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Schedule IV. Supplemental Schedule of Reinsurance Premiums (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Abstract] |  |  |  |  |  |  |  |  |  |  |
Gross Amounts |  |  |  |  |  |  |  |  | $ 404,525 | $ 292,219 | $ 244,285
Ceded to Other Companies |  |  |  |  |  |  |  |  | 1,414,383 | 1,095,886 | 833,929
Assumed |  |  |  |  |  |  |  |  | 4,348,261 | 2,779,796 | 2,307,219
Net premiums earned (Note 7) | $ 970,125 | $ 906,748 | $ 911,502 | $ 550,028 | $ 574,613 | $ 531,849 | $ 429,385 | $ 440,282 | $ 3,338,403 | $ 1,976,129 | $ 1,717,575
Percentage of Amount Assumed to Net |  |  |  |  |  |  |  |  | 130.00% | 141.00% | 134.00%

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