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DERIVATIVE INSTRUMENTS (DETAILS) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Derivative Fair Values on Consolidated Balance Sheet [Line Items]
Asset Derivative Fair Value	$ 38,175	$ 6,641
Liability Derivative Fair Value	2,035	14,986
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	16,519	0
Liability Derivative Fair Value	0	13,748
Derivative Notional Amount	540,176	612,845
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	7,012	2,182
Liability Derivative Fair Value	1,783	746
Derivative Notional Amount	287,711	154,990
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	14,644	4,459
Liability Derivative Fair Value	252	492
Derivative Notional Amount	$ 955,728	$ 110,564

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