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REINSURANCE (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
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
Premiums written |  |  |  |  |  |  |  |  |  |  |
Gross |  |  |  |  |  |  |  |  | $ 6,910,065 | $ 5,556,273 | $ 4,970,208
Ceded |  |  |  |  |  |  |  |  | (2,251,103) | (1,529,130) | (1,217,234)
Net |  |  |  |  |  |  |  |  | 4,658,962 | 4,027,143 | 3,752,974
Premiums earned |  |  |  |  |  |  |  |  |  |  |
Gross |  |  |  |  |  |  |  |  | 6,882,217 | 5,616,234 | 4,762,394
Ceded |  |  |  |  |  |  |  |  | (2,090,722) | (1,467,474) | (1,056,769)
Net | $ 1,214,469 | $ 1,224,075 | $ 1,185,548 | $ 1,167,402 | $ 1,211,495 | $ 1,017,131 | $ 981,431 | $ 938,703 | 4,791,495 | 4,148,760 | 3,705,625
Reinsurance receivables: |  |  |  |  |  |  |  |  |  |  |
Ceded losses and loss expenses |  |  |  |  |  |  |  |  | (1,565,000) | (1,010,000) | (556,000)
Provision for unrecoverable reinsurance | $ 21,000 |  |  |  | $ 17,000 |  |  |  | $ 21,000 | $ 17,000 | $ 20,000

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