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Commitments, Contingencies and Guarantees (Details Textual) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Commitments, Contingencies and Guarantees [Line Items]      
Estimated Payment for Put Options Upon Termination $ 130,727    
Investment Commitments 2,546    
Letters of Credit Outstanding, Amount 4,884    
Estimated Payments For Put Option Excluding Termination 17,807    
Estimated Issuance of Share Capital for Purchase of Ownership Interest on Exercise of Put Options 1,319    
Estimated Aggregate Amount For Put Options 148,534    
Operating Leases, Rent Expense 40,111 35,909 26,521
Operating Leases, Income Statement, Sublease Revenue 897 820 555
Future Sublease Income Receivable $ 6,201