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REINSURANCE (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
Premiums written |  |  |  |  |  |  |  |  |  |  |
Gross |  |  |  |  |  |  |  |  | $ 6,898,858 | $ 6,910,065 | $ 5,556,273
Ceded |  |  |  |  |  |  |  |  | (2,409,243) | (2,251,103) | (1,529,130)
Net |  |  |  |  |  |  |  |  | 4,489,615 | 4,658,962 | 4,027,143
Premiums earned |  |  |  |  |  |  |  |  |  |  |
Gross |  |  |  |  |  |  |  |  | 6,910,677 | 6,882,217 | 5,616,234
Ceded |  |  |  |  |  |  |  |  | (2,323,499) | (2,090,722) | (1,467,474)
Net | $ 1,172,051 | $ 1,157,307 | $ 1,123,607 | $ 1,134,212 | $ 1,214,469 | $ 1,224,075 | $ 1,185,548 | $ 1,167,402 | 4,587,178 | 4,791,495 | 4,148,760
Reinsurance receivables: |  |  |  |  |  |  |  |  |  |  |
Ceded losses and loss expenses |  |  |  |  |  |  |  |  | 1,602,000 | 1,565,000 | 1,010,000
Provision for unrecoverable reinsurance | $ 18,000 |  |  |  | $ 21,000 |  |  |  | $ 18,000 | $ 21,000 | $ 17,000

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