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Investments (Other investments) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Other investments $ 405,712 $ 336,856
Managed investments    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Other investments 405,712 336,856
Managed investments | Fund of hedge funds    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Other investments 955 1,417
Managed investments | Hedge funds    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Other investments 17,381 20,980
Managed investments | Private equity investments    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Other investments 89,809 63,771
Managed investments | Fixed income investment funds    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Other investments 242,093 188,721
Managed investments | Overseas deposits    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Other investments 50,106 54,484
Managed investments | Mutual funds    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Other investments 5,368 7,483
Subject to redemption restriction | Managed investments | Fixed income investment funds    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Other investments 184,749  
Recurring | Managed investments    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Other investments 405,712 336,856
Recurring | Managed investments | Fund of hedge funds    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Other investments 955 1,417
Recurring | Managed investments | Hedge funds    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Other investments 17,381 20,980
Recurring | Managed investments | Private equity investments    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Other investments 89,809 63,771
Recurring | Managed investments | Fixed income investment funds    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Other investments 242,093 188,721
Recurring | Managed investments | Overseas deposits    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Other investments 50,106 54,484
Recurring | Managed investments | Mutual funds    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Other investments 5,368 7,483
Recurring | Subject to redemption restriction | Managed investments    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Other investments 369,402 308,562
Recurring | Subject to redemption restriction | Managed investments | Fund of hedge funds    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Other investments 955 1,417
Recurring | Subject to redemption restriction | Managed investments | Hedge funds    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Other investments 17,381 20,980
Recurring | Subject to redemption restriction | Managed investments | Private equity investments    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Other investments 89,809 63,771
Recurring | Subject to redemption restriction | Managed investments | Fixed income investment funds    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Other investments 211,151 167,910
Recurring | Subject to redemption restriction | Managed investments | Overseas deposits    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Other investments 50,106 54,484
Recurring | Subject to redemption restriction | Managed investments | Mutual funds    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Other investments 0 0
Recurring | Not subject to redemption restriction | Managed investments    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Other investments 36,310 28,294
Recurring | Not subject to redemption restriction | Managed investments | Fund of hedge funds    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Other investments 0 0
Recurring | Not subject to redemption restriction | Managed investments | Hedge funds    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Other investments 0 0
Recurring | Not subject to redemption restriction | Managed investments | Private equity investments    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Other investments 0 0
Recurring | Not subject to redemption restriction | Managed investments | Fixed income investment funds    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Other investments $ 30,942 $ 20,811
Redemption frequency [1] Daily Daily
Redemption notice period [1] 2 days 2 days
Recurring | Not subject to redemption restriction | Managed investments | Overseas deposits    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Other investments $ 0 $ 0
Recurring | Not subject to redemption restriction | Managed investments | Mutual funds    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Other investments $ 5,368 $ 7,483
Redemption frequency [1] Daily Daily
Minimum | Recurring | Subject to redemption restriction | Managed investments    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Redemption restriction period 5 years  
Maximum | Recurring | Subject to redemption restriction | Managed investments    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Redemption restriction period 10 years  
[1] The redemption frequency and notice periods only apply to investments without redemption restrictions.