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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, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity in earnings of other ventures | $ 3,296 | $ 5,730 | $ 6,160 | $ 5,295 | $ 4,838 | $ 9,806 | $ 7,232 | $ 4,199 | $ 20,481 | $ 26,075 | $ 23,194
Undistributed earnings (losses) from equity method investments | $ 10,100 |  |  |  | $ 20,000 |  |  |  | 10,100 | 20,000 |
Equity method investment, dividends or distributions |  |  |  |  |  |  |  |  | 13,300 | 10,300 | 9,900
Tower Hill Companies |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity in earnings of other ventures |  |  |  |  |  |  |  |  | 13,116 | 18,376 | 10,270
Top Layer Reinsurance Ltd. |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity in earnings of other ventures |  |  |  |  |  |  |  |  | 8,026 | 10,411 | 13,836
Other |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity in earnings of other ventures |  |  |  |  |  |  |  |  | $ (661) | $ (2,712) | $ (912)

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