DERIVATIVE FINANCIAL INSTRUMENTS (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011		Dec. 31, 2010
Designated as Hedging Instrument
Fair Values of Derivative Instruments
Notional amount	$ 200,000
Derivative assets	998	[1]
Derivative liabilities	639	[1]
Designated as Hedging Instrument | Interest rate swaps
Fair Values of Derivative Instruments
Notional amount	200,000
Derivative assets	998	[1]
Derivative liabilities	639	[1]
Not Designated as Hedging Instrument
Fair Values of Derivative Instruments
Notional amount	803,814		205,221
Derivative assets	24,980	[1]	6,523	[1]
Derivative liabilities	23,525	[1]	4,498	[1]
Not Designated as Hedging Instrument | Equity swap agreements
Fair Values of Derivative Instruments
Notional amount	22,709		22,884
Derivative assets	202	[1]	206	[1]
Derivative liabilities	204	[1]	210	[1]
Not Designated as Hedging Instrument | Foreign exchange options
Fair Values of Derivative Instruments
Notional amount	85,614		85,614
Derivative assets	3,899	[1]	5,084	[1]
Derivative liabilities	2,430	[1]	3,239	[1]
Not Designated as Hedging Instrument | Interest rate swaps
Fair Values of Derivative Instruments
Notional amount	485,196		4,098
Derivative assets	19,476	[1]	13	[1]
Derivative liabilities	19,924	[1]	14	[1]
Not Designated as Hedging Instrument | Short-term Foreign Exchange
Fair Values of Derivative Instruments
Notional amount	210,295		92,625
Derivative assets	1,403	[1]	1,220	[1]
Derivative liabilities	$ 967	[1]	$ 1,035	[1]

[1] Derivative assets include the estimated gain to settle a derivative contract plus net interest receivable. Derivative liabilities include the estimated loss to settle a derivative contract.