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Fair Value Disclosures (Fair Value, Investments, Entities That Calculate Net Asset Value Per Share) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Aug. 06, 2018
Dec. 31, 2017
Other Investment Vehicles [Member]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]      
Other investments, at fair value $ 602   $ 1,143
U.S. Insurance Fund [Member]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]      
Unfunded commitments [1] 2,000    
U.S. Insurance Fund [Member] | Other Investment Vehicles [Member]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]      
Other investments, at fair value [1] 1,609    
SPAC Fund [Member]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]      
Other investments, at fair value   $ 600  
SPAC Fund [Member] | Other Investment Vehicles [Member]      
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]      
Other investments, at fair value [2] $ 1,006    
[1] The U.S. Insurance JV invests in debt issued by small and medium sized U.S. and Bermuda insurance and reinsurance companies.
[2] The SPAC Fund invests in equity interests of SPACs.