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Stockholders' Equity (Tables)
12 Months Ended
Dec. 31, 2021
Stockholders' Equity [Abstract]  
Shares of common stock reserved for future issuance
At December 31, 2021, the Company had reserved shares of common stock for future issuance as follows:

Restricted stock units outstanding
   
877,000
 
Phantom stock units outstanding
   
212,000
 
2007 Stock Incentive Program - available to grant
   
1,975,000
 
Convertible senior notes, due 2025
   
14,867,369
 
Conversion of Class B common stock
   
12,097,148
 
 
   
30,028,517