RELINQUISHMENT AGREEMENT (Details) (USD $)	3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2013	Sep. 30, 1998
RELINQUISHMENT AGREEMENT [Abstract]
Term of relinquishment agreement	15 years
Period following the end of the first three-month period after the relinquishment date upon which senior relinquishment payments start	25 days
Period following the end of the first six-month period after the relinquishment date upon which junior relinquishment payments start	25 days
Relinquishment payment rate as a percent of revenues	2.50%
Relinquishment liability	$ 68,300,000		$ 74,400,000	$ 549,100,000
Relinquishment Payments [Abstract]
Principal	6,034,000	5,622,000
Accretion of discount	621,000	1,031,000
Total relinquishment payments	6,600,000	6,600,000
Accrued relinquishment payments	$ 18,600,000		$ 13,300,000