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Other assets and other liabilities (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | --- | ---
Other assets |  |  |
Prepaid commissions | $ 10,193 | $ 10,357 |
Accounts receivable | 1,749 | 1,260 |
Equity investment in a private fund (at cost) | 961 | 1,415 |
Other | 1,677 | 5,380 |
Other Assets | 14,580 | 18,412 | 10,953
Other liabilities |  |  |
Accruals and provisions | 20,345 | 14,773 |
Accounts payable | 6,045 | 5,417 |
Other | 1,958 | 2,378 |
Other Liabilities | $ 28,348 | $ 22,568 |

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