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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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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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-Publisher FASB
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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=34713774&loc=d3e574960-122915

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