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Other assets and other liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Other assets      
Prepaid commissions $ 5,042 $ 10,193  
Accounts receivable 1,514 1,749  
Equity investment in a private fund (at cost) 530 961  
Other 1,303 1,677  
Other Assets 8,389 14,580 18,412
Other liabilities      
Accruals and provisions 22,516 20,345  
Accounts payable 2,471 6,045  
Other 2,960 1,958  
Other Liabilities $ 27,947 $ 28,348