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7. Earnings Per Share (Tables)
6 Months Ended
Jun. 30, 2021
Earnings Per Share [Abstract]  
Schedule of weighted-average common shares outstanding used to calculate basic and diluted earnings per shares and the anti-dilutive shares
The weighted average number of common shares outstanding used to calculate basic and diluted earnings per share, and the anti-dilutive shares that are excluded from the diluted earnings per share calculation are as follows (in thousands):
Three Months EndedSix Months Ended
June 30,June 30,
 2021202020212020
Basic weighted average shares outstanding29,764 29,652 29,793 29,759 
Effect of potentially dilutive stock options and restricted stock awards
384 406 374 372 
Diluted weighted average common shares outstanding30,148 30,058 30,167 30,131 
Anti-dilutive shares23 23 40