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Commitments, Contingencies and Guarantees (Details Textual) (USD $) In Thousands, unless otherwise specified | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2012 | Dec. 31, 2011 | Jun. 30, 2011 | Dec. 31, 2010
Estimated Payments for Purchase of Ownership Interest on Exercise of Put Options | $ 23,917 |  |  |
Estimated Issuance of Share Capital for Purchase of Ownership Interest on Exercise of Put Options | 2,784 |  |  |
Put Obtains Upon Termination and Other | 78,877 |  |  |
Redeemable Noncontrolling Interest, Equity, Fair Value | 102,794 | 107,432 | 89,233 | 77,560
Investment Commitments | 2,767 |  |  |
Letters of Credit Outstanding, Amount | $ 5,204 |  |  |

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