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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
Supplementary Insurance Information [Line Items] |  |  |
Deferred acquisition costs | $ 492,119 | $ 566,622 | $ 474,061
Reserve for losses and loss expenses | 12,752,081 | 12,280,769 | 12,997,553
Unearned premiums | 3,626,246 | 3,635,758 | 3,641,399
Net premiums earned | 4,587,178 | 4,791,495 | 4,148,760
Net investment income | 478,572 | 438,507 | 400,805
Net losses and loss expenses | 3,044,798 | 3,190,287 | 3,287,772
Acquisition costs | 1,024,582 | 968,835 | 823,591
Other operating expenses | 634,831 | 627,389 | 579,428
Net premiums written | 4,489,615 | 4,658,962 | 4,027,143
General and administrative expenses | 634,831 | 627,389 | 579,428
Operating Segments |  |  |
Supplementary Insurance Information [Line Items] |  |  |
General and administrative expenses | 505,735 | 519,168 | 449,483
Operating Segments | Insurance |  |  |
Supplementary Insurance Information [Line Items] |  |  |
Deferred acquisition costs | 191,925 | 209,622 | 115,332
Reserve for losses and loss expenses | 6,496,568 | 6,426,309 | 7,011,805
Unearned premiums | 2,115,664 | 2,061,123 | 2,053,422
Net premiums earned | 2,190,084 | 2,362,606 | 1,816,438
Net investment income | 0 | 0 | 0
Net losses and loss expenses | 1,278,679 | 1,494,323 | 1,465,427
Acquisition costs | 468,281 | 399,193 | 270,229
Other operating expenses | 401,963 | 395,252 | 325,368
Net premiums written | 2,209,155 | 2,324,747 | 1,775,825
General and administrative expenses | 401,963 | 395,252 | 325,368
Operating Segments | Reinsurance |  |  |
Supplementary Insurance Information [Line Items] |  |  |
Deferred acquisition costs | 300,194 | 357,000 | 358,729
Reserve for losses and loss expenses | 6,255,513 | 5,854,460 | 5,985,748
Unearned premiums | 1,510,582 | 1,574,635 | 1,587,977
Net premiums earned | 2,397,094 | 2,428,889 | 2,332,322
Net investment income | 0 | 0 | 0
Net losses and loss expenses | 1,766,119 | 1,695,964 | 1,822,345
Acquisition costs | 556,301 | 569,642 | 553,362
Other operating expenses | 103,772 | 123,916 | 124,115
Net premiums written | 2,280,460 | 2,334,215 | 2,251,318
General and administrative expenses | 103,772 | 123,916 | 124,115
Corporate |  |  |
Supplementary Insurance Information [Line Items] |  |  |
Deferred acquisition costs | 0 | 0 | 0
Reserve for losses and loss expenses | 0 | 0 | 0
Unearned premiums | 0 | 0 | 0
Net premiums earned | 0 | 0 | 0
Net investment income | 478,572 | 438,507 | 400,805
Net losses and loss expenses | 0 | 0 | 0
Acquisition costs | 0 | 0 | 0
Other operating expenses | 129,096 | 108,221 | 129,945
Net premiums written | 0 | 0 | 0
General and administrative expenses | $ 129,096 | $ 108,221 | $ 129,945

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