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REINSURANCE (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Premiums written |  |  |  |  |  |  |  |  |  |  |
Gross |  |  |  |  |  |  |  |  | $ 5,556,273 | $ 4,970,208 | $ 4,603,730
Ceded |  |  |  |  |  |  |  |  | (1,529,130) | (1,217,234) | (929,064)
Net |  |  |  |  |  |  |  |  | 4,027,143 | 3,752,974 | 3,674,666
Premiums earned |  |  |  |  |  |  |  |  |  |  |
Gross |  |  |  |  |  |  |  |  | 5,616,234 | 4,762,394 | 4,567,953
Ceded |  |  |  |  |  |  |  |  | (1,467,474) | (1,056,769) | (881,536)
Net | $ 1,211,495 | $ 1,017,131 | $ 981,431 | $ 938,703 | $ 921,879 | $ 934,415 | $ 946,990 | $ 902,340 | 4,148,760 | 3,705,625 | 3,686,417
Reinsurance receivables: |  |  |  |  |  |  |  |  |  |  |
Ceded losses and loss expenses |  |  |  |  |  |  |  |  | (1,010,000) | (556,000) | $ (577,000)
Provision for unrecoverable reinsurance | $ (17,000) |  |  |  | $ (20,000) |  |  |  | $ (17,000) | $ (20,000) |
AM Best A minus Or Better Rating | Gross Reinsurance Recoverable |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of gross reinsurance recoverables collectible from reinsurers rated A- or better by A.M. Best |  |  |  |  |  |  |  |  | 88.80% | 96.70% |

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- Definition Amount of earned premiums ceded to other entities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.1) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b),(c)(2) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84167274&loc=d3e27175-158546 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574992-122915 + Details
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