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Schedule IV - Reinsurance (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |
Direct gross premiums written |  |  |  |  |  |  |  |  | $ 19,039 | $ 0 | $ 0
Ceded to other companies | $ 17,090 | $ 8,286 | $ 18,423 | $ 2,545 | $ 4,459 | $ 1,928 | $ 2,744 | $ 2,245 | 46,344 | 11,376 | 4,169
Assumed from other companies |  |  |  |  |  |  |  |  | 569,501 | 668,414 | 650,187
Net premiums written | $ 173,268 | $ 116,451 | $ 129,317 | $ 123,160 | $ 186,744 | $ 182,928 | $ 146,291 | $ 141,075 | 542,196 | 657,038 | 646,018
Property and Casualty Reinsurance |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |  |  |  |  |  |  |  |  |
Direct gross premiums written |  |  |  |  |  |  |  |  | 19,039 | 0 | 0
Ceded to other companies |  |  |  |  |  |  |  |  | 46,344 | 11,376 | 4,169
Assumed from other companies |  |  |  |  |  |  |  |  | 569,501 | 668,414 | 650,187
Net premiums written |  |  |  |  |  |  |  |  | $ 542,196 | $ 657,038 | $ 646,018
Percentage of amount assumed to net |  |  |  |  |  |  |  |  | 95.00% | 98.00% | 99.00%

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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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- 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=120401096&loc=d3e574992-122915 + Details
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