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Investments (Schedule of Investments in Other Ventures, under Equity Method) (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jul. 01, 2008 | Dec. 31, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 06, 1999
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Investment |  |  |  |  | $ 165,987 | $ 143,775 |  |
Carrying Value |  |  |  |  | 115,172 | 101,974 |  |
Equity method investee, additional contribution |  |  |  |  | 21,473 | 0 | $ 0 |
Tower Hill Companies |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Investment |  |  |  |  | $ 64,750 | $ 64,750 |  |
Ownership % |  |  |  |  | 24.90% | 26.30% |  |
Carrying Value |  |  |  |  | $ 38,241 | $ 42,167 |  |
THIG |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Investment | $ 50,000 |  |  |  |  |  |  |
Ownership % | 25.00% |  |  |  |  |  |  |
Intangible assets, net | $ 40,000 |  |  |  |  |  |  |
Goodwill | $ 7,800 |  |  |  |  |  |  |
Top Layer Re |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Investment |  |  |  |  | $ 65,375 | $ 65,375 |  | $ 13,100
Ownership % |  |  |  |  | 50.00% | 50.00% |  | 50.00%
Carrying Value |  |  |  |  | $ 46,562 | $ 50,211 |  |
Equity method investee, additional contribution |  | $ 18,000 | $ 20,500 | $ 13,800 |  |  |  |
Other |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Investment |  |  |  |  | $ 35,862 | $ 13,650 |  |
Ownership % |  |  |  |  | 30.60% | 40.40% |  |
Carrying Value |  |  |  |  | $ 30,369 | $ 9,596 |  |

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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109237563&loc=d3e33749-111570 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8813-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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