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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, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity method investment, dividends or distributions |  |  |  |  |  |  |  |  | $ (26,100) | $ 29,700 | $ 9,400
Equity in earnings (losses) of other ventures | $ 4,143 | $ 7,648 | $ 5,826 | $ 857 | $ 2,200 | $ 1,794 | $ 5,543 | $ (1,507) | 18,474 | 8,030 | 963
Undistributed earnings (losses) from equity method investments | $ (3,800) |  |  |  | $ (6,300) |  |  |  | (3,800) | (6,300) |
Top Layer Re |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity in earnings (losses) of other ventures |  |  |  |  |  |  |  |  | 8,852 | 9,851 | (8,576)
Tower Hill Companies |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity in earnings (losses) of other ventures |  |  |  |  |  |  |  |  | 9,605 | (1,647) | 10,379
Other |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity in earnings (losses) of other ventures |  |  |  |  |  |  |  |  | $ 17 | $ (174) | $ (840)

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