LONG-TERM BORROWINGS (Details) (USD $)	1 Months Ended	12 Months Ended				12 Months Ended		1 Months Ended		12 Months Ended		12 Months Ended		1 Months Ended				12 Months Ended			1 Months Ended		12 Months Ended		12 Months Ended			12 Months Ended
	Mar. 31, 2011	Nov. 03, 2013	Oct. 28, 2012	Oct. 30, 2011	Mar. 31, 2011 Credit Facility [Member]	Nov. 03, 2013 Amended Credit Facility [Member]	Mar. 31, 2011 Amended Credit Facility [Member]	Dec. 31, 2013 Newly Amended Credit Facility [Member] Subsequent Event [Member]	Mar. 31, 2011 3.25% convertible senior notes due on April 1, 2016 [Member]	Nov. 03, 2013 3.25% convertible senior notes due on April 1, 2016 [Member]	Oct. 28, 2012 3.25% convertible senior notes due on April 1, 2016 [Member]	Nov. 03, 2013 Term Loan [Member]	Oct. 28, 2012 Term Loan [Member]	Dec. 31, 2013 Term Loan [Member] Subsequent Event [Member]	Jun. 30, 2011 5.50% convertible senior notes due on October 1, 2014 [Member]	Mar. 31, 2011 5.50% convertible senior notes due on October 1, 2014 [Member]	Sep. 30, 2009 5.50% convertible senior notes due on October 1, 2014 [Member]	Nov. 03, 2013 5.50% convertible senior notes due on October 1, 2014 [Member]	Oct. 28, 2012 5.50% convertible senior notes due on October 1, 2014 [Member]	Oct. 30, 2011 5.50% convertible senior notes due on October 1, 2014 [Member]	Dec. 31, 2013 5.50% convertible senior notes due on October 1, 2014 [Member] Subsequent Event [Member]	Apr. 30, 2011 3.09% capital lease obligation payable through March 2016 [Member]	Nov. 03, 2013 3.09% capital lease obligation payable through March 2016 [Member]	Oct. 28, 2012 3.09% capital lease obligation payable through March 2016 [Member]	Nov. 03, 2013 4.75% financing loan with customer [Member]	Oct. 28, 2012 4.75% financing loan with customer [Member]	Jan. 31, 2010 4.75% financing loan with customer [Member]	Nov. 03, 2013 2.77% Capital lease obligations payable through July 2018 [Member]	Oct. 28, 2012 2.77% Capital lease obligations payable through July 2018 [Member]
Long-term borrowings [Abstract]
Long-term debt and capital lease obligations		$ 194,021,000	$ 176,737,000							$ 115,000,000	$ 115,000,000	$ 21,250,000	$ 23,750,000					$ 22,054,000	$ 22,054,000				$ 10,652,000	$ 15,175,000	$ 0	$ 758,000		$ 25,065,000	$ 0
Less current portion		11,818,000	7,781,000
Long-term debt and capital lease obligations non current		182,203,000	168,956,000
Interest rate percentage (in hundredths)										3.25%								5.50%					3.09%		4.75%			2.77%
Variable interest rate (in hundredths)												2.69%
Long-term borrowings maturing in 2014		2,500,000
Long-term borrowings maturing in 2015		24,554,000
Long-term borrowings maturing in 2016		117,500,000
Long-term borrowings maturing in 2017		13,750,000
Minimum lease payments under the Company's capital lease obligations [Abstract]
2014		10,218,000
2015		10,218,000
2016		7,076,000
2017		6,108,000
2018		4,228,000
Future minimum payments due		37,848,000
Less interest		2,131,000																					400,000					1,700,000
Net minimum lease payments under capital leases		35,717,000
Less current portion of net minimum lease payments		9,318,000
Long-term portion of minimum lease payments		26,399,000
Maturity date of debt						Apr. 30, 2015		Dec. 31, 2018		Apr. 01, 2016		Mar. 01, 2017						Oct. 01, 2014					Mar. 30, 2016		Nov. 03, 2013			Jul. 31, 2018
Original face amount of debt												25,000,000					57,500,000					21,200,000					3,700,000	26,400,000
Periodic payments																						400,000						500,000
Frequency of periodic payment																						per month						per month
Repayment of term loan														21,300,000
Maximum borrowing capacity					65,000,000		30,000,000	75,000,000
Short-term debt, refinanced amount																					22,100,000
Remaining borrowing capacity under credit facility								50,000,000
Maximum amount of financed capital assets						75,000,000
Amount of investment basket					15,000,000	25,000,000
Credit facility interest rate (in hundredths)						2.69%
Amount outstanding under credit facility								0
Face amount of each note converted									1,000								1,000
Number of shares each note is convertible to (in shares)									96								197
Conversion price per share (in dollars per share)									$ 10.37								$ 5.08
Proceeds from notes payable, net									110,700,000								54,900,000
Capital lease obligations repaid	19,800,000
Face amount of debt repurchased															5,000,000	30,400,000				35,400,000
Common stock issued to extinguish debt (in shares)															700,000	4,500,000
Common stock issued to extinguish debt															6,500,000	39,200,000
Cash paid for convertible notes acquired															3,200,000	19,700,000
Number of shares issued for each note converted (in shares)															148	148
Cash paid for each note converted															647	647
Debt extinguishment loss		0	0	(35,259,000)											(5,000,000)	(30,100,000)
Write off of deferred financing fees															300,000	1,700,000
Repayment period of debt								5 years														5 years						5 years
Amount payable through the end of lease term																							11,100,000					26,800,000
Value of product shipped for repayment of loan																									800,000	1,000,000
Interest payments		6,300,000	6,300,000	9,700,000
Deferred financing cost payments		$ 0	$ 198,000	$ 4,300,000