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Share-Based Compensation - Summary of Stock Options (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Shares [Roll Forward]    
Outstanding, beginning of period (in shares) 319,000  
Granted (in shares) 220,000 0
Exercised (in shares) (81,000)  
Forfeited (in shares) (5,000)  
Expired (in shares) (31,000)  
Outstanding, end of period (in shares) 422,000 319,000
Exercisable, end of period (in shares) 187,000  
Weighted-Average Exercise Price [Roll Forward]    
Outstanding, beginning of period (in dollars per share) $ 17.85  
Granted (in dollars per share) 16.78  
Exercised (in dollars per share) 12.67  
Forfeited (in dollars per share) 39.55  
Expired (in dollars per share) 20.76  
Outstanding, end of period (in dollars per share) 17.83 $ 17.85
Exercisable, end of period (in dollars per share) $ 17.54  
Weighted-Average Remaining Contractual Term [Abstract]    
Outstanding 5 years 2 months 12 days  
Exercisable 3 years  
Aggregate Intrinsic Value [Abstract]    
Outstanding, end of period $ 1,544  
Exercisable, end of period $ 927