Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

DEBT (Details) (USD $)	1 Months Ended	3 Months Ended		1 Months Ended	3 Months Ended			1 Months Ended	3 Months Ended	1 Months Ended	3 Months Ended	1 Months Ended		3 Months Ended	1 Months Ended			1 Months Ended	3 Months Ended				1 Months Ended					0 Months Ended		3 Months Ended			0 Months Ended							1 Months Ended	3 Months Ended		1 Months Ended		0 Months Ended	3 Months Ended
DEBT (Details) (USD $)	Aug. 31, 2013	Jun. 30, 2014	Jun. 30, 2013	Oct. 31, 2011 Credit Agreement	Jun. 30, 2014 Credit Agreement	Jun. 30, 2013 Credit Agreement	Mar. 31, 2014 Credit Agreement	Oct. 31, 2011 Credit Agreement Minimum	Jun. 30, 2014 Credit Agreement Minimum	Oct. 31, 2011 Credit Agreement Maximum	Jun. 30, 2014 Credit Agreement Base rate	Oct. 31, 2011 Credit Agreement Base rate Minimum	Oct. 31, 2011 Credit Agreement Base rate Maximum	Jun. 30, 2014 Credit Agreement LIBOR	Oct. 31, 2011 Credit Agreement LIBOR Minimum	Oct. 31, 2011 Credit Agreement LIBOR Maximum	Jun. 30, 2014 Letter of Credit	Nov. 30, 2011 1.75% Convertible Notes Due 2016	Jun. 30, 2014 1.75% Convertible Notes Due 2016	Jun. 30, 2013 1.75% Convertible Notes Due 2016	Mar. 31, 2014 1.75% Convertible Notes Due 2016	Nov. 16, 2011 1.75% Convertible Notes Due 2016	Nov. 30, 2011 1.75% Convertible Notes Due 2016 Conversion Terms at Holder's Option	Nov. 30, 2011 1.75% Convertible Notes Due 2016 Conversion Terms at Holder's Option Minimum D	Nov. 30, 2011 1.75% Convertible Notes Due 2016 Conversion Terms at Holder's Option Maximum D	Nov. 30, 2011 1.75% Convertible Notes Due 2016 Conversion Terms upon Occurrence of Certain Fundamental Company Changes	Nov. 30, 2011 1.75% Convertible Notes Due 2016 Conversion Terms, Event of Default	Jul. 17, 2013 1.00% Convertible Notes Due 2018	Jun. 18, 2013 1.00% Convertible Notes Due 2018	Jun. 30, 2014 1.00% Convertible Notes Due 2018	Jun. 30, 2013 1.00% Convertible Notes Due 2018	Mar. 31, 2014 1.00% Convertible Notes Due 2018	Jun. 18, 2013 1.00% Convertible Notes Due 2018 Maximum	Jun. 18, 2013 1.00% Convertible Notes Due 2018 Conversion Terms at Holder's Option	Jun. 18, 2013 1.00% Convertible Notes Due 2018 Conversion Terms at Holder's Option Minimum D	Jun. 18, 2013 1.00% Convertible Notes Due 2018 Conversion Terms at Holder's Option Maximum D	Jun. 18, 2013 1.00% Convertible Notes Due 2018 Conversion Terms upon Occurrence of Certain Fundamental Company Changes	Jun. 18, 2013 1.00% Convertible Notes Due 2018 Conversion Terms, Event of Default	Aug. 29, 2013 4.375% Convertible Notes Due 2014	Jun. 30, 2009 4.375% Convertible Notes Due 2014	Jun. 30, 2014 4.375% Convertible Notes Due 2014	Jun. 12, 2013 4.375% Convertible Notes Due 2014	Jun. 30, 2009 4.375% Convertible Notes Due 2014 4.375% Convertible Note hedge options	Jun. 30, 2009 4.375% Convertible Notes Due 2014 4.375% Convertible Note hedge warrants	Aug. 29, 2013 4.375% Convertible Notes Due 2014 Maximum	Aug. 29, 2013 4.375% Convertible Notes Due 2014 Conversion Terms at Holder's Option
Credit Agreement
Maximum borrowing capacity				$ 100,000,000													$ 25,000,000
Amount of additional borrowings by which maximum borrowing capacity may be increased				40,000,000
Interest rate, variable rate basis											Base Rate			LIBOR
Interest rate added to base rate (as a percent)												1.50%	2.00%		2.50%	3.00%
Interest rate at end of period (as a percent)											4.75%			2.66%
Monthly fee on unused available balance (as a percent)								0.375%		0.50%
Outstanding borrowings					0		0
Credit Agreement Availability
Available borrowings					57,316,000		63,630,000
Outstanding letters of credit					1,664,000		1,664,000
Interest expense and fees					159,000	159,000
Interest coverage ratio									1
Trailing period for measurement of interest coverage ratio					12 months
Maximum liquidity level triggering the requirement to maintain an interest coverage ratio of one to one					30,000,000
Convertible Notes
Aggregate principal amount																						250,000,000							250,000,000											138,000,000
Interest rate on convertible notes (as a percent)																			1.75%		1.75%	1.75%							1.00%	1.00%										4.375%	4.375%
Percentage of par value at which debt was issued																													98.50%
Period of overallotment option to purchase additional amount of debt granted to underwriters																													30 days
Additional amount of debt for purchase of which overallotment option is granted to underwriters																																	37,500,000
