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7. Earnings Per Share (Tables)
9 Months Ended
Sep. 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 EndedNine Months Ended
September 30,September 30,
 2021202020212020
Basic weighted average shares outstanding29,814 29,721 29,800 29,746 
Effect of potentially dilutive stock options and restricted stock awards
410 407 390 391 
Diluted weighted average common shares outstanding30,224 30,128 30,190 30,137 
Anti-dilutive shares32 41 18 17