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v3.21.1

Segment reporting - Effects of Reinsurance (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
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
Segment Reporting [Abstract] |  |  |  |  |  |  |  |  |  |  |
Direct gross premiums written |  |  |  |  |  |  |  |  | $ 19,039 | $ 0 | $ 0
Assumed from other companies |  |  |  |  |  |  |  |  | 569,501 | 668,414 | 650,187
Premiums Written, Gross | $ 190,358 | $ 124,737 | $ 147,740 | $ 125,705 | $ 191,203 | $ 184,856 | $ 149,035 | $ 143,320 | 588,540 | 668,414 | 650,187
Gross premiums ceded | (17,090) | (8,286) | (18,423) | (2,545) | (4,459) | (1,928) | (2,744) | (2,245) | (46,344) | (11,376) | (4,169)
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
Direct Premiums Earned |  |  |  |  |  |  |  |  | 1,038 | 0 | 0
Assumed Premiums Earned |  |  |  |  |  |  |  |  | 638,817 | 710,014 | 624,834
Premiums Earned, Gross |  |  |  |  |  |  |  |  | 639,855 | 710,014 | 624,834
Ceded Premiums Earned |  |  |  |  |  |  |  |  | (29,003) | (9,872) | (3,392)
Net premiums earned | $ 182,015 | $ 141,712 | $ 140,810 | $ 146,315 | $ 198,392 | $ 203,248 | $ 145,452 | $ 153,050 | $ 610,852 | $ 700,142 | $ 621,442

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