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Commitments, Contingencies and Guarantees (Details Textual) (USD $) In Thousands, unless otherwise specified | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Dec. 31, 2010
Estimated Payments for Purchase of Ownership Interest on Exercise of Put Options | $ 17,978 |  |  |
Estimated Issuance of Share Capital for Purchase of Ownership Interest on Exercise of Put Options | 2,710 |  |  |
Put Obtains Upon Termination and Other | 82,477 |  |  |
Redeemable Noncontrolling Interest, Equity, Fair Value | 100,455 | 107,432 | 94,681 | 77,560
Investment Commitments | 3,751 |  |  |
Letters of Credit Outstanding, Amount | $ 4,969 |  |  |

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