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Comprehensive income (Tables)
9 Months Ended
Sep. 30, 2011
Comprehensive income [Abstract] 
Comprehensive Income and the Components of Other Comprehensive Income (Loss) and Related Tax Effects
Comprehensive income, and the components of other comprehensive income (loss) and related tax effects, were as follows:

   
Three Months Ended
September 30,
 
   
2011
  
2010
 
   
(In thousands)
 
Net income
 $63,974  $61,010 
Other comprehensive income:
        
Net unrealized gain (loss) on derivative instruments qualifying as hedges:
        
Net unrealized gain on derivative instruments arising during the period, net of tax of $19,481 and $2,177 in 2011 and 2010, respectively
  32,547   3,628 
Less: Reclassification adjustment for gain (loss) on derivative instruments included in net income, net of tax of $(320) and $3,209 in 2011 and 2010, respectively
  (534)  5,348 
Net unrealized gain (loss) on derivative instruments qualifying as hedges
  33,081   (1,720)
Foreign currency translation adjustment, net of tax of $(905) and $1,730 in 2011 and 2010, respectively
  (1,401)  2,679 
    31,680   959 
Comprehensive income
 $95,654  $61,969 
 
 
        
   
Nine Months Ended
September 30,
 
    2011   2010 
   
(In thousands)
 
Net income
 $152,019  $151,719 
Other comprehensive income:
        
Net unrealized gain on derivative instruments qualifying as hedges:
        
Net unrealized gain on derivative instruments arising during the period, net of tax of $19,367 and $10,351 in 2011 and 2010, respectively
  31,787   17,266 
Less: Reclassification adjustment for gain (loss) on derivative instruments included in net income, net of tax of $45 and $(1,745) in 2011 and 2010, respectively
  77   (2,797)
Net unrealized gain on derivative instruments qualifying as hedges
  31,710   20,063 
Foreign currency translation adjustment, net of tax of $(736) and $801 in 2011 and 2010, respectively
  (1,140)  1,266 
Net unrealized gains on available-for-sale investments, net of tax of $56 in 2011
  103    
    30,673   21,329 
Comprehensive income
 $182,692  $173,048