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LONG-TERM BORROWINGS (Details) (USD $) | 1 Months Ended |  |  | 1 Months Ended |  | 1 Months Ended | 3 Months Ended |  | 3 Months Ended |  | 1 Months Ended | 3 Months Ended |  |  | 1 Months Ended | 3 Months Ended |  | 1 Months Ended | 3 Months Ended |
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Mar. 31, 2011 | Feb. 02, 2014 | Nov. 03, 2013 | Dec. 31, 2013 Newly Amended Credit Facility [Member] | Feb. 02, 2014 Newly Amended Credit Facility [Member] | Mar. 31, 2011 3.25% convertible senior notes due on April 1, 2016 [Member] | Feb. 02, 2014 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] | Feb. 02, 2014 2.77% capital lease obligation payable through July 2018 [Member] | Nov. 03, 2013 2.77% capital lease obligation payable through July 2018 [Member] | Dec. 31, 2013 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] | Feb. 02, 2014 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. 30, 2011 5.50% convertible senior notes due on October 1, 2014 [Member] | Dec. 31, 2013 Term Loan [Member] | Feb. 02, 2014 Term Loan [Member] | Nov. 03, 2013 Term Loan [Member] | Apr. 30, 2011 3.09% capital lease obligation payable through March 2016 [Member] | Feb. 02, 2014 3.09% capital lease obligation payable through March 2016 [Member] | Nov. 03, 2013 3.09% capital lease obligation payable through March 2016 [Member]
Long-term borrowings [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt and capital lease obligations |  | $ 170,467,000 | $ 194,021,000 |  |  |  | $ 115,000,000 | $ 115,000,000 | $ 23,826,000 | $ 25,065,000 |  |  | $ 22,054,000 | $ 22,054,000 |  |  | $ 0 | $ 21,250,000 |  | $ 9,587,000 | $ 10,652,000
Less current portion |  | 9,387,000 | 11,818,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt and capital lease obligations non current |  | 161,080,000 | 182,203,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate percentage (in hundredths) |  |  |  |  |  |  | 3.25% |  | 2.77% |  |  |  | 5.50% |  |  |  |  |  |  | 3.09% |
Maturity date of debt |  |  |  | Dec. 31, 2018 |  |  | Apr. 01, 2016 |  | Jul. 31, 2018 |  |  |  | Oct. 01, 2014 |  |  |  | Mar. 31, 2017 |  |  | Mar. 30, 2016 |
Original face amount of debt |  |  |  |  |  |  |  |  | 26,400,000 |  |  | 57,500,000 |  |  |  |  | 25,000,000 |  | 21,200,000 |  |
Variable interest rate (in hundredths) |  |  |  |  | 1.90% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Periodic payments |  |  |  |  |  |  |  |  | 500,000 |  |  |  |  |  |  |  |  |  | 400,000 |  |
Frequency of periodic payment |  |  |  |  |  |  |  |  | per month |  |  |  |  |  |  |  |  |  | per month |  |
Repayment of term loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 21,300,000 |  |  |  |  |
Short-term debt, refinanced amount |  |  |  |  |  |  |  |  |  |  | 22,100,000 |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | 75,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining borrowing capacity under credit facility |  |  |  | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment period of debt |  |  |  | 5 years |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  | 5 years |  |
Amount outstanding under credit facility |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 each note converted |  |  |  |  |  | 1,000 |  |  |  |  |  | 1,000 |  |  |  |  |  |  |  |  |
Number of shares each note is convertible to (in shares) |  |  |  |  |  | 96 |  |  |  |  |  | 197 |  |  |  |  |  |  |  |  |
Face amount of debt repurchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35,400,000 |  |  |  |  |  |
Amount payable through the end of lease term |  |  |  |  |  |  |  |  | 25,400,000 |  |  |  |  |  |  |  |  |  |  | 9,900,000 |
Interest included in lease payments |  |  |  |  |  |  |  |  | $ 1,600,000 |  |  |  |  |  |  |  |  |  |  | $ 300,000 |

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