DERIVATIVE FINANCIAL INSTRUMENTS (Details 2) (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012	Dec. 31, 2011 instrument
Derivative
Number of hedged certificates of deposit			4
Amount of each individual certificate of deposit hedged by a derivative			$ 50,000,000
Receive-fixed, Pay-variable Interest Rate Swaps
Derivative
Number of instruments entered into during the period			4
Notional amount of each individual derivative entered into during the period			50,000,000
Net gain (loss) recognized in interest expense related to hedge ineffectiveness	1,100,000	1,900,000
Net reduction to interest expense related to net settlements of derivatives	1,100,000	2,600,000
Equity swap agreements
Derivative
Term of contract		5 years
Foreign exchange options
Derivative
Term of contract		5 years
Interest rate swaps
Derivative
Notional amount of derivatives called by the counterparties	$ 100,000,000	$ 100,000,000
The number of derivatives called by the counterparties	2