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DERIVATIVE INSTRUMENTS (DETAILS) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Derivative Fair Values on Consolidated Balance Sheet [Line Items]
Asset Derivative Fair Value	$ 6,146	$ 38,175
Liability Derivative Fair Value	9,571	2,035
Foreign Exchange Forward Contracts [Member] \| Designated As Hedging Instrument [Member] \| Fair Value Hedge [Member]
Derivative Fair Values on Consolidated Balance Sheet [Line Items]
Asset Derivative Fair Value	0	16,519
Liability Derivative Fair Value	3,313	0
Derivative Notional Amount	189,201	540,176
Foreign Exchange Forward Contracts [Member] \| Not Designated as Hedging Instruments [Member] \| Investment Portfolio [Member]
Derivative Fair Values on Consolidated Balance Sheet [Line Items]
Asset Derivative Fair Value	39	7,012
Liability Derivative Fair Value	4,706	1,783
Derivative Notional Amount	288,802	287,711
Foreign Exchange Forward Contracts [Member] \| Not Designated as Hedging Instruments [Member] \| Underwriting Portfolio [Member]
Derivative Fair Values on Consolidated Balance Sheet [Line Items]
Asset Derivative Fair Value	6,107	14,644
Liability Derivative Fair Value	1,552	252
Derivative Notional Amount	$ 462,712	$ 955,728

Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

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- Definition

Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

+ References+ Details