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Investment Funds (Schedule of Investment Funds) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule of Equity Method Investments [Line Items]
Investment funds	$ 1,067,495	$ 809,689
Income (Losses)	67,712	77,015	9,452
Real estate
Schedule of Equity Method Investments [Line Items]
Investment funds	378,435	373,259
Income (Losses)	9,315	30,196	14,527
Energy
Schedule of Equity Method Investments [Line Items]
Investment funds	155,026	146,325
Income (Losses)	29,739	33,146	(6,101)
Hedged equity
Schedule of Equity Method Investments [Line Items]
Investment funds	271,575	63,920
Income (Losses)	7,655	5,912	(1,366)
Other funds
Schedule of Equity Method Investments [Line Items]
Investment funds	262,459	226,185
Income (Losses)	$ 21,003	$ 7,761	$ 2,392

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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