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Earnings per Share (Tables)
9 Months Ended
Sep. 30, 2011
Earnings Per Share Reconciliation [Abstract] 
Schedule of Calculation of Numerator and Denominator in Earnings Per Share [Table Text Block]
Earnings per share for three and nine months ended September 30, 2011 and 2010 are calculated as follows:
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2011
 
2010
 
2011
 
2010
Numerator:
 
 
 
 
 
 
 
Net income
$
16,803

 
$
8,273

 
$
72,450

 
$
11,871

Denominator:
 
 
 
 
 
 
 
Shares used in computing basic earnings per share
42,511

 
41,774

 
42,334

 
40,939

Dilutive common stock equivalents
284

 
460

 
381

 
578

Shares used in computing diluted earnings per share
42,795

 
42,234

 
42,715

 
41,517

Basic earnings per share
$
0.40

 
$
0.20

 
$
1.71

 
$
0.29

Diluted earnings per share
$
0.39

 
$
0.20

 
$
1.70

 
$
0.29