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Convertible Debentures and Credit Arrangements (Tables)
12 Months Ended
Dec. 31, 2013
Debt Disclosure [Abstract]  
Convertible Senior Debentures
The carrying values of the Company’s convertible senior debentures were as follows: 
 
As of December 31,
 
2013
 
2012
 
(In thousands)
Convertible senior debentures due 2018
$
49,478

 
$
48,483

Convertible senior debentures due 2024
441

 
441

Convertible senior debentures due 2014
29

 
67

 
49,948

 
48,991

Less: current portion
(470
)
 

Convertible senior debentures — non-current
$
49,478

 
$
48,991