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Stock Based Compensation, Stock Option Activity (Details) - Stock Options [Member] - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value $ 0 $ 1
Options outstanding [Roll Forward]    
Outstanding at beginning of period (in shares) 311 9,904
Granted (in shares) 0 0
Exercised (in shares) (311) (9,593)
Expired (in shares) 0 0
Outstanding at end of period (in shares) 0 311
Exercisable at end of period (in shares) 0 311
Weighted average exercise price [Roll forward]    
Outstanding at beginning of period (in dollars per share) $ 12.60 $ 11.96
Granted (in dollars per share) 0 0
Exercised (in dollars per share) 12.60 11.94
Expired (in dollars per share) 0 0
Outstanding at end of period (in dollars per share) 0 12.60
Exercisable at end of period (in dollars per share) $ 0 $ 12.60
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value $ 0 $ 1