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Reinsurance (Reinsurance Financial Information) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Reinsurance Disclosures [Abstract] |  |  |
Written premiums, Direct | $ 10,695,138 | $ 9,531,050 | $ 7,874,050
Written premiums, Assumed | 1,213,914 | 1,169,084 | 973,597
Written premiums, Ceded | (1,904,982) | (1,837,267) | (1,585,210)
Total net premiums written | 10,004,070 | 8,862,867 | 7,262,437
Earned premiums, Direct | 10,217,891 | 8,825,568 | 7,489,470
Earned premiums, Assumed | 1,226,801 | 1,085,804 | 941,321
Earned premiums, Ceded | (1,883,263) | (1,805,341) | (1,499,948)
Net premiums earned | 9,561,429 | 8,106,031 | 6,930,843
Ceded losses and loss expenses incurred | 1,269,338 | 1,236,960 | 955,630
Ceded commission earned | 477,437 | 449,739 | 358,253
Uncollectible reinsurance | $ 8,064 | $ 7,713 | $ 7,801

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