Amount pertaining to exercise of over-allotment of debt by underwriters																												37,500,000												18,000,000
Proceeds from issuance of debt			246,250,000																									283,188,000	246,250,000
Initial conversion rate of common stock per $1000 of principal amount of Convertible Notes (in shares)																		52.3745											46.4727
Principal amount used for debt instrument conversion ratio																						1,000							1,000
Initial conversion price of convertible notes into common stock (in dollars per share)																						$ 19.093							$ 21.52
Number of shares to be converted into common stock																		13,094,000											13,361,000
Number of trading days triggering conversion of redemption feature																								20 days	30 days										20 days	30 days
Target ratio of closing share price to conversion price as a condition for conversion or redemption of Convertible Notes (as a percent)																							130.00%											130.00%
Number of trading days in the measurement period that the entity's common stock closing price to conversion price must exceed a specified percentage of conversion price to trigger conversion feature of notes																								5	10										5	10
Ratio of closing share price to conversion price as a condition for conversion of Convertible Notes (as a percent)																							98.00%											98.00%
Redemption price as percentage of principal amount of notes plus accrued and unpaid interest																										100.00%											100.00%
Minimum percentage of aggregate principal amount held by bondholders to declare notes due and payable																											25.00%											25.00%
In event of default arising out of certain bankruptcy events, the percentage of principal amount due and payable																											100.00%											100.00%
Derivative nonmonetary notional amount (in shares)																																											12,927,000
Investment options exercise price (in dollars per share)																																											$ 10.675
Total cost charged to additional paid-in capital for options to purchase common stock																																											43,600,000
Investment warrants exercise price (in dollars per share)																																												$ 14.945
Number of shares of common stock that will be settled against warrants																																												12,927,000
Total proceeds from warrants credited to additional paid-in capital																																												26,300,000
Proceeds from unwinding of convertible note hedge	84,429,000
Payments to warrant holders	55,651,000
Redemption price of debt instrument for each $1 principal amount																																										1
Principal amount used for ratio of debt instrument redemption price																																										1
Cash payable for convertible notes surrendered for conversion in connection with the redemption on a combination settlement basis																																							7,000						166,000,000	165,992,000
Amount of debt converted																																														137,993,000
Number of shares issued upon conversion																																														3,217,000
Debt redeemed																																							7,000
Additional information related to convertible notes
Additional paid-in capital																			51,180,000		51,180,000									35,784,000		35,784,000
Principal amount of Convertible Notes																			250,000,000		250,000,000									287,500,000		287,500,000
Unamortized discount of the liability component																			27,431,000		30,025,000									50,661,000		53,444,000
Net carrying amount of Convertible Notes																			222,569,000		219,975,000									236,839,000		234,056,000
Carrying amount of debt issuance costs																			2,448,000		2,716,000									1,712,000		1,831,000
Components of interest expense
Cash interest expense (coupon interest expense)																			1,094,000	1,094,000										719,000	90,000										1,509,000
Non-cash amortization of discount on Convertible Notes		5,377,000	5,346,000																2,594,000	2,427,000										2,783,000	332,000										2,587,000
Amortization of debt issuance costs		431,000	497,000																268,000	281,000										119,000	12,000										171,000
Total interest expense related to Convertible Notes																			$ 3,956,000	$ 3,802,000										$ 3,621,000	$ 434,000										$ 4,267,000