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Schedule IV - Reinsurance (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
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ceded to other companies | $ 5,964 | $ 1,116 | $ 1,473 | $ 712 | $ 1,770 | $ 0 | $ 3,479 | $ 14,646 | $ 9,265 | $ 19,895 | $ 2,475
Assumed from other companies | 134,230 | 95,388 | 82,637 | 319,591 | 120,063 | 30,064 | 49,765 | 378,360 | 631,846 | 578,252 | 641,620
Net premiums written | $ 128,266 | $ 94,272 | $ 81,164 | $ 318,879 | $ 118,293 | $ 30,064 | $ 46,286 | $ 363,714 | 622,581 | 558,357 | 639,145
Property and Casualty Reinsurance |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |
Direct gross premiums written |  |  |  |  |  |  |  |  | 0 | 0 | 0
Ceded to other companies |  |  |  |  |  |  |  |  | 9,265 | 19,895 | 2,475
Assumed from other companies |  |  |  |  |  |  |  |  | 631,846 | 578,252 | 641,620
Net premiums written |  |  |  |  |  |  |  |  | $ 622,581 | $ 558,357 | $ 639,145
Percentage of amount assumed to net |  |  |  |  |  |  |  |  | 99.00% | 97.00% | 100.00%

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- Definition Amount, before premiums ceded to other entities and premiums assumed by the entity, of premiums written. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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- Definition Percentage of assumed premium earned to premium earned after effects of reinsurance, as disclosed in supplementary reinsurance information. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17(Column F)) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574992-122915 + Details
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