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SCHEDULE IV - REINSURANCE (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Abstract] |  |  |
Gross Amount | $ 1,199,824 | $ 1,155,240 | $ 1,084,748
Ceded to Other Companies | 188,729 | 129,337 | 111,391
Assumed From Other Companies | 10,848 | 5,085 | 1,805
Net Amount | $ 1,021,943 | $ 1,030,988 | $ 975,162
Percentage of Amount Assumed to Net | 1.10% | 0.50% | 0.20%

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