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Long-Term Compensation Plan and Stock Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2020
Long-Term Compensation Plan and Stock Based Compensation |
Summary of compensation expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Six months ended | ​
​ | ​ | June 30, | ​ | June 30, |
​ |  | 2020 |  | 2019 |  | 2020 |  | 2019 | ​
in thousands | ​ | (in thousands) | ​ | (in thousands) | ​
Restricted stock | ​ | $ | 860 | ​ | $ | 677 | ​ | $ | 2,210 | ​ | $ | 1,229 | ​
Long-term compensation plan | ​ |  | 305 | ​ |  | 755 | ​ |  | 670 | ​ |  | 1,258 | ​
Total compensation | ​ | $ | 1,165 | ​ | $ | 1,432 | ​ | