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SCHEDULE IV - SUPPLEMENTARY REINSURANCE INFORMATION (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Supplementary Insurance Information [Line Items] |  |  |
DIRECT GROSS PREMIUM | $ 3,468,040 | $ 2,423,126 | $ 2,112,178
CEDED TO OTHER COMPANIES | 2,251,103 | 1,529,130 | 1,217,234
ASSUMED FROM OTHER COMPANIES | 3,442,025 | 3,133,147 | 2,858,030
NET AMOUNT | $ 4,658,962 | $ 4,027,143 | $ 3,752,974
PERCENTAGE OF AMOUNT ASSUMED TO NET | 73.90% | 77.80% | 76.20%
Property and Casualty |  |  |
Supplementary Insurance Information [Line Items] |  |  |
DIRECT GROSS PREMIUM | $ 3,258,999 | $ 2,228,022 | $ 1,975,497
CEDED TO OTHER COMPANIES | 2,163,417 | 1,523,662 | 1,215,775
ASSUMED FROM OTHER COMPANIES | 3,074,906 | 2,814,173 | 2,564,606
NET AMOUNT | $ 4,170,488 | $ 3,518,533 | $ 3,324,328
PERCENTAGE OF AMOUNT ASSUMED TO NET | 73.70% | 80.00% | 77.10%
Accident and health |  |  |
Supplementary Insurance Information [Line Items] |  |  |
DIRECT GROSS PREMIUM | $ 209,041 | $ 195,104 | $ 136,681
CEDED TO OTHER COMPANIES | 87,686 | 5,468 | 1,459
ASSUMED FROM OTHER COMPANIES | 367,119 | 318,974 | 293,424
NET AMOUNT | $ 488,474 | $ 508,610 | $ 428,646
PERCENTAGE OF AMOUNT ASSUMED TO NET | 75.20% | 62.70% | 68.50%

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