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Investment Funds Investment Funds (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Schedule of Equity Method Investments [Line Items]
Investment funds	$ 873,884		$ 809,689
Income from Investment Funds	45,248	50,124
Real estate
Schedule of Equity Method Investments [Line Items]
Investment funds	387,296		373,259
Income from Investment Funds	5,777	13,513
Energy
Schedule of Equity Method Investments [Line Items]
Investment funds	154,819		146,325
Income from Investment Funds	25,959	28,966
Arbitrage
Schedule of Equity Method Investments [Line Items]
Investment funds	66,970		63,920
Income from Investment Funds	3,050	3,041
Other
Schedule of Equity Method Investments [Line Items]
Investment funds	264,799		226,185
Income from Investment Funds	$ 10,462	$ 4,604

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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