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Common Stock (Tables)
 12 Months Ended
Dec. 31, 2014
Class of Stock Disclosures [Abstract]  
Common stock activity
The following table summarizes our shares outstanding for the three years ended December 31, 2014:

 
 
Class A Common Stock
 
Class B Common Stock
 
 
 
 
 
BALANCE, December 31, 2011
 
100,570,418

 
—

Option exercises
 
370,715

 
—

Restricted stock issuances, net of cancellations
 
182,537

 
—

Stock issuances from exercise of warrants
 
179,850

 
—

Restricted stock unit vesting
 
51,476

 
—

Purchase of treasury stock (see Note 9)
 
(178,749
)
 
—

 
 
 
 
 
BALANCE, December 31, 2012
 
101,176,247

 
—

Option exercises
 
543,221

 
—

Restricted stock issuances, net of cancellations
 
4,879

 
—

Stock issuances from exercise of warrants
 
4,481,656

 
—

Restricted stock unit vesting
 
88,330

 
—

Purchase of treasury stock (see Note 9)
 
(150,258
)
 
—

 
 
 
 
 
BALANCE, December 31, 2013
 
106,144,075

 
—

Option exercises
 
640,342

 
—

Restricted stock issuances, net of cancellations
 
9,090

 
—

Stock issuances from exercise of warrants
 
5,243,167

 
—

Restricted stock unit vesting
 
104,270

 
—

Purchase of treasury stock (see Note 9)
 
(141,257
)
 
—

 
 
 
 
 
BALANCE, December 31, 2014
 
111,999,687

 
—