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Common Stock (Tables)
 9 Months Ended
Sep. 30, 2012
Equity [Abstract]  
Common stock rollforward
The following is a summary of the changes in our common shares outstanding during the nine months ended September 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
6,057

 
—

 
—

 
—

 
—

 
—

 
—

 
6,057

Restricted stock used for tax withholding
(764
)
 
—

 
—

 
—

 
—

 
—

 
—

 
(764
)
Restricted stock forfeitures
(2,965
)
 
—

 
—

 
—

 
—

 
—

 
—

 
(2,965
)
Shares outstanding at September 30, 2012
68,493

 
357,882

 
209,882

 
279,999

 
504,276

 
1

 
3

 
1,420,536