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Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Mar. 02, 2015
Minimum |  |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |  |
Finite-lived intangible assets, useful life | 1 year |  |  |
Maximum |  |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |  |
Finite-lived intangible assets, useful life | 16 years |  |  |
Weighted Average |  |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |  |
Finite-lived intangible assets, useful life | 7 years 10 months 24 days |  |  |
Investments in other ventures, under equity method |  |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |  |
Goodwill | $ 7,818 | $ 7,818 | $ 7,818 |
Platinum Underwriters Holdings, Ltd. |  |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |  |
Goodwill |  |  |  | $ 191,729
Finite lived intangible assets acquired |  |  |  | 75,200
Indefinite lived intangible assets acquired |  |  |  | $ 8,400

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- Definition Schedule of Goodwill and Intangible Assets [Line Items] + References No definition available. + Details
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- Definition Amount of assets, excluding financial assets and goodwill, that lack physical substance, having a projected indefinite period of benefit, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=84160947&loc=d3e2207-128464 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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