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Income Taxes (Tables) | 6 Months Ended
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Jun. 30, 2019
Schedule of income tax expense reflected in the condensed consolidated statements of income | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Six Months Ended June 30, |
(Dollars in thousands) |  | 2019 |  | 2018 |
​ | ​ | ​ | ​ | ​ | ​ | ​ |
Revised Texas Franchise Tax | ​ | $ | 164 | ​ | $ | 134 | ​
Other Taxes | ​ |  | (112) | ​ |  | 23 | ​
Tax expense (benefit) | ​ | $ | 52 | ​ | $ | 157 | ​

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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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