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Investments - Narrative (Details) - Venture Capital Funds - USD ($)
$ in Thousands
Feb. 23, 2018
Jun. 08, 2015
Nov. 21, 2013
Dec. 31, 2017
Investment [Line Items]        
Capital commitment     $ 5,000 $ 2,700
Percentage of limited partnership interest     10.00%  
Cash distribution   $ 826    
Gross entitlement   $ 1,271    
Subsequent Event        
Investment [Line Items]        
Capital commitment $ 2,200      
Payment for JVP fund $ 500