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Investments (Loss) Gain on Securities, Net of Investment Income (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Gain (Loss) on Investments [Line Items]    
(Loss) gain on securities, net $ (254)us-gaap_MarketableSecuritiesGainLoss [1] $ 1,913us-gaap_MarketableSecuritiesGainLoss [1]
Consolidated Investment Companies [Member]    
Gain (Loss) on Investments [Line Items]    
(Loss) gain on securities, net (300)us-gaap_MarketableSecuritiesGainLoss
/ invest_InvestmentHoldingAxis
= us-gaap_OtherInvestmentCompaniesMember
300us-gaap_MarketableSecuritiesGainLoss
/ invest_InvestmentHoldingAxis
= us-gaap_OtherInvestmentCompaniesMember
Trading Securities [Member]    
Gain (Loss) on Investments [Line Items]    
Unrealized gain on trading securities 456us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_TradingAccountAssetsMember
349us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_TradingAccountAssetsMember
Realized gains 189us-gaap_GainOnSaleOfInvestments
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_TradingAccountAssetsMember
[2] 953us-gaap_GainOnSaleOfInvestments
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_TradingAccountAssetsMember
[2]
Realized losses (613)us-gaap_LossOnSaleOfInvestments
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_TradingAccountAssetsMember
[2] (914)us-gaap_LossOnSaleOfInvestments
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_TradingAccountAssetsMember
[2]
Derivatives [Member]    
Gain (Loss) on Investments [Line Items]    
Unrealized loss on derivatives (159)us-gaap_UnrealizedGainLossOnDerivatives
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_DerivativeMember
[3] (62)us-gaap_UnrealizedGainLossOnDerivatives
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_DerivativeMember
[3]
Realized gains 235us-gaap_GainOnSaleOfInvestments
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_DerivativeMember
[2],[3] 66us-gaap_GainOnSaleOfInvestments
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_DerivativeMember
[2],[3]
Realized losses (362)us-gaap_LossOnSaleOfInvestments
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_DerivativeMember
[2],[3] (7)us-gaap_LossOnSaleOfInvestments
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_DerivativeMember
[2],[3]
Available-for-sale Securities [Member]    
Gain (Loss) on Investments [Line Items]    
Realized gains $ 0us-gaap_GainOnSaleOfInvestments
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_AvailableforsaleSecuritiesMember
[2] $ 1,528us-gaap_GainOnSaleOfInvestments
/ us-gaap_GainLossOnInvestmentsByCategoryAxis
= us-gaap_AvailableforsaleSecuritiesMember
[2]
[1] Amounts related to consolidated investment companies totaled ($0.3) million and $0.3 million for the three months ended March 31, 2015 and March 31, 2014, respectively.
[2] Realized gains and losses are computed on a specific-identification basis.
[3] Amounts related to the settlement of economic derivatives held by certain consolidated investment companies.