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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) | 9 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Accounting Standards Update | us-gaap:AccountingStandardsUpdate201613Member |  |  |  |  |  |
Stockholders' Equity Attributable to Parent | $ 5,265,895,000 |  |  | $ 5,544,008,000 | $ 5,585,870,000 |  |
Premiums receivable | 3,131,791,000 |  |  | 3,071,390,000 |  |  |
Allowance for credit loss | 10,727,000 |  |  | 7,000,000 |  |  |
Reinsurance recoverable | 4,337,683,000 |  |  | 3,877,756,000 | 3,705,793,000 |  | $ 3,501,669,000
Allowance for credit losses on reinsurance recoverable for unpaid losses and loss expenses | 22,825,000 |  |  | 18,000,000 |  |  |
Mortgage loans, held for investment, at fair value | 544,095,000 |  |  | 432,748,000 |  |  |
Credit losses associated with commercial mortgage loans | 0 |  |  | 0 |  |  |
Fixed maturities, available for sale, allowance for credit loss | $ 2,498,000 | $ 6,257,000 |  | $ 0 | $ 0 | $ 0 | $ 0
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent |  |  | $ 0 |  |  |  |

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