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Segment Reporting - Segment Reporting Information (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
segment
Sep. 30, 2022
USD ($)
Segment Reporting Information [Line Items]        
Number of reportable segments | segment     2  
Gross premiums written $ 474,123 $ 400,811 $ 1,517,247 $ 1,305,421
Net premiums written 383,566 300,811 1,116,772 938,488
Net premiums earned 337,036 294,943 952,398 831,467
Third party fee income 2,301 3,244 7,753 9,377
Losses and loss adjustment expenses 191,577 257,963 519,554 597,014
Acquisition costs 78,537 65,735 220,532 194,795
Other underwriting expenses 44,357 40,564 126,242 119,356
Underwriting income (loss) 24,866 (66,075) 93,823 (70,321)
Net realized and unrealized gains (losses) on investments 47,343 (67,380) 101,881 146,640
Net investment income (loss) 8,069 (5,255) 17,719 (22,185)
Other income (loss), excluding third party fee income 85 (517) 85 (260)
Net foreign exchange gains (losses) 1,432 1,906 (3,953) 15,382
Corporate expenses (18,678) (5,780) (31,833) (15,934)
Amortization of intangible assets (2,794) (3,178) (7,869) (9,874)
Interest expense (5,288) (4,102) (16,007) (11,255)
Income (loss) before income tax 55,035 (150,381) 153,846 32,193
Income tax expense (2,387) (1,054) (6,908) (3,103)
Net income (loss) 52,648 (151,435) 146,938 29,090
Net income (loss) attributable to non-controlling interest 9,065 (15,318) 15,076 68,069
Net income (loss) and other comprehensive income (loss) attributable to common shareholders $ 43,583 $ (136,117) $ 131,862 $ (38,979)
Attritional loss ratio - current year 54.80% 49.60% 51.80% 49.50%
Attritional loss ratio - prior year development (0.10%) 10.20% (0.40%) 1.40%
Catastrophe loss ratio - current year 3.90% 28.30% 3.70% 22.70%
Catastrophe loss ratio - prior year development (1.80%) (0.60%) (0.50%) (1.80%)
Loss and loss adjustment expense ratio 56.80% 87.50% 54.60% 71.80%
Acquisition cost ratio 23.30% 22.30% 23.20% 23.40%
Other underwriting expense ratio 12.50% 12.70% 12.40% 13.30%
Combined ratio 92.60% 122.50% 90.20% 108.50%
Operating Segments | International        
Segment Reporting Information [Line Items]        
Gross premiums written $ 307,140 $ 269,228 $ 832,049 $ 698,968
Net premiums written 234,621 184,319 553,687 446,577
Net premiums earned 178,632 156,307 504,784 450,202
Third party fee income 2,115 3,138 7,417 9,022
Losses and loss adjustment expenses 97,820 92,061 255,787 249,840
Acquisition costs 47,236 41,936 131,688 122,593
Other underwriting expenses 31,634 26,811 89,635 82,256
Underwriting income (loss) $ 4,057 $ (1,363) $ 35,091 $ 4,535
Attritional loss ratio - current year 54.60% 46.70% 52.60% 47.40%
Attritional loss ratio - prior year development (5.30%) (0.10%) (4.30%) (3.50%)
Catastrophe loss ratio - current year 5.10% 11.90% 2.20% 10.50%
Catastrophe loss ratio - prior year development 0.40% 0.40% 0.20% 1.10%
Loss and loss adjustment expense ratio 54.80% 58.90% 50.70% 55.50%
Acquisition cost ratio 26.40% 26.80% 26.10% 27.20%
Other underwriting expense ratio 16.50% 15.20% 16.30% 16.30%
Combined ratio 97.70% 100.90% 93.10% 99.00%
Operating Segments | Bermuda        
Segment Reporting Information [Line Items]        
Gross premiums written $ 166,983 $ 131,583 $ 685,198 $ 606,453
Net premiums written 148,945 116,492 563,085 491,911
Net premiums earned 158,404 138,636 447,614 381,265
Third party fee income 186 106 336 355
Losses and loss adjustment expenses 93,757 165,902 263,767 347,174
Acquisition costs 31,301 23,799 88,844 72,202
Other underwriting expenses 12,723 13,753 36,607 37,100
Underwriting income (loss) $ 20,809 $ (64,712) $ 58,732 $ (74,856)
Attritional loss ratio - current year 55.10% 53.00% 50.80% 52.10%
Attritional loss ratio - prior year development 5.70% 21.70% 4.00% 7.20%
Catastrophe loss ratio - current year 2.60% 46.80% 5.40% 37.00%
Catastrophe loss ratio - prior year development (4.20%) (1.80%) (1.30%) (5.20%)
Loss and loss adjustment expense ratio 59.20% 119.70% 58.90% 91.10%
Acquisition cost ratio 19.80% 17.20% 19.80% 18.90%
Other underwriting expense ratio 7.90% 9.80% 8.10% 9.60%
Combined ratio 86.90% 146.70% 86.80% 119.60%
Corporate        
Segment Reporting Information [Line Items]        
Gross premiums written $ 0 $ 0 $ 0 $ 0
Net premiums written 0 0 0 0
Net premiums earned 0 0 0 0
Third party fee income 0 0 0 0
Losses and loss adjustment expenses 0 0 0 0
Acquisition costs 0 0 0 0
Other underwriting expenses 0 0 0 0
Underwriting income (loss) 0 0 0 0
Net realized and unrealized gains (losses) on investments 47,343 (67,380) 101,881 146,640
Net investment income (loss) 8,069 (5,255) 17,719 (22,185)
Other income (loss), excluding third party fee income 85 (517) 85 (260)
Net foreign exchange gains (losses) 1,432 1,906 (3,953) 15,382
Corporate expenses (18,678) (5,780) (31,833) (15,934)
Amortization of intangible assets (2,794) (3,178) (7,869) (9,874)
Interest expense (5,288) (4,102) (16,007) (11,255)
Income tax expense (2,387) (1,054) (6,908) (3,103)
Net income (loss) attributable to non-controlling interest $ 9,065 $ (15,318) $ 15,076 $ 68,069