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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