v2.4.0.8
Stockholders' Equity (Details)
12 Months Ended
Dec. 31, 2013
item
Dec. 31, 2012
Stockholders Equity (Deficit)    
Preferred stock outstanding (in shares) 0 0
Class A common stock
   
Stockholders Equity (Deficit)    
Votes per share 1  
Common stock, shares outstanding 42,838,638 39,917,044
Class B common stock
   
Stockholders Equity (Deficit)    
Votes per share 10  
Number of shares of Class A common stock into which each share of common stock is convertible 1  
Common stock, shares outstanding 47,687,039 47,687,039
Class C common stock
   
Stockholders Equity (Deficit)    
Votes per share 1  
Number of shares of Class A common stock into which each share of common stock is convertible 1  
Votes per share in event of change of control 10  
Common stock, shares outstanding 0 0
Class D common stock
   
Stockholders Equity (Deficit)    
Common stock, shares outstanding 0 0