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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 |
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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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 + Details
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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid more than one year (or one operating cycle, if longer) after the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6455314&loc=d3e45023-112735 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of minimum lease payments maturing in the next fiscal year following the latest fiscal year for capital leases. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 + Details
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- Definition Amount of minimum lease payments for capital leases net of executory costs, which include amounts paid by the lessee to the lessor for insurance, maintenance and taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 + Details
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- Definition Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13,16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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