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Fair Value Disclosures (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount $ 0 $ 0 $ 0 $ 0
Fair Value, Liabilities, Level 1 to Level 2 Transfers, Amount 0 0 0 0
Fair value of assets transfers into level 3
Fair value of assets transfers out of level 3 11,295,000 13,361,000
Fair value, option, changes in fair value, gains (losses) 1,976,000 $ (107,000) 3,136,000 $ (385,000)
Alternative Investments [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair Value, Equity, Level 3 to Level 2 Transfers, Amount 13,361,000   13,361,000  
CLOs [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair Value, Equity, Level 3 to Level 2 Transfers, Amount 11,295,000   11,295,000  
Equity securities [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair Value, Equity, Level 3 to Level 2 Transfers, Amount $ 2,066,000   $ 2,066,000