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Investments (Other investments) (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Investment [Line Items]    
Other investments, at fair value $ 394,695 $ 336,856
Managed investments    
Investment [Line Items]    
Other investments, at fair value 394,695 336,856
Managed investments | Fund of hedge funds    
Investment [Line Items]    
Other investments, at fair value 959 1,417
Managed investments | Hedge funds    
Investment [Line Items]    
Other investments, at fair value 18,056 20,980
Managed investments | Private equity investments    
Investment [Line Items]    
Other investments, at fair value 83,670 63,771
Managed investments | Fixed income investment funds    
Investment [Line Items]    
Other investments, at fair value 233,437 188,721
Managed investments | Overseas deposits    
Investment [Line Items]    
Other investments, at fair value 53,246 54,484
Managed investments | Mutual funds    
Investment [Line Items]    
Other investments, at fair value 5,327 7,483
Recurring | Managed investments    
Investment [Line Items]    
Other investments, at fair value 394,695 336,856
Recurring | Managed investments | Fund of hedge funds    
Investment [Line Items]    
Other investments, at fair value 959 1,417
Recurring | Managed investments | Hedge funds    
Investment [Line Items]    
Other investments, at fair value 18,056 20,980
Recurring | Managed investments | Private equity investments    
Investment [Line Items]    
Other investments, at fair value 83,670 63,771
Recurring | Managed investments | Fixed income investment funds    
Investment [Line Items]    
Other investments, at fair value 233,437 188,721
Recurring | Managed investments | Overseas deposits    
Investment [Line Items]    
Other investments, at fair value 53,246 54,484
Recurring | Managed investments | Mutual funds    
Investment [Line Items]    
Other investments, at fair value 5,327 7,483
Recurring | Managed investments | Subject to redemption restriction    
Investment [Line Items]    
Other investments, at fair value 336,626 308,562
Recurring | Managed investments | Subject to redemption restriction | Fund of hedge funds    
Investment [Line Items]    
Other investments, at fair value 959 1,417
Recurring | Managed investments | Subject to redemption restriction | Hedge funds    
Investment [Line Items]    
Other investments, at fair value 18,056 20,980
Recurring | Managed investments | Subject to redemption restriction | Private equity investments    
Investment [Line Items]    
Other investments, at fair value 83,670 63,771
Recurring | Managed investments | Subject to redemption restriction | Fixed income investment funds    
Investment [Line Items]    
Other investments, at fair value 180,695 167,910
Recurring | Managed investments | Subject to redemption restriction | Overseas deposits    
Investment [Line Items]    
Other investments, at fair value 53,246 54,484
Recurring | Managed investments | Subject to redemption restriction | Mutual funds    
Investment [Line Items]    
Other investments, at fair value 0 0
Recurring | Managed investments | Not subject to redemption restriction    
Investment [Line Items]    
Other investments, at fair value 58,069 28,294
Recurring | Managed investments | Not subject to redemption restriction | Fund of hedge funds    
Investment [Line Items]    
Other investments, at fair value 0 0
Recurring | Managed investments | Not subject to redemption restriction | Hedge funds    
Investment [Line Items]    
Other investments, at fair value 0 0
Recurring | Managed investments | Not subject to redemption restriction | Private equity investments    
Investment [Line Items]    
Other investments, at fair value 0 0
Recurring | Managed investments | Not subject to redemption restriction | Fixed income investment funds    
Investment [Line Items]    
Other investments, at fair value $ 52,742 $ 20,811
Redemption frequency [1] Daily Daily
Redemption notice period [1] 2 days 2 days
Recurring | Managed investments | Not subject to redemption restriction | Overseas deposits    
Investment [Line Items]    
Other investments, at fair value $ 0 $ 0
Recurring | Managed investments | Not subject to redemption restriction | Mutual funds    
Investment [Line Items]    
Other investments, at fair value $ 5,327 $ 7,483
Redemption frequency [1] Daily Daily
Redemption notice period [1] 1 day 1 day
[1] The redemption frequency and notice periods only apply to investments without redemption restrictions.