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Investments (Aggregated Income Statement Summarized Financial Information for Partnerhips in our Alternative Investment Portfolio) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]          
Net investment income earned $ 34,444 $ 58,505 $ 90,411 $ 109,123  
Carrying Value 230,520   230,520   $ 216,807
Alternative Investments [Member]          
Schedule of Equity Method Investments [Line Items]          
Net investment income earned (16,000) 7,300 (9,700) 7,900  
Investments accounted for under the equity method [Member]          
Schedule of Equity Method Investments [Line Items]          
Net investment (loss) income (3,100) 174,100 9,600 24,100  
Realized (losses) gains 179,000 106,000 343,800 249,300  
Net change in unrealized appreciation (depreciation) (2,862,900) 2,223,700 (1,658,900) 2,778,000  
Net income $ (2,687,000) $ 2,503,800 $ (1,305,500) $ 3,051,400