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Commitments, Contingencies and Guarantees (Details Textual) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Put Obtains Upon Termination and Other $ 102,089    
Investment Commitments 4,106    
Letters of Credit Outstanding, Amount 4,771 5,830  
Estimated Payments for Purchase of Ownership Interest on Exercise of Put Options 15,866    
Estimated Issuance of Share Capital for Purchase of Ownership Interest on Exercise of Put Options 1,414    
Estimated Aggregate Amount For Purchase Of Ownership Interest On Exercise Of Put Options 117,953    
Operating Leases, Rent Expense 36,457 26,847 18,429
Operating Leases, Income Statement, Sublease Revenue 820 555 277
Accrued Sublease Income Receivable $ 1,382