NOTES PAYABLE (Detail Textuals) (Notes Payable, USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Oct. 31, 2008
Notes Payable
Debt Instrument [Line Items]
Margin loan agreement with financial institution				$ 2.9
Debt Instrument Maximum Borrowed Amount				1.7
Amount collateralized under auction rate securities	2.1
Amount outstanding under margin loan agreement facility	1.7	1.7
Interest expense	$ 26	$ 25	$ 274