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Comprehensive Income (Tables)
12 Months Ended
Dec. 31, 2011
Comprehensive Income [Abstract]  
Components of comprehensive income
The table below presents the components of comprehensive income for the past three years (in thousands):

  
 
2011
   
2010
   
2009
 
Net income
$
71,993
 
$
57,638
 
$
19,202
 
Foreign currency translation adjustments
 
(609
)
 
(2,170
)
 
2,434
 
Unrealized gains on interest rate swaps (1)
 
1,777
   
996
   
2,178
 
Comprehensive income
$
73,161
 
$
56,464
 
$
23,814
 

(1)  
Amounts are shown net of tax.

Components of and changes in accumulated other comprehensive income (loss)
The table below presents the components of and changes in Accumulated other comprehensive income (loss) (in thousands):

  
 
Foreign Currency Translation
   
Unrealized Gains (Losses) on Interest Rate Swaps (1)
   
Total
 
Balance at December 31, 2009
$
5,255
 
$
(3,029
)
$
2,226
 
Net change
 
(2,170
)
 
996
   
(1,174
)
Balance at December 31, 2010
 
3,085
   
(2,033
)
 
1,052
 
Net change
 
(609
)
 
1,777
   
1,168
 
Balance at December 31, 2011
$
2,476
 
$
(256
)
$
2,220
 

(1)  
Amounts are shown net of tax.