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Investment Funds (Schedule of Investment Funds) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule of Equity Method Investments [Line Items]
Investment funds	$ 1,211,401us-gaap_EquityMethodInvestments	$ 1,067,495us-gaap_EquityMethodInvestments
Income	131,649	67,712	77,015
Real estate
Schedule of Equity Method Investments [Line Items]
Investment funds	466,703	378,435
Income	26,233	9,315	30,196
Energy
Schedule of Equity Method Investments [Line Items]
Investment funds	152,056	155,026
Income	12,797	29,739	33,146
Hedged equity
Schedule of Equity Method Investments [Line Items]
Investment funds	282,335	271,575
Income	10,760	7,655	5,912
Other funds
Schedule of Equity Method Investments [Line Items]
Investment funds	310,307	262,459
Income	$ 81,859	$ 21,003	$ 7,761

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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