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Earnings Per Share | 9 Months Ended
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Sep. 30, 2019
Earnings Per Share [Abstract] |
Earnings Per Share | ​ (9) Earnings Per Share Basic earnings per share was computed by dividing net income by the weighted-average number of Common Shares outstanding for each respective period. Diluted earnings per share was calculated by dividing net income by the weighted-average of all potentially dilutive Common Shares that were outstanding during the periods presented. Weighted-average Common Shares outstanding used in calculating basic and diluted earnings per share were as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Nine months ended | ​ | ​
​ | ​ | September 30, | ​ | September 30, | ​ | ​
​ |  | 2019 |  | 2018 |  | 2019 |  | 2018 | ​ | ​
Basic weighted-average Common Shares outstanding | ​ | 27,369,824 | ​ | 28,452,807 | ​ | 27,928,760 | ​ | 28,383,843 | ​ | ​
Effect of dilutive shares | ​ | 425,687 | ​ | 612,239 | ​ | 496,484 | ​ | 689,257 | ​ | ​
Diluted weighted-average Common Shares outstanding | ​ | 27,795,511 | ​ | 29,065,046 | ​ | 28,425,244 | ​ | 29,073,100 | ​ | ​
​ There were 578,966 and 626,500 performance-based right to receive Common Shares outstanding at September 30, 2019 and 2018, respectively. The right to receive Common Shares are included in the computation of diluted earnings per share based on the number of Common Shares that would be issuable if the end of the quarter were the end of the contingency period.

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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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