal Year End Date --12-31
available-for-sale securities, cost basis $ 14.3reg_Availableforsalesecuritiescostbasis
Proceeds from Sale of Available-for-sale Securities 22.1us-gaap_AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds
Partnership Interest [Member]  
Schedule of Available-for-sale Securities [Line Items]  
Available-for-sale securities, pursuit costs $ 1.8reg_Availableforsalesecuritiespursuitcosts
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember