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SCHEDULE IV - SUPPLEMENTARY REINSURANCE INFORMATION (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Supplementary Insurance Information [Line Items]
GROSS AMOUNT	$ 3,610,201	$ 3,275,997	$ 3,468,040
CEDED TO OTHER COMPANIES	2,490,529	2,409,243	2,251,103
ASSUMED FROM OTHER COMPANIES	3,216,737	3,622,861	3,442,025
NET AMOUNT	$ 4,336,409	$ 4,489,615	$ 4,658,962
PERCENTAGE OF AMOUNT ASSUMED TO NET	74.20%	80.70%	73.90%
Property and Casualty
Supplementary Insurance Information [Line Items]
GROSS AMOUNT	$ 3,455,690	$ 3,134,462	$ 3,258,999
CEDED TO OTHER COMPANIES	2,446,890	2,311,001	2,163,417
ASSUMED FROM OTHER COMPANIES	2,840,834	3,187,623	3,074,906
NET AMOUNT	$ 3,849,634	$ 4,011,084	$ 4,170,488
PERCENTAGE OF AMOUNT ASSUMED TO NET	73.80%	79.50%	73.70%
Accident and health
Supplementary Insurance Information [Line Items]
GROSS AMOUNT	$ 154,511	$ 141,535	$ 209,041
CEDED TO OTHER COMPANIES	43,639	98,242	87,686
ASSUMED FROM OTHER COMPANIES	375,903	435,238	367,119
NET AMOUNT	$ 486,775	$ 478,531	$ 488,474
PERCENTAGE OF AMOUNT ASSUMED TO NET	77.20%	91.00%	75.20%

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Percentage of assumed premiums written by the entity to net premiums written.

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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

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Amount of written premiums ceded to other entities.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 605
-Section 50
-Paragraph 1
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547

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-Name Accounting Standards Codification
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-SubTopic 605
-Section 50
-Paragraph 1
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547

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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

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Amount, after premiums ceded and assumed, of premium written, disclosed in supplementary insurance information.

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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=120401096&loc=d3e574960-122915

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