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Investments (Schedule of Equity in (Losses) Earnings of Other Ventures, Under Equity Method) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity in earnings (losses) of other ventures | $ (1,868) | $ 5,457 | $ 9,041 | $ 4,564 | $ 5,874 | $ 5,877 | $ 6,812 | $ 4,661 | $ 17,194 | $ 23,224 | $ 18,474
Equity method investment, dividends and distributions |  |  |  |  |  |  |  |  | 30,000 | 36,500 | 26,100
Undistributed earnings (losses) from equity method investments | $ 1,600 |  |  |  | $ (800) |  |  |  | 1,600 | (800) | 3,800
Top Layer Re |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity in earnings (losses) of other ventures |  |  |  |  |  |  |  |  | 9,595 | 8,801 | 8,852
Tower Hill Companies |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity in earnings (losses) of other ventures |  |  |  |  |  |  |  |  | 3,104 | 10,337 | 9,605
Other |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity in earnings (losses) of other ventures |  |  |  |  |  |  |  |  | $ 4,495 | $ 4,086 | $ 17

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