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Investment Funds Investment Funds (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]
Investment funds	$ 984,836		$ 1,067,495
Income (Loss) from Investment Funds	76,155	33,510
Real estate
Schedule of Equity Method Investments [Line Items]
Investment funds	280,255		378,435
Income (Loss) from Investment Funds	16,482	1,260
Energy
Schedule of Equity Method Investments [Line Items]
Investment funds	159,645		155,026
Income (Loss) from Investment Funds	12,596	25,199
Arbitrage
Schedule of Equity Method Investments [Line Items]
Investment funds	279,806		271,575
Income (Loss) from Investment Funds	8,231	1,731
Other
Schedule of Equity Method Investments [Line Items]
Investment funds	265,130		262,459
Income (Loss) from Investment Funds	$ 38,846	$ 5,320

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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