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Convertible Debentures and Credit Arrangements (Tables)
 9 Months Ended
Sep. 30, 2013
Debt Disclosure [Abstract]  
Convertible Senior Debentures
The carrying values of the Company’s convertible senior debentures were as follows:
   
September 30, 2013
 
December 31, 2012
 
(In thousands)
(Unaudited)
Convertible senior debentures due 2018
$
49,221

 
$
48,483

Convertible senior debentures due 2014
29

 
67

Convertible senior debentures due 2024
441

 
441

   
49,691

 
48,991

Less: current portion
(470
)
 
—

Convertible senior debentures – non current
$
49,221

 
$
48,991