FINANCING ARRANGEMENTS: (Details) (USD $)	6 Months Ended			6 Months Ended					1 Months Ended					6 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2013	Dec. 31, 2013 Convertible senior notes	Dec. 31, 2012 Convertible senior notes	Nov. 30, 2013 Convertible senior notes	Jun. 30, 2013 Convertible senior notes	Jul. 31, 2009 Convertible senior notes	Nov. 30, 2013 Senior term notes	Dec. 31, 2013 Senior term notes	Jun. 30, 2013 Senior term notes	Dec. 31, 2013 Revolving credit facility	Jun. 30, 2013 Revolving credit facility	Dec. 31, 2013 Equipment and leasehold notes payable	Jun. 30, 2013 Equipment and leasehold notes payable
Long-term debt
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%
Net carrying amount of long-term debt	$ 294,153,000		$ 174,770,000	$ 169,289,000			$ 166,454,000			$ 120,000,000	$ 0	$ 0	$ 0	$ 4,864,000	$ 8,316,000
Less current portion	(174,143,000)		(173,515,000)
Long-term debt and capital lease obligations	120,010,000		1,255,000
Convertible Senior Debt
Debt Instrument, Face Amount								172,500,000.0	120,000,000
Long-term debt conversion ratio				0.0656019
Long-term debt conversion price (in dollars per share)				$ 15.24
Interest expense related to contractual interest coupon				4,300,000	4,300,000
Interest cost related to amortization of the discount				2,800,000	2,600,000
Senior Term Notes
Long-term Debt, Gross	118,058,000	0							118,100,000
Debt Instrument, Fee Amount									1,900,000
Revolving Credit Facility
Line of Credit Facility, Amount Outstanding												0	0
Outstanding standby letters of credit												2,200,000	2,200,000
Revolving credit facility remaining borrowing capacity												$ 397,800,000	$ 397,800,000