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DEBT (Tables)
3 Months Ended
Jun. 30, 2014
DEBT  
Information related to availability on Credit Agreement

  June 30, 2014   March 31, 2014  

Available borrowings

  $ 57,316   $ 63,630  

Outstanding letters of credit

    1,664     1,664  
4.375% Convertible Notes Due 2014
 
DEBT  
Schedule of components of interest expense related to convertible notes
 
  Three Months
Ended June 30,
 
 
  2013  

Cash interest expense (coupon interest expense)

  $ 1,509  

Non-cash amortization of discount on 4.375% Convertible Notes

    2,587  

Amortization of debt issuance costs

    171  
       

Total interest expense related to 4.375% Convertible Notes

  $ 4,267  
       
       
1.75% Convertible Notes Due 2016
 
DEBT  
Schedule of additional information related to convertible notes
 
  June 30, 2014   March 31, 2014  

Additional paid-in capital

  $ 51,180   $ 51,180  
           

Principal amount of 1.75% Convertible Notes

  $ 250,000   $ 250,000  

Unamortized discount of the liability component

    27,431     30,025  
           

Net carrying amount of 1.75% Convertible Notes

  $ 222,569   $ 219,975  
           

Carrying amount of debt issuance costs

  $ 2,448   $ 2,716  
           
Schedule of components of interest expense related to convertible notes
 
  Three Months
Ended June 30,
 
 
  2014   2013  

Cash interest expense (coupon interest expense)

  $ 1,094   $ 1,094  

Non-cash amortization of discount on 1.75% Convertible Notes

    2,594     2,427  

Amortization of debt issuance costs

    268     281  
           

Total interest expense related to 1.75% Convertible Notes

  $ 3,956   $ 3,802  
           
           
1.00% Convertible Notes Due 2018
 
DEBT  
Schedule of additional information related to convertible notes
 
  June 30, 2014   March 31, 2014  

Additional paid-in capital

  $ 35,784   $ 35,784  
           

Principal amount of 1.00% Convertible Notes

  $ 287,500   $ 287,500  

Unamortized discount of the liability component

    50,661     53,444  
           

Net carrying amount of 1.00% Convertible Notes

  $ 236,839   $ 234,056  
           

Carrying amount of debt issuance costs

  $ 1,712   $ 1,831  
           
Schedule of components of interest expense related to convertible notes
 
  Three Months
Ended June 30,
 
 
  2014   2013  

Cash interest expense (coupon interest expense)

  $ 719   $ 90  

Non-cash amortization of discount on 1.00% Convertible Notes

    2,783     332  

Amortization of debt issuance costs

    119     12  
           

Total interest expense related to 1.00% Convertible Notes

  $ 3,621   $ 434