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Earnings Per Share - Dilutive Earnings Per Share (Details) - shares | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Earnings Per Share Basic And Diluted [Line Items] |  |  |  |
Basic (in shares) | 18,975,265 | 18,266,202 | 18,839,424 | 18,304,608
Diluted (in shares) | 18,975,265 | 18,267,043 | 18,840,149 | 18,310,654
Employee Stock Option |  |  |  |
Earnings Per Share Basic And Diluted [Line Items] |  |  |  |
Effect of exercise of options and Warrants (in shares) | 0 | 0 | 0 | 5,180
Warrant |  |  |  |
Earnings Per Share Basic And Diluted [Line Items] |  |  |  |
Effect of exercise of options and Warrants (in shares) | 0 | 841 | 725 | 866

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