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Equity (Tables)
 12 Months Ended
Dec. 31, 2011
Equity [Abstract]  
Components of accumulated other comprehensive loss
Components of accumulated other comprehensive loss are as follows:

(In thousands)
 
2011
   
2010
 
           
Cumulative foreign currency translation adjustment
 
$
(10,396
)
 
$
(9,480
)
Unrecognized prior service cost, net of income tax
   
(13
)
   
(13
)
Unrecognized actuarial net loss, net of income tax
   
(38,667
)
   
(28,289
)
Unrecognized derivative gains, net of income tax
   
(422
)
   
566
 
Unrealized gain on marketable securities, net of income tax
   
89
     
170
 
                 
Accumulated other comprehensive loss
 
$
(49,409
)
 
$
(37,046
)