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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Schedule of Equity Method Investments [Line Items]        
Net investment income earned $ 58,505 $ 45,553 $ 109,123 $ 88,784
Alternative Investments [Member]        
Schedule of Equity Method Investments [Line Items]        
Net investment income earned 7,300 1,900 7,900 3,500
Investments accounted for under the equity method [Member]        
Schedule of Equity Method Investments [Line Items]        
Net investment income (loss) 174,100 (6,400) 24,100 (41,800)
Realized gains 106,000 629,500 249,300 1,223,500
Net change in unrealized appreciation (depreciation) 2,223,700 (1,200,200) 2,778,000 (738,600)
Net income (loss) $ 2,503,800 $ (577,100) $ 3,051,400 $ 443,100