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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jan. 06, 1999
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Investment |  |  |  |  | $ 143,775 | $ 154,048 |  |
Investments in other ventures, under equity method |  |  |  |  | 101,974 | 124,227 |  |
Equity method investee, additional contribution |  |  |  |  | 0 | 0 | $ 10,150 |
Tower Hill Companies |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Investment |  |  |  |  | 64,750 | 64,750 |  |
Investments in other ventures, under equity method |  |  |  |  | 42,167 | 52,864 |  |
THIG |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Investment | $ 50,000 |  |  |  | $ 50,000 | $ 50,000 |  |
Ownership % | 25.00% |  |  |  | 25.00% | 25.00% |  |
Investments in other ventures, under equity method |  |  |  |  | $ 20,856 | $ 19,286 |  |
Intangible assets, net | $ 40,000 |  |  |  |  |  |  |
Goodwill | $ 7,800 |  |  |  |  |  |  |
Tower Hill |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Investment |  |  |  |  | $ 10,000 | $ 10,000 |  |
Ownership % |  |  |  |  | 33.30% | 32.30% |  |
Investments in other ventures, under equity method |  |  |  |  | $ 14,917 | $ 21,590 |  |
Tower Hill Re |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Investment |  |  |  |  | $ 4,250 | $ 4,250 |  |
Ownership % |  |  |  |  | 25.00% | 25.00% |  |
Investments in other ventures, under equity method |  |  |  |  | $ 0 | $ 2,903 |  |
Tower Hill Signature |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Investment |  |  |  |  | $ 500 | $ 500 |  |
Ownership % |  |  |  |  | 25.00% | 25.00% |  |
Investments in other ventures, under equity method |  |  |  |  | $ 6,394 | $ 9,085 |  |
Top Layer Re |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Investment |  |  |  |  | $ 65,375 | $ 65,375 |  | $ 13,100
Ownership % |  |  |  |  | 50.00% | 50.00% |  | 50.00%
Investments in other ventures, under equity method |  |  |  |  | $ 50,211 | $ 60,360 |  |
Equity method investee, additional contribution |  | $ 18,000 | $ 20,500 | $ 13,800 |  |  |  |
Other |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Investment |  |  |  |  | $ 13,650 | $ 23,923 |  |
Ownership % |  |  |  |  | 40.40% | 41.80% |  |
Investments in other ventures, under equity method |  |  |  |  | $ 9,596 | $ 11,003 |  |

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66022249&loc=d3e33749-111570 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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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- Definition The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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