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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