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Earnings per Share (Tables)
 6 Months Ended
Jun. 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 six months ended June 30, 2012 and 2011 are calculated as follows:
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2012
 
2011
 
2012
 
2011
Numerator:
 
 
 
 
 
 
 
Net income
$
10,605

 
$
12,713

 
$
15,304

 
$
60,826

Denominator:
 
 
 
 
 
 
 
Shares used in computing basic earnings per share
42,804

 
42,354

 
42,781

 
42,244

Dilutive common stock equivalents
129

 
386

 
130

 
430

Shares used in computing diluted earnings per share
42,933

 
42,740

 
42,911

 
42,674

Basic earnings per share
$
0.25

 
$
0.30

 
$
0.36

 
$
1.44

Diluted earnings per share
$
0.25

 
$
0.30

 
$
0.36

 
$
1.43