FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Sep. 30, 2012
FAIR VALUE OF FINANCIAL INSTRUMENTS [Abstract]
Other long-term investments, Supplemental Employee Retirement Plan (SERP)		$ 1,082
Corresponding SERP liability		1,082
Number of tax exempt municipal debt securities		2
Auction rate securities (ARS) par value		8,225
Number of impaired auction rate securities (ARS)		1
Fair value of impaired security		3,041
Par value of impaired security		3,275
Impairment amount of impaired security		234
Monetized par value of impaired security	$ 50