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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
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