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Schedule III - Supplementary Insurance Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred acquisition costs, net | $ 154,717 | $ 203,842 | $ 258,793
Loss and loss adjustment expense reserves | 1,111,692 | 937,157 | 720,570
Unearned premium | 524,768 | 602,936 | 649,518
Net premiums earned | 700,142 | 621,442 | 547,058
Net investment income | 282,560 | (251,433) | 391,953
Other expenses | 16,619 | 9,610 | 12,674
Loss and loss adjustment expenses incurred, net | 403,499 | 438,414 | 370,058
Amortization of deferred acquisition costs, net | 295,626 | 206,498 | 188,904
Other operating expenses | 53,763 | 36,241 | 53,103
Net premiums written | 622,581 | 558,357 | 639,145
Property and Casualty Reinsurance |  |  |
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Line Items] |  |  |
Deferred acquisition costs, net | 154,717 | 203,842 | 258,793
Loss and loss adjustment expense reserves | 1,111,692 | 937,157 | 720,570
Unearned premium | 524,768 | 602,936 | 649,518
Net premiums earned | 700,142 | 621,442 | 547,058
Net investment income | 0 | 0 | 0
Other expenses | 0 | 0 | 0
Loss and loss adjustment expenses incurred, net | 403,499 | 438,414 | 370,058
Amortization of deferred acquisition costs, net | 295,626 | 206,498 | 188,904
Other operating expenses | 23,366 | 18,635 | 30,656
Net premiums written | 622,581 | 558,357 | 639,145
Corporate (1) |  |  |
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 income | 282,560 | (251,433) | 391,953
Other expenses | 16,619 | 9,610 | 12,674
Loss and loss adjustment expenses incurred, net | 0 | 0 | 0
Amortization of deferred acquisition costs, net | 0 | 0 | 0
Other operating expenses | 30,397 | 17,606 | 22,447
Net premiums written | $ 0 | $ 0 | $ 0

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