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REINSURANCE (DETAILS) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Premiums written |  |  |  |  |  |  |  |  |  |  |
Gross |  |  |  |  |  |  |  |  | $ 4,603,730 | $ 4,711,519 | $ 4,697,041
Ceded |  |  |  |  |  |  |  |  | (929,064) | (804,544) | (768,841)
Net |  |  |  |  |  |  |  |  | 3,674,666 | 3,906,975 | 3,928,200
Premiums earned |  |  |  |  |  |  |  |  |  |  |
Gross |  |  |  |  |  |  |  |  | 4,567,953 | 4,652,345 | 4,459,269
Ceded |  |  |  |  |  |  |  |  | (881,536) | (781,346) | (752,204)
Net | $ 921,812 | $ 919,341 | $ 941,211 | $ 904,053 | $ 958,517 | $ 966,138 | $ 1,000,400 | $ 945,949 | 3,686,417 | 3,870,999 | 3,707,065
Reinsurance receivables: |  |  |  |  |  |  |  |  |  |  |
Ceded losses and loss expenses |  |  |  |  |  |  |  |  | 577,000 | 401,000 | $ 415,000
Provision for unrecoverable reinsurance | $ 18,000 |  |  |  | $ 18,000 |  |  |  | $ 18,000 | $ 18,000 |
AM Best A minus Or Better Rating [Member] | Gross Reinsurance Recoverable [Member] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of gross reinsurance recoverables collectible from reinsurers rated A- or better by A.M. Best |  |  |  |  |  |  |  |  | 96.20% | 98.50% |

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