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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, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity in earnings (losses) of other ventures | $ 4,960 | $ (11,630) | $ 6,022 | $ 1,611 | $ 3,296 | $ 5,730 | $ 6,160 | $ 5,295 | $ 963 | $ 20,481 | $ 26,075
Equity method investment, dividends or distributions |  |  |  |  |  |  |  |  | 9,400 | 13,300 | 10,300
Undistributed earnings (losses) from equity method investments | $ (5,500) |  |  |  | $ 10,100 |  |  |  | (5,500) | 10,100 |
Tower Hill Companies |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity in earnings (losses) of other ventures |  |  |  |  |  |  |  |  | 10,379 | 13,116 | 18,376
Top Layer Reinsurance Ltd. |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity in earnings (losses) of other ventures |  |  |  |  |  |  |  |  | (8,576) | 8,026 | 10,411
Other |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity in earnings (losses) of other ventures |  |  |  |  |  |  |  |  | $ (840) | $ (661) | $ (2,712)

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