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Segment reporting - Operating Segments (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
segment
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Segment Reporting [Abstract]                      
Number of operating segments | segment                 4    
Segment Reporting Information [Line Items]                      
Gross premiums written $ 190,358 $ 124,737 $ 147,740 $ 125,705 $ 191,203 $ 184,856 $ 149,035 $ 143,320 $ 588,540 $ 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
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
Loss and loss adjustment expenses incurred, net 177,919 110,487 89,106 87,786 140,394 85,703 82,334 95,068 465,298 403,499 438,414
Acquisition costs, net 39,321 54,817 43,671 49,253 61,851 118,271 58,006 57,498 187,062 295,626 206,498
Other underwriting expenses 9,714 6,072 7,793 7,221 8,336 7,286 9,636 8,839 30,800 34,097 29,667
Net underwriting loss                 (72,308) (33,080) (53,137)
Net investment income (loss) 204,798 121,956 137,211 (185,027) 61,614 (3,138) 69,131 154,953 278,938 282,560 (251,433)
Net corporate and other expenses (10,957) (14,965) (8,878) (6,415) (8,033) (7,009) (13,825) (7,418) (41,215) (36,285) (16,184)
Interest expense (2,068) (2,068) (2,046) (2,048) (2,074) (2,074) (2,051) (2,029) (8,230) (8,228) (8,228)
Foreign exchange (gains) losses (8,348) (5,885) 797 8,217 (10,298) 4,921 4,260 (2,518) (5,219) (3,635) 7,503
Income (loss) before income tax (expense) benefit $ 138,486 $ 69,374 $ 127,324 $ (183,218) $ 29,020 $ (15,312) $ 52,991 $ 134,633 $ 151,966 $ 201,332 $ (321,479)
Underwriting ratios:                      
Loss ratio                 76.20% 57.60% 70.50%
Acquisition cost ratio                 30.60% 42.20% 33.20%
Other underwriting expense ratio                 5.00% 4.90% 4.80%
Combined ratio                 111.80% 104.70% 108.50%
A&H                      
Segment Reporting Information [Line Items]                      
Gross premiums written                 $ 3,392 $ 4,587 $ 3,225
Net premiums written                 3,392 4,587 3,225
Net premiums earned                 3,207 4,665 3,098
Loss and loss adjustment expenses incurred, net                 3,319 3,907 2,624
Acquisition costs, net                 313 365 540
Other underwriting expenses                 114 156 93
Net underwriting loss                 $ (539) $ 237 $ (159)
Underwriting ratios:                      
Loss ratio                 103.50% 83.80% 84.70%
Acquisition cost ratio                 9.80% 7.80% 17.40%
Other underwriting expense ratio                 3.60% 3.30% 3.00%
Combined ratio                 116.90% 94.90% 105.10%
Specialty                      
Segment Reporting Information [Line Items]                      
Gross premiums written                 $ 368,722 $ 420,982 $ 489,691
Net premiums written                 349,783 412,085 485,522
Net premiums earned                 407,951 465,426 466,524
Loss and loss adjustment expenses incurred, net                 342,596 313,750 315,632
Acquisition costs, net                 112,464 149,497 156,533
Other underwriting expenses                 18,744 20,144 18,314
Net underwriting loss                 $ (65,853) $ (17,965) $ (23,955)
Underwriting ratios:                      
Loss ratio                 84.00% 67.40% 67.70%
Acquisition cost ratio                 27.60% 32.10% 33.60%
Other underwriting expense ratio                 4.60% 4.30% 3.90%
Combined ratio                 116.20% 103.80% 105.20%
Property                      
Segment Reporting Information [Line Items]                      
Gross premiums written                 $ 187,480 $ 155,208 $ 83,051
Net premiums written                 160,075 152,729 83,051
Net premiums earned                 171,556 141,477 77,208
Loss and loss adjustment expenses incurred, net                 119,455 90,577 59,411
Acquisition costs, net                 48,744 54,769 37,235
Other underwriting expenses                 6,036 4,722 2,315
Net underwriting loss                 $ (2,679) $ (8,591) $ (21,753)
Underwriting ratios:                      
Loss ratio                 69.60% 64.00% 76.90%
Acquisition cost ratio                 28.40% 38.70% 48.20%
Other underwriting expense ratio                 3.50% 3.30% 3.00%
Combined ratio                 101.50% 106.00% 128.10%
Runoff & Other                      
Segment Reporting Information [Line Items]                      
Gross premiums written                 $ 28,946 $ 87,637 $ 74,220
Net premiums written                 28,946 87,637 74,220
Net premiums earned                 28,138 88,574 74,612
Loss and loss adjustment expenses incurred, net                 (72) (4,735) 60,747
Acquisition costs, net                 25,541 90,995 12,190
Other underwriting expenses                 5,906 9,075 8,945
Net underwriting loss                 $ (3,237) $ (6,761) $ (7,270)