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Investments (Details) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Investments.      
Available for sale investments $ 9,861,000us-gaap_AvailableForSaleSecuritiesCurrent $ 9,698,000us-gaap_AvailableForSaleSecuritiesCurrent $ 0us-gaap_AvailableForSaleSecuritiesCurrent