Investments (Loss) Gain on Securities, Net of Investment Income (Details) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | |||||||||
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Mar. 31, 2015
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Mar. 31, 2014
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Gain (Loss) on Investments [Line Items] | ||||||||||
(Loss) gain on securities, net | $ (254) | [1] | $ 1,913 | [1] | ||||||
Consolidated Investment Companies [Member] | ||||||||||
Gain (Loss) on Investments [Line Items] | ||||||||||
(Loss) gain on securities, net | (300) | 300 | ||||||||
Trading Securities [Member] | ||||||||||
Gain (Loss) on Investments [Line Items] | ||||||||||
Unrealized gain on trading securities | 456 | 349 | ||||||||
Realized gains | 189 | [2] | 953 | [2] | ||||||
Realized losses | (613) | [2] | (914) | [2] | ||||||
Derivatives [Member] | ||||||||||
Gain (Loss) on Investments [Line Items] | ||||||||||
Unrealized loss on derivatives | (159) | [3] | (62) | [3] | ||||||
Realized gains | 235 | [2],[3] | 66 | [2],[3] | ||||||
Realized losses | (362) | [2],[3] | (7) | [2],[3] | ||||||
Available-for-sale Securities [Member] | ||||||||||
Gain (Loss) on Investments [Line Items] | ||||||||||
Realized gains | $ 0 | [2] | $ 1,528 | [2] | ||||||
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