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Basic and Diluted Earnings Per Share (EPS) Data Basic and Diluted Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2012
Earnings Per Share, Basic and Diluted [Abstract]  
Schedule of Calculation of Numerator and Denominator in Earnings Per Share [Table Text Block]
The following table reconciles the denominator used to compute basic EPS to the denominator used to compute diluted EPS for the three and six months ended June 30, 2012 and June 30, 2011:
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2012
 
2011
 
2012
 
2011
 
 
 
 
 
 
 
 
Numerator:
 
 
 
 
 
 
 
Net income attributable to CDI
$
4,952

 
$
11,982

 
$
8,775

 
$
12,676

Denominator:
 
 
 
 
 
 
 
Basic weighted-average shares
19,285

 
19,145

 
19,243

 
19,114

Dilutive effect of stock-based awards
422

 
203

 
397

 
224

Diluted weighted-average shares
19,707

 
19,348

 
19,640

 
19,338

Earnings per common share:
 
 
 
 
 
 
 
Basic
$
0.26

 
$
0.62

 
$
0.46

 
$
0.66

Diluted
$
0.25

 
$
0.62

 
$
0.45

 
$
0.66


There were 309 thousand shares and 707 thousand shares excluded from the computation of EPS for the three months ended June 30, 2012 and June 30, 2011, respectively, because their inclusion would have been anti-dilutive. There were 495 thousand shares and 725 thousand shares excluded from the computation of EPS for the six months ended June 30, 2012 and June 30, 2011, respectively, because their inclusion would have been anti-dilutive.