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Investments Available-for-sale Securities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis $ 6,629us-gaap_AvailableForSaleSecuritiesAmortizedCost $ 3,370us-gaap_AvailableForSaleSecuritiesAmortizedCost
Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax 808us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax (196)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax
Available-for-sale securities 7,437us-gaap_AvailableForSaleSecurities 3,174us-gaap_AvailableForSaleSecurities
Convertible debt securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 2,030us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ invest_InvestmentAxis
= us-gaap_ConvertibleDebtSecuritiesMember
3,370us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ invest_InvestmentAxis
= us-gaap_ConvertibleDebtSecuritiesMember
Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax 497us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax
/ invest_InvestmentAxis
= us-gaap_ConvertibleDebtSecuritiesMember
(196)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax
/ invest_InvestmentAxis
= us-gaap_ConvertibleDebtSecuritiesMember
Available-for-sale securities 2,527us-gaap_AvailableForSaleSecurities
/ invest_InvestmentAxis
= us-gaap_ConvertibleDebtSecuritiesMember
3,174us-gaap_AvailableForSaleSecurities
/ invest_InvestmentAxis
= us-gaap_ConvertibleDebtSecuritiesMember
Redeemable preferred shares [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 4,599us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ invest_InvestmentAxis
= us-gaap_RedeemablePreferredStockMember
0us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ invest_InvestmentAxis
= us-gaap_RedeemablePreferredStockMember
Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax 311us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax
/ invest_InvestmentAxis
= us-gaap_RedeemablePreferredStockMember
0us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainLossBeforeTax
/ invest_InvestmentAxis
= us-gaap_RedeemablePreferredStockMember
Available-for-sale securities $ 4,910us-gaap_AvailableForSaleSecurities
/ invest_InvestmentAxis
= us-gaap_RedeemablePreferredStockMember
$ 0us-gaap_AvailableForSaleSecurities
/ invest_InvestmentAxis
= us-gaap_RedeemablePreferredStockMember