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Investments (Schedule of Investments in Other Ventures, under Equity Method) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |
Carrying Value | $ 106,549 | $ 115,172
Tower Hill Companies |  |
Schedule of Equity Method Investments [Line Items] |  |
Ownership % | 24.90% | 24.90%
Carrying Value | $ 36,779 | $ 38,241
Top Layer Re |  |
Schedule of Equity Method Investments [Line Items] |  |
Ownership % | 50.00% | 50.00%
Carrying Value | $ 35,363 | $ 46,562
Other |  |
Schedule of Equity Method Investments [Line Items] |  |
Ownership % | 26.60% | 30.60%
Carrying Value | $ 34,407 | $ 30,369

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