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7. Earnings Per Share (Tables)
3 Months Ended
Mar. 31, 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 Ended
March 31,
 20212020
Basic weighted average shares outstanding29,823 29,865 
Effect of potentially dilutive stock options and restricted stock awards
363 331 
Diluted weighted average common shares30,186 30,196 
Anti-dilutive shares23 62