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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, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity in earnings of other ventures | $ 5,874 | $ 5,877 | $ 6,812 | $ 4,661 | $ 4,143 | $ 7,648 | $ 5,826 | $ 857 | $ 23,224 | $ 18,474 | $ 8,030
Equity method investment, dividends and distributions |  |  |  |  |  |  |  |  | (36,500) | (26,100) | 29,700
Undistributed earnings (losses) from equity method investments | $ (800) |  |  |  | $ 3,800 |  |  |  | (800) | 3,800 | (6,300)
Tower Hill Companies |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity in earnings of other ventures |  |  |  |  |  |  |  |  | 10,337 | 9,605 | (1,647)
Top Layer Re |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity in earnings of other ventures |  |  |  |  |  |  |  |  | 8,801 | 8,852 | 9,851
Other |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity in earnings of other ventures |  |  |  |  |  |  |  |  | $ 4,086 | $ 17 | $ (174)

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