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Earnings per Share (Tables)
 9 Months Ended
Sep. 30, 2012
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, 2012 and 2011 are calculated as follows:
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2012
 
2011
 
2012
 
2011
Numerator:
 
 
 
 
 
 
 
Net income
$
11,051

 
$
18,287

 
$
26,355

 
$
79,113

Denominator:
 
 
 
 
 
 
 
Shares used in computing basic earnings per share
42,969

 
42,511

 
42,852

 
42,334

Dilutive common stock equivalents
222

 
284

 
140

 
381

Shares used in computing diluted earnings per share
43,191

 
42,795

 
42,992

 
42,715

Basic earnings per share
$
0.26

 
$
0.43

 
$
0.62

 
$
1.87

Diluted earnings per share
$
0.26

 
$
0.43

 
$
0.61

 
$
1.85