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Schedule III - Supplementary Insurance Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Supplementary Insurance Information, by Segment [Line Items] |  |  |
Deferred Acquisition Costs | $ 872,289 | $ 622,053 | $ 581,863
Reverse for Losses and Loss Adjustment Expenses | 19,009,486 | 16,398,997 | 13,611,313
Unearned Premium Reserves | 4,609,634 | 3,501,359 | 3,056,735
Premiums Earned | 10,406,441 | 8,681,513 | 7,403,686
Net Investment Income | 1,164,892 | 642,465 | 647,139
Incurred Loss and Loss Adjustment Expenses | 7,391,253 | 6,550,837 | 4,922,898
Amortization of Deferred Acquisition Costs | 2,208,766 | 1,873,250 | 1,703,726
Other Operating Expenses | 582,647 | 511,237 | 440,899
Net Written Premium | 11,445,505 | 9,116,983 | 7,824,424
Reinsurance [Member] |  |  |
Supplementary Insurance Information, by Segment [Line Items] |  |  |
Deferred Acquisition Costs | 653,929 | 447,632 | 420,182
Reverse for Losses and Loss Adjustment Expenses | 13,894,992 | 12,023,446 | 10,064,970
Unearned Premium Reserves | 2,722,771 | 1,995,218 | 1,740,357
Premiums Earned | 7,757,483 | 6,466,106 | 5,491,296
Net Investment Income | 823,163 | 458,354 | 458,492
Incurred Loss and Loss Adjustment Expenses | 5,556,444 | 4,933,411 | 3,675,178
Amortization of Deferred Acquisition Costs | 1,854,466 | 1,552,371 | 1,400,247
Other Operating Expenses | 199,148 | 175,734 | 160,834
Net Written Premium | 8,535,618 | 6,767,579 | 5,732,272
Insurance [Member] |  |  |
Supplementary Insurance Information, by Segment [Line Items] |  |  |
Deferred Acquisition Costs | 218,360 | 174,421 | 161,681
Reverse for Losses and Loss Adjustment Expenses | 5,114,494 | 4,375,551 | 3,546,343
Unearned Premium Reserves | 1,886,864 | 1,506,141 | 1,316,378
Premiums Earned | 2,648,957 | 2,215,407 | 1,912,390
Net Investment Income | 341,729 | 184,111 | 188,647
Incurred Loss and Loss Adjustment Expenses | 1,834,809 | 1,617,426 | 1,247,720
Amortization of Deferred Acquisition Costs | 354,300 | 320,879 | 303,479
Other Operating Expenses | 383,499 | 335,503 | 280,065
Net Written Premium | $ 2,909,886 | $ 2,349,404 | $ 2,092,152

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