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SCHEDULE IV - SUPPLEMENTARY REINSURANCE INFORMATION (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Supplementary Insurance Information [Line Items] |  |  |
GROSS AMOUNT | $ 3,275,997 | $ 3,468,040 | $ 2,423,126
CEDED TO OTHER COMPANIES | 2,409,243 | 2,251,103 | 1,529,130
ASSUMED FROM OTHER COMPANIES | 3,622,861 | 3,442,025 | 3,133,147
NET AMOUNT | $ 4,489,615 | $ 4,658,962 | $ 4,027,143
PERCENTAGE OF AMOUNT ASSUMED TO NET | 80.70% | 73.90% | 77.80%
Property and Casualty |  |  |
Supplementary Insurance Information [Line Items] |  |  |
GROSS AMOUNT | $ 3,134,462 | $ 3,258,999 | $ 2,228,022
CEDED TO OTHER COMPANIES | 2,311,001 | 2,163,417 | 1,523,662
ASSUMED FROM OTHER COMPANIES | 3,187,623 | 3,074,906 | 2,814,173
NET AMOUNT | $ 4,011,084 | $ 4,170,488 | $ 3,518,533
PERCENTAGE OF AMOUNT ASSUMED TO NET | 79.50% | 73.70% | 80.00%
Accident and health |  |  |
Supplementary Insurance Information [Line Items] |  |  |
GROSS AMOUNT | $ 141,535 | $ 209,041 | $ 195,104
CEDED TO OTHER COMPANIES | 98,242 | 87,686 | 5,468
ASSUMED FROM OTHER COMPANIES | 435,238 | 367,119 | 318,974
NET AMOUNT | $ 478,531 | $ 488,474 | $ 508,610
PERCENTAGE OF AMOUNT ASSUMED TO NET | 91.00% | 75.20% | 62.70%

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- Definition Amount of written premiums assumed from other entities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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- Definition Amount, before premiums ceded to other entities and premiums assumed by the entity, of premiums written. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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- Definition Amount, after premiums ceded and assumed, of premium written, disclosed in supplementary insurance information. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16(Column K)) -URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574960-122915 + Details
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