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REINSURANCE (DETAILS) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Premiums written
Gross									$ 4,970,208	$ 4,603,730	$ 4,711,519
Ceded									(1,217,234)	(929,064)	(804,544)
Net									3,752,974	3,674,666	3,906,975
Premiums earned
Gross									4,762,394	4,567,953	4,652,345
Ceded									(1,056,769)	(881,536)	(781,346)
Net	$ 921,879	$ 934,415	$ 946,990	$ 902,340	$ 921,812	$ 919,341	$ 941,211	$ 904,053	3,705,625	3,686,417	3,870,999
Reinsurance receivables:
Ceded losses and loss expenses									(556,000)	(577,000)	$ (401,000)
Provision for unrecoverable reinsurance	$ (20,000)				$ (18,000)				$ (20,000)	$ (18,000)
AM Best A minus Or Better Rating [Member] | Gross Reinsurance Recoverable [Member]
Concentration Risk [Line Items]
Percentage of gross reinsurance recoverables collectible from reinsurers rated A- or better by A.M. Best									96.70%	96.20%

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