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Investment Funds Investment Funds (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]
Investment funds	$ 1,020,132		$ 1,067,495
Income from Investment Funds	135,232	45,248
Real estate
Schedule of Equity Method Investments [Line Items]
Investment funds	282,431		378,435
Income from Investment Funds	24,341	5,777
Energy
Schedule of Equity Method Investments [Line Items]
Investment funds	159,857		155,026
Income from Investment Funds	18,136	25,959
Arbitrage
Schedule of Equity Method Investments [Line Items]
Investment funds	286,845		271,575
Income from Investment Funds	15,270	3,050
Other
Schedule of Equity Method Investments [Line Items]
Investment funds	290,999		262,459
Income from Investment Funds	$ 77,485	$ 10,462

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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