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Calculation of Earnings Per Share - Calculation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Earnings Per Share [Abstract] |  |  |  |
Income (Loss) from Continuing Operations, Per Basic Share | $ 0.56 | $ 0.38 | $ 2.97 | $ 2.68
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share | $ 0 | $ (0.04) | $ 0.01 | $ (0.08)
Calculation of Basic Earnings Per Share: |  |  |  |
Net Income | $ 9,261 | $ 5,621 | $ 49,146 | $ 42,589
Weighted shares outstanding (shares) | 16,533,748 | 16,403,776 | 16,466,106 | 16,396,646
Basic Earnings Per Share (in dollars per share) | $ 0.56 | $ 0.34 | $ 2.98 | $ 2.60
Reconciliation of Numerator: |  |  |  |
Net Income | $ 9,261 | $ 5,621 | $ 49,146 | $ 42,589
Reconciliation of Denominator: |  |  |  |
Weighted shares outstanding - Basic (shares) | 16,533,748 | 16,403,776 | 16,466,106 | 16,396,646
Effect of dilutive securities: |  |  |  |
Share-based compensation (shares) | 59,094 | 50,091 | 57,094 | 47,585
Adjusted denominator-Diluted (shares) | 16,592,842 | 16,453,867 | 16,523,200 | 16,444,231
Income (Loss) from Continuing Operations, Per Diluted Share | $ 0.56 | $ 0.38 | $ 2.96 | $ 2.67
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share | 0 | (0.04) | 0.01 | (0.08)
Diluted Earnings Per Share (in dollars per share) | $ 0.56 | $ 0.34 | $ 2.97 | $ 2.59
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax | $ (19) | $ (630) | $ 165 | $ (1,388)
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax | (19) | (630) | 165 | (1,388)
Net Income | $ 9,261 | $ 5,621 | $ 49,146 | $ 42,589
Basic (shares) | 16,533,748 | 16,403,776 | 16,466,106 | 16,396,646
Income (Loss) from Continuing Operations, Per Basic Share | $ 0.56 | $ 0.38 | $ 2.97 | $ 2.68
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share | 0 | (0.04) | 0.01 | (0.08)
Basic (in dollars per share) | $ 0.56 | $ 0.34 | $ 2.98 | $ 2.60
Share-based compensation (shares) | 59,094 | 50,091 | 57,094 | 47,585
Diluted (shares) | 16,592,842 | 16,453,867 | 16,523,200 | 16,444,231
Income (Loss) from Continuing Operations, Per Diluted Share | $ 0.56 | $ 0.38 | $ 2.96 | $ 2.67
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share | $ 0 | $ (0.04) | $ 0.01 | $ (0.08)
Retained Earnings [Member] |  |  |  |
Earnings Per Share [Abstract] |  |  |  |
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent | $ 9,280 | $ 6,251 | $ 48,981 | $ 43,977
Calculation of Basic Earnings Per Share: |  |  |  |
Net Income | 9,261 | 5,621 | 49,146 | 42,589
Reconciliation of Numerator: |  |  |  |
Net Income | 9,261 | 5,621 | 49,146 | 42,589
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent | 9,280 | 6,251 | 48,981 | 43,977
Net Income | $ 9,261 | $ 5,621 | $ 49,146 | $ 42,589

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