DEBT (Details) (USD $)	1 Months Ended	3 Months Ended
	Jun. 30, 2012	Sep. 30, 2012
Long-term debt disclosure
Total debt, non-current	$ 293,248,000	$ 295,440,000
Convertible notes due 2019, net
Long-term debt disclosure
Total debt, non-current	293,248,000	295,440,000
Aggregate principal amount of convertible senior notes issued	370,000,000
Interest rate on convertible senior notes (as a percent)		2.875%
Interest expense recognized		5,100,000
Revolving credit facility
Long-term debt disclosure
Maximum availability under the revolving credit facility		$ 350,000,000