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Stock-Based Compensation Plan - Stock Option Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Outstanding Options      
Beginning balance, Outstanding (in shares) 4,111    
Granted (in shares) 0    
Exercised (in shares) (27)    
Forfeited (in shares) (1,923)    
Ending balance, Outstanding (in shares) 2,161 4,111  
Options vested and exercisable (in shares) 1,385    
Weighted- Average Exercise Price      
Beginning balance, Outstanding (in USD per share) $ 8.53    
Granted (in USD per share) 0    
Exercised (in USD per share) 2.36    
Forfeited (in USD per share) 8.55    
Ending balance, Outstanding (in USD per share) 8.59 $ 8.53  
Options vested and exercisable (in USD per share) $ 8.56    
Aggregate Intrinsic Value      
Beginning balance, Outstanding $ 37    
Granted 0    
Exercised 68 $ 1,000 $ 1,300
Forfeited 5    
Ending balance, Outstanding 2 $ 37  
Options vested and exercisable $ 2    
Weighted average remaining contractual life, vested 5 years 10 months 13 days    
Weighted average remaining contractual life, exercisable 4 years 6 months 21 days