FINANCING ARRANGEMENTS: (Details) (USD $)	3 Months Ended			3 Months Ended					1 Months Ended					3 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Jun. 30, 2014	Sep. 30, 2014 Convertible senior notes	Sep. 30, 2013 Convertible senior notes	Jun. 30, 2014 Convertible senior notes	Nov. 30, 2013 Convertible senior notes	Jul. 31, 2009 Convertible senior notes	Nov. 30, 2013 Senior term notes	Sep. 30, 2014 Senior term notes	Jun. 30, 2014 Senior term notes	Sep. 30, 2014 Revolving credit facility	Jun. 30, 2014 Revolving credit facility	Sep. 30, 2014 Equipment and leasehold notes payable	Jun. 30, 2014 Equipment and leasehold notes payable
Long-term debt
Net carrying amount of long-term debt	$ 120,014,000		$ 293,503,000	$ 0		$ 172,246,000				$ 120,000,000	$ 120,000,000	$ 0	$ 0	$ 14,000	$ 1,257,000
Less current portion	(14,000)		(173,501,000)
Long-term debt and capital lease obligations	120,000,000		120,002,000
Interest rate percentage				5.00%			5.75%	5.00%	5.75%	5.75%
Interest rate percentage, minimum														4.90%
Interest rate percentage, maximum														8.75%
Convertible Senior Debt
Debt Instrument, Face Amount								172,500,000	120,000,000
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities	173,740,000	1,706,000		172,500,000
Interest expense related to contractual interest coupon				400,000	2,200,000
Interest cost related to amortization of the discount				300,000	1,400,000
Senior Term Notes
Long-term Debt, Gross									118,100,000
Revolving Credit Facility
Line of Credit Facility, Amount Outstanding												0	0
Outstanding standby letters of credit												2,000,000	2,200,000
Revolving credit facility remaining borrowing capacity												$ 398,000,000	$ 397,800,000