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Schedule IV. Supplemental Schedule of Reinsurance Premiums (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Abstract] |  |  |  |  |  |  |  |  |  |  |
Gross Amounts |  |  |  |  |  |  |  |  | $ 292,219 | $ 244,285 | $ 157,112
Ceded to Other Companies |  |  |  |  |  |  |  |  | 1,095,886 | 833,929 | 628,675
Assumed |  |  |  |  |  |  |  |  | 2,779,796 | 2,307,219 | 1,874,993
Net premiums earned (Note 6) | $ 574,613 | $ 531,849 | $ 429,385 | $ 440,282 | $ 421,473 | $ 547,792 | $ 382,265 | $ 366,045 | $ 1,976,129 | $ 1,717,575 | $ 1,403,430
Percentage of Amount Assumed to Net |  |  |  |  |  |  |  |  | 141.00% | 134.00% | 134.00%

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