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SEGMENT INFORMATION (DETAILS 3) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenue from External Customer [Line Items]
Net premiums earned	$ 921,812	$ 919,341	$ 941,211	$ 904,053	$ 958,517	$ 966,138	$ 1,000,400	$ 945,949	$ 3,686,417	$ 3,870,999	$ 3,707,065
Insurance [Member]
Revenue from External Customer [Line Items]
Net premiums earned									1,798,191	1,830,544	1,722,762
Insurance [Member] | Property [Member]
Revenue from External Customer [Line Items]
Net premiums earned									432,587	444,197	462,364
Insurance [Member] | Marine [Member]
Revenue from External Customer [Line Items]
Net premiums earned									183,696	178,229	179,057
Insurance [Member] | Terrorism [Member]
Revenue from External Customer [Line Items]
Net premiums earned									36,818	35,876	39,298
Insurance [Member] | Aviation [Member]
Revenue from External Customer [Line Items]
Net premiums earned									45,659	41,192	48,489
Insurance [Member] | Credit and political risk [Member]
Revenue from External Customer [Line Items]
Net premiums earned									63,583	63,095	68,192
Insurance [Member] | Professional lines [Member]
Revenue from External Customer [Line Items]
Net premiums earned									596,430	629,365	586,200
Insurance [Member] | Liability [Member]
Revenue from External Customer [Line Items]
Net premiums earned									161,614	146,819	110,623
Insurance [Member] | Accident and health [Member]
Revenue from External Customer [Line Items]
Net premiums earned									277,804	291,771	228,539
Reinsurance [Member]
Revenue from External Customer [Line Items]
Net premiums earned									1,888,226	2,040,455	1,984,303
Reinsurance [Member] | Catastrophe [Member]
Revenue from External Customer [Line Items]
Net premiums earned									216,020	325,307	380,199
Reinsurance [Member] | Property [Member]
Revenue from External Customer [Line Items]
Net premiums earned									306,083	312,443	350,970
Reinsurance [Member] | Professional lines [Member]
Revenue from External Customer [Line Items]
Net premiums earned									310,915	336,058	304,754
Reinsurance [Member] | Credit and surety [Member]
Revenue from External Customer [Line Items]
Net premiums earned									250,208	263,013	279,943
Reinsurance [Member] | Motor [Member]
Revenue from External Customer [Line Items]
Net premiums earned									299,883	268,678	221,844
Reinsurance [Member] | Liability [Member]
Revenue from External Customer [Line Items]
Net premiums earned									297,000	289,223	234,736
Reinsurance [Member] | Agriculture [Member]
Revenue from External Customer [Line Items]
Net premiums earned									129,346	164,628	126,490
Reinsurance [Member] | Engineering [Member]
Revenue from External Customer [Line Items]
Net premiums earned									61,043	61,143	66,243
Reinsurance [Member] | Other [Member]
Revenue from External Customer [Line Items]
Net premiums earned									$ 17,728	$ 19,962	$ 19,124

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Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.1)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

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

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.13(c))
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 235
-Section S99
-Paragraph 2
-Subparagraph (SX 210.12-17)
-URI http://asc.fasb.org/extlink&oid=34713774&loc=d3e574992-122915

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