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Earnings Per Share | 9 Months Ended
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Sep. 30, 2018
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings Per Share The following table sets forth the computation of basic and diluted earnings per share for the periods indicated:
(Dollars and shares in thousands, except per share amounts) | Three Months Ended |  | Nine Months Ended
September 30, 2018 |  | September 30, 2017 |  | September 30, 2018 |  | September 30, 2017
Numerator: |  |  |  |  |  |  |
Net income | $ | 19,734 |  |  | $ | 25,532 |  |  | $ | 63,199 |  |  | $ | 73,460 |
Denominator: |  |  |  |  |  |  |  |
Weighted-average shares outstanding - basic | 18,403 |  |  | 18,181 |  |  | 18,360 |  |  | 18,126 |
Effect of dilutive shares | 275 |  |  | 407 |  |  | 289 |  |  | 377 |
Weighted-average shares outstanding - diluted | 18,678 |  |  | 18,588 |  |  | 18,649 |  |  | 18,503 |
Basic earnings per share | $ | 1.07 |  |  | $ | 1.40 |  |  | $ | 3.44 |  |  | $ | 4.05 |
Diluted earnings per share | $ | 1.06 |  |  | $ | 1.37 |  |  | $ | 3.39 |  |  | $ | 3.97 |
Certain potential options to purchase shares may be excluded from the calculation of diluted weighted-average shares outstanding where their exercise price is greater than the average market price of our capital stock during the relevant reporting period. For the three months ended September 30, 2018, 37,700 shares were excluded. For the three months ended September 30, 2017, no shares were excluded.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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