LONG-TERM DEBT (Details) (USD $)	3 Months Ended		1 Months Ended	3 Months Ended			1 Months Ended	3 Months Ended			1 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jul. 31, 2007 Credit Agreement	Jun. 30, 2011 Credit Agreement	Jun. 30, 2010 Credit Agreement	Mar. 31, 2011 Credit Agreement	Jun. 30, 2009 4.375% convertible senior notes due 2014 ("Convertible Notes")	Jun. 30, 2011 4.375% convertible senior notes due 2014 ("Convertible Notes")	Jun. 30, 2010 4.375% convertible senior notes due 2014 ("Convertible Notes")	Mar. 31, 2011 4.375% convertible senior notes due 2014 ("Convertible Notes")	Jun. 30, 2009 4.375% convertible senior notes due 2014 ("Convertible Notes") Conversion Terms at Holder's Option	Jun. 30, 2009 4.375% convertible senior notes due 2014 ("Convertible Notes") Redemption Terms at Company Option	Jun. 30, 2009 4.375% convertible senior notes due 2014 ("Convertible Notes") Conversion Terms Upon Occurrence of Certain Fundamental Company Changes	Jun. 30, 2009 4.375% convertible senior notes due 2014 ("Convertible Notes") Conversion Terms, Event of Default
Credit Agreement
Maximum borrowing capacity			$ 140,000,000
Interest rate terms			Revolving loans under the Credit Agreement bear interest at our election of (a) 2.00% to 2.50% above a certain base rate with a minimum 6.00% base rate (8.00% at June 30, 2011), or (b) 3.25% to 3.75% above the LIBOR Rate with a minimum 4.00% LIBOR Rate (7.25% at June 30, 2011), with the margin rate subject to the achievement of certain average liquidity levels.
Payment of monthly fee on unused available balance, low end of range (as a percent)			0.25%
Payment of monthly fee on unused available balance, high end of range (as a percent)			0.75%
Credit Agreement Availability
Available borrowings				121,557,000		115,503,000
Outstanding letters of credit				1,664,000		1,664,000
Interest expense and fees				436,000	456,000
Convertible Notes
Aggregate principal amount							138,000,000
Interest rate on convertible notes (as a percent)							4.375%
Amount pertaining to exercise of over-allotment of debt by underwriters							18,000,000
Initial conversion rate of common stock per $1 of principal amount of Convertible Notes (in shares)							93.6768
Principal amount used for debt instrument conversion ratio							1
Initial conversion price of convertible notes into common stock (in dollars per share)							$ 10.675	$ 10.675
Number of shares to be converted into common stock (in shares)							12,927,000
Minimum number of trading days triggering conversion or redemption feature (in days)								20			20	20
The maximum period of consecutive trading days that the entity's common stock closing price to conversion price must exceed a specified percentage of conversion price to trigger conversion or redemption feature of notes (in days)								30			30	30
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%	150.00%
Minimum consecutive days in the measurement period the closing sales price of common stock must exceed a specified percentage of conversion price to trigger conversion feature of note (in days)											5
The maximum period 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 (in days)											10
Ratio of closing share price to conversion price as a condition for conversion of Convertible Notes, minimum (as a percent)											98.00%
Redemption price as percentage of principal amount of notes plus accrued and unpaid interest (as a percent)							100.00%					100.00%	100.00%	100.00%
Minimum percentage of aggregate principal amount held by bondholders to declare notes due and payable (as a percent)							100.00%							25.00%
In event of default arising out of certain bankruptcy events, the percentage of principal amount due and payable (as a percent)							100.00%
Adjustment to additional paid-in capital for options to purchase common stock							43,600,000
Strike price of warrants (in dollars per share)	$ 14.945	$ 14.945
Number of shares of common stock that will be settled against warrants (in shares)							12,927,000
Total proceeds from warrants credited to additional paid-in capital							26,300,000
Banking, legal and accounting fees related to issuance of convertible notes							3,410,000
Additional information related to convertible notes
Principal amount of Convertible Notes								138,000,000		138,000,000
Unamortized discount of the liability component								28,764,000		30,761,000
Net carrying amount of Convertible Notes								109,236,000		107,239,000
Carrying amount of debt issuance costs								1,990,000		2,161,000
Components of interest expense
Cash interest expense (coupon interest expense)								1,509,000	1,476,000
Amortization of discount on Convertible Notes	1,997,000	1,755,000						1,997,000	1,755,000
Amortization of debt issuance costs	313,000	313,000						171,000	171,000
Total interest expense related to Convertible Notes								$ 3,677,000	$ 3,402,000