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SCHEDULE III - SUPPLEMENTARY INSURANCE INFORMATION (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Supplementary Insurance Information [Line Items] |  |  |
Deferred acquisition costs | $ 566,622 | $ 474,061 | $ 438,636
Reserve for losses and loss expenses | 12,280,769 | 12,997,553 | 9,697,827
Unearned premiums | 3,635,758 | 3,641,399 | 2,969,498
Net premiums earned | 4,791,495 | 4,148,760 | 3,705,625
Net Investment Income | 438,507 | 400,805 | 353,335
Net losses and loss expenses | 3,190,287 | 3,287,772 | 2,204,197
Acquisition costs | 968,835 | 823,591 | 746,876
Other Operating Expenses | 627,389 | 579,428 | 602,717
Net premiums written | 4,658,962 | 4,027,143 | 3,752,974
Operating Segments | Insurance |  |  |
Supplementary Insurance Information [Line Items] |  |  |
Deferred acquisition costs | 209,622 | 115,332 | 100,149
Reserve for losses and loss expenses | 6,426,309 | 7,011,805 | 5,198,070
Unearned premiums | 2,061,123 | 2,053,422 | 1,423,891
Net premiums earned | 2,362,606 | 1,816,438 | 1,534,282
Net Investment Income | 0 | 0 | 0
Net losses and loss expenses | 1,494,323 | 1,465,427 | 977,771
Acquisition costs | 399,193 | 270,229 | 206,619
Other Operating Expenses | 395,252 | 325,368 | 327,351
Net premiums written | 2,324,747 | 1,775,825 | 1,519,559
Operating Segments | Reinsurance |  |  |
Supplementary Insurance Information [Line Items] |  |  |
Deferred acquisition costs | 357,000 | 358,729 | 338,487
Reserve for losses and loss expenses | 5,854,460 | 5,985,748 | 4,499,757
Unearned premiums | 1,574,635 | 1,587,977 | 1,545,607
Net premiums earned | 2,428,889 | 2,332,322 | 2,171,343
Net Investment Income | 0 | 0 | 0
Net losses and loss expenses | 1,695,964 | 1,822,345 | 1,226,426
Acquisition costs | 569,642 | 553,362 | 540,257
Other Operating Expenses | 123,916 | 124,115 | 155,350
Net premiums written | 2,334,215 | 2,251,318 | 2,233,415
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 | 438,507 | 400,805 | 353,335
Net losses and loss expenses | 0 | 0 | 0
Acquisition costs | 0 | 0 | 0
Other Operating Expenses | 108,221 | 129,945 | 120,016
Net premiums written | $ 0 | $ 0 | $ 0

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