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DERIVATIVE INSTRUMENTS (Details 3) - USD ($) $ in Thousands	3 Months Ended
DERIVATIVE INSTRUMENTS (Details 3) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016
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	$ (12,623)	$ 450
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	(2,372)	(2,520)
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	439	0
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	(2,758)	3,202
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	(7,932)	(475)
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	$ 0	$ 243