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Stockholders' Equity - Stock Option Activity Schedule (Details) - Stock Option Awards - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Number of Options    
Outstanding, Beginning of year (in shares) 2,030  
Issued (in shares) 279  
Exercise (in shares) 0  
Forfeited / canceled (in shares) (181)  
Outstanding, End of year (in shares) 2,128 2,030
Exercisable, end of year (in shares) 1,451  
Weighted-Average Exercise Price    
Outstanding, beginning of year (USD per share) $ 19.31  
Issued (USD per share) 19.73  
Exercised (USD per share) 0  
Forfeited / canceled (USD per share) 20.56  
Outstanding, end of year (USD per share) 19.26 $ 19.31
Exercisable, weighted average exercise price (USD per share) $ 19.86  
Weighted-Average Remaining Contractual Term in Years    
Outstanding 4 years 1 month 6 days 4 years 8 months 12 days
Options exercisable 3 years 1 month 6 days  
Aggregate Intrinsic Value    
Outstanding at Beginning $ 7,981  
Outstanding at ending 0 $ 7,981
Exercisable $ 0