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Basic and Diluted Earnings Per Share (EPS) Data Basic and Diluted Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 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 indicated periods:
 
 
Year ended December 31,
 
 
2012
 
2011
 
2010
 
 
 
 
 
 
 
Numerator:
 
 
 
 
 
 
Net income (loss) attributable to CDI
 
$
19,116

 
$
14,833

 
$
(10,858
)
Denominator:
 
 
 
 
 
 
Basic weighted-average shares
 
19,344

 
19,144

 
19,015

Dilutive effect of stock-based awards
 
401

 
212

 
—

Diluted weighted-average shares
 
19,745

 
19,356

 
19,015

Earnings (loss) per common share:
 
 
 
 
 
 
Basic
 
$
0.99

 
$
0.77

 
$
(0.57
)
Diluted
 
$
0.97

 
$
0.77

 
$
(0.57
)