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Common Stock (Tables)
6 Months Ended
Jun. 30, 2012
Equity [Abstract]  
Common stock rollforward
The following is a summary of the changes in our common shares outstanding during the six months ended June 30, 2012: 
 
Common Stock
 
Class A
 
Class B
 
Class C
 
Class D
 
Class E
 
Class F
 
Class G
 
Total
Shares outstanding at January 1, 2012
66,165

 
357,882

 
209,882

 
279,999

 
504,276

 
1

 
3

 
1,418,208

Restricted stock issuances
403

 

 

 

 

 

 

 
403

Restricted stock used for tax withholding
(643
)
 

 

 

 

 

 

 
(643
)
Restricted stock forfeitures
(1,895
)
 

 

 

 

 

 

 
(1,895
)
Shares outstanding at June 30, 2012
64,030

 
357,882

 
209,882

 
279,999

 
504,276

 
1

 
3

 
1,416,073