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Equity Incentive Plan - Stock Options Outstanding (Details) - $ / shares
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Number of Stock Options      
Outstanding (shares) - Beginning Balance 2,214,193 2,227,193  
Forfeited (in shares) (50,169)    
Exercised (shares) (394,045) (13,000)  
Outstanding (shares) - Ending Balance 1,769,979 2,214,193 2,227,193
Exercisable (shares) 1,769,979    
Weighted Average Grant Date Fair Value      
Outstanding (usd per share) - Beginning Balance $ 4.01 $ 4.01  
Forfeited (usd per share)    
Exercised (usd per share) 3.96 3.93  
Outstanding (usd per share) - Ending Balance 4.02 4.01 $ 4.01
Exercisable (usd per share) 4.02    
Weighted Average Exercise Price      
Outstanding (usd per share) - Beginning Balance 13.94 13.93  
Forfeited (usd per share) 13.62    
Exercised (usd per share) 13.90 13.38  
Outstanding (usd per share) - Ending Balance 13.95 $ 13.94 $ 13.93
Exercisable (usd per share) $ 13.95    
Outstanding, weighted average contractual life (years) 2 years 11 months 12 days 3 years 11 months 15 days 4 years 11 months 15 days
Exercisable, weighted average contractual life (years) 2 years 11 months 12 days