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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