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Common Stock and Earnings per Share (Tables)
 12 Months Ended
Dec. 31, 2012
Earnings Per Share, Basic and Diluted [Abstract]  
Schedule of earnings per share
The weighted average number of shares of Class A common stock and Class B common stock outstanding used to calculate basic and diluted earnings per share were as follows:
 
2012
 
2011
 
2010
Basic weighted average shares outstanding
8.384

 
8.383

 
8.328

Dilutive effect of restricted stock awards
0.030

 
0.025

 
0.016

Diluted weighted average shares outstanding
8.414

 
8.408

 
8.344

 
 
 
 
 
 
Continuing operations
$
5.04

 
$
9.49

 
$
5.66

Discontinued operations
7.93

 
9.85

 
3.89

Basic earnings per share
$
12.97

 
$
19.34

 
$
9.55

 
 
 
 
 
 
Continuing operations
$
5.02

 
$
9.46

 
$
5.65

Discontinued operations
7.90

 
9.82

 
3.88

Diluted earnings per share
$
12.92

 
$
19.28

 
$
9.53