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SCHEDULE IV - SUPPLEMENTARY REINSURANCE INFORMATION (DETAILS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Supplementary Insurance Information [Line Items]
DIRECT GROSS PREMIUM	$ 2,031,565	$ 2,009,974	$ 1,974,915
CEDED TO OTHER COMPANIES	929,064	804,544	768,841
ASSUMED FROM OTHER COMPANIES	2,572,165	2,701,545	2,722,126
NET AMOUNT	$ 3,674,666	$ 3,906,975	$ 3,928,200
PERCENTAGE OF AMOUNT ASSUMED TO NET	70.00%	69.10%	69.30%
Property and Casualty [Member]
Supplementary Insurance Information [Line Items]
DIRECT GROSS PREMIUM	$ 1,901,757	$ 1,882,695	$ 1,920,203
CEDED TO OTHER COMPANIES	910,917	786,555	767,374
ASSUMED FROM OTHER COMPANIES	2,350,680	2,548,174	2,508,363
NET AMOUNT	$ 3,341,520	$ 3,644,314	$ 3,661,192
PERCENTAGE OF AMOUNT ASSUMED TO NET	70.30%	69.90%	68.50%
Accident and Health [Member]
Supplementary Insurance Information [Line Items]
DIRECT GROSS PREMIUM	$ 129,808	$ 127,279	$ 54,712
CEDED TO OTHER COMPANIES	18,147	17,989	1,467
ASSUMED FROM OTHER COMPANIES	221,485	153,371	213,763
NET AMOUNT	$ 333,146	$ 262,661	$ 267,008
PERCENTAGE OF AMOUNT ASSUMED TO NET	66.50%	58.40%	80.10%

X

- Definition

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

+ References

No definition available.

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X

- Definition

Amount of written premiums assumed from other entities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 605
-Section 50
-Paragraph 1
-Subparagraph (b)(2),(c)(2)
-URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547

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X

- Definition

Amount of written premiums ceded to other entities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 605
-Section 50
-Paragraph 1
-Subparagraph (b),(c)(2)
-URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 17
-Article 12

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X

- 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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 605
-Section 50
-Paragraph 1
-Subparagraph (b),(c)(1)
-URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 17
-Article 12

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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X

- Definition

Amount of actual written premiums, including, as applicable, premiums from reinsurance assumed and net of premiums on reinsurance ceded.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 235
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-16)
-URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574960-122915

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