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New Business (Narrative) (Details) - USD ($)
$ in Thousands
May 16, 2018
Sep. 30, 2018
Aug. 06, 2018
Dec. 31, 2017
Investments Measured At NAV [Member]        
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]        
Other investments, at fair value [1]   $ 3,217   $ 1,143
U.S. Insurance Fund [Member]        
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]        
Required investment percentage of total equity 4.50%      
Origination fee, percentage 1.00%      
U.S. Insurance Fund [Member] | Maximum [Member]        
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]        
Other investments, at fair value $ 3,000      
U.S. Insurance Fund [Member] | Investor [Member]        
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]        
Other investments, at fair value $ 63,000      
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] | Investments Measured At NAV [Member]        
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]        
Other investments, at fair value   $ 15,331    
[1] As a practical expedient, the Company uses NAV or its equivalent to measure the fair value of its investments in EuroDekania, the U.S. Insurance JV, and the SPAC Fund. EuroDekania invests in hybrid capital securities of European companies. The U.S. Insurance JV invests in debt issued by small and medium sized U.S. and Bermuda insurance and reinsurance companies. The SPAC Fund invests in equity securities of SPACs. According to ASC 820, these investments are not categorized within the fair value hierarchy.