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v3.19.3.a.u2

Segment reporting - Business Line (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written | $ 134,230 | $ 95,388 | $ 82,637 | $ 319,591 | $ 120,063 | $ 30,064 | $ 49,765 | $ 378,360 | $ 631,846 | $ 578,252 | $ 641,620
Property and Casualty Reinsurance |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written |  |  |  |  |  |  |  |  | $ 631,846 | $ 578,252 | $ 641,620
Gross Premiums As Percentage Of Total Gross Premiums |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
Property and Casualty Reinsurance | Property |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written |  |  |  |  |  |  |  |  | $ 144,271 | $ 9,070 | $ 136,999
Gross Premiums As Percentage Of Total Gross Premiums |  |  |  |  |  |  |  |  | 22.80% | 1.60% | 21.40%
Property and Casualty Reinsurance | Casualty |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written |  |  |  |  |  |  |  |  | $ 151,893 | $ 235,789 | $ 269,759
Gross Premiums As Percentage Of Total Gross Premiums |  |  |  |  |  |  |  |  | 24.00% | 40.80% | 42.00%
Property and Casualty Reinsurance | Specialty |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written |  |  |  |  |  |  |  |  | $ 248,044 | $ 259,173 | $ 125,511
Gross Premiums As Percentage Of Total Gross Premiums |  |  |  |  |  |  |  |  | 39.30% | 44.80% | 19.60%
Property and Casualty Reinsurance | Total prospective reinsurance contracts |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written |  |  |  |  |  |  |  |  | $ 544,208 | $ 504,032 | $ 532,269
Gross Premiums As Percentage Of Total Gross Premiums |  |  |  |  |  |  |  |  | 86.10% | 87.20% | 83.00%
Property and Casualty Reinsurance | Retroactive reinsurance contracts |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross premiums written |  |  |  |  |  |  |  |  | $ 87,638 | $ 74,220 | $ 109,351
Gross Premiums As Percentage Of Total Gross Premiums |  |  |  |  |  |  |  |  | 13.90% | 12.80% | 17.00%

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- Definition Amount of written premiums assumed from other entities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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