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DERIVATIVE INSTRUMENTS (DETAILS 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Unrealized and Realized Gains (Losses) Recognized in Earnings for Derivatives Not Designated As Hedges [Line Items]
Unrealized and realized gains (losses) recognized in earnings for derivatives not designated as hedges	$ (10,717)	$ (15,755)	$ (4,455)	$ (661)
Investment Portfolio [Member] \| Foreign Exchange Forward Contracts [Member] \| Net Realized Investment Gains (Losses) [Member]
Unrealized and Realized Gains (Losses) Recognized in Earnings for Derivatives Not Designated As Hedges [Line Items]
Unrealized and realized gains (losses) recognized in earnings for derivatives not designated as hedges	7,034	(7,802)	3,350	9,222
Investment Portfolio [Member] \| Interest Rate Swap [Member] \| Net Realized Investment Gains (Losses) [Member]
Unrealized and Realized Gains (Losses) Recognized in Earnings for Derivatives Not Designated As Hedges [Line Items]
Unrealized and realized gains (losses) recognized in earnings for derivatives not designated as hedges	(4,034)	(5,256)	(12,994)	(4,988)
Underwriting Portfolio [Member] \| Foreign Exchange Forward Contracts [Member] \| Foreign Exchange Gains (Losses) [Member]
Unrealized and Realized Gains (Losses) Recognized in Earnings for Derivatives Not Designated As Hedges [Line Items]
Unrealized and realized gains (losses) recognized in earnings for derivatives not designated as hedges	(21,915)	(2,697)	(8,784)	(4,895)
Underwriting Portfolio [Member] \| Weather Related Derivative [Member] \| Other Insurance Related Income [Member]
Unrealized and Realized Gains (Losses) Recognized in Earnings for Derivatives Not Designated As Hedges [Line Items]
Unrealized and realized gains (losses) recognized in earnings for derivatives not designated as hedges	668	0	4,730	0
Underwriting Portfolio [Member] \| Commodity Contract [Member] \| Other Insurance Related Income [Member]
Unrealized and Realized Gains (Losses) Recognized in Earnings for Derivatives Not Designated As Hedges [Line Items]
Unrealized and realized gains (losses) recognized in earnings for derivatives not designated as hedges	$ 7,530	$ 0	$ 9,243	$ 0