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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

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