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Comprehensive Income
9 Months Ended
Sep. 30, 2011
Comprehensive Income [Abstract] 
Comprehensive Income
(9)  Comprehensive Income

Comprehensive income consisted of the following (in thousands):

   
Quarters Ended
  
Nine Months Ended
 
   
September 30,
  
September 30,
 
   
2011
  
2010
  
2011
  
2010
 
Net income
 $16,473  $10,629  $50,024  $26,242 
Unrealized gain (loss) on investments
     250   1,100   (250)
Defined benefit plans, net of tax
  (958)  412   (1,085)  131 
Total comprehensive income
 $15,515  $11,291  $50,039  $26,123