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Schedule III - Supplementary Insurance Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]      
Deferred acquisition costs, net $ 68,550 $ 92,164 $ 116,946
Loss and loss adjustment expense reserves 1,310,068 1,111,692 937,160
Unearned premium 284,835 336,150 377,750
Net premiums earned 610,852 700,142 621,442
Net investment loss 278,938 282,560 (251,433)
Loss and loss adjustment expenses incurred, net 465,298 403,499 438,414
Amortization of deferred acquisition costs, net 187,062 295,626 206,498
Other operating expenses 72,015 70,382 45,851
Net premiums written 542,196 657,038 646,018
A&H      
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]      
Deferred acquisition costs, net 95 110 114
Loss and loss adjustment expense reserves 3,742 2,923 2,122
Unearned premium 1,015 830 907
Net premiums earned 3,207 4,665 3,098
Net investment loss 0 0 0
Loss and loss adjustment expenses incurred, net 3,319 3,907 2,624
Amortization of deferred acquisition costs, net 313 365 540
Other operating expenses 114 156 93
Net premiums written 3,392 4,587 3,225
Specialty      
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]      
Deferred acquisition costs, net 65,848 81,586 105,961
Loss and loss adjustment expense reserves 948,392 773,141 599,142
Unearned premium 247,538 297,700 350,370
Net premiums earned 407,951 465,426 466,524
Net investment loss 0 0 0
Loss and loss adjustment expenses incurred, net 342,596 313,750 315,632
Amortization of deferred acquisition costs, net 112,464 149,497 156,533
Other operating expenses 18,744 20,144 18,314
Net premiums written 349,783 412,085 485,522
Property      
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]      
Deferred acquisition costs, net 2,597 10,465 10,858
Loss and loss adjustment expense reserves 138,309 99,106 49,980
Unearned premium 32,904 35,050 22,966
Net premiums earned 171,556 141,477 77,208
Net investment loss 0 0 0
Loss and loss adjustment expenses incurred, net 119,455 90,577 59,411
Amortization of deferred acquisition costs, net 48,744 54,769 37,235
Other operating expenses 6,036 4,722 2,315
Net premiums written 160,075 152,729 83,051
Runoff & Other      
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]      
Deferred acquisition costs, net 10 3 13
Loss and loss adjustment expense reserves 219,625 236,522 285,916
Unearned premium 3,378 2,570 3,507
Net premiums earned 28,138 88,574 74,612
Net investment loss 0 0 0
Loss and loss adjustment expenses incurred, net (72) (4,735) 60,747
Amortization of deferred acquisition costs, net 25,541 90,995 12,190
Other operating expenses 5,906 9,075 8,945
Net premiums written 28,946 87,637 74,220
Corporate      
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items]      
Deferred acquisition costs, net 0 0 0
Loss and loss adjustment expense reserves 0 0 0
Unearned premium 0 0 0
Net premiums earned 0 0 0
Net investment loss 278,938 282,560 (251,433)
Loss and loss adjustment expenses incurred, net 0 0 0
Amortization of deferred acquisition costs, net 0 0 0
Other operating expenses 41,215 36,285 16,184
Net premiums written $ 0 $ 0 $ 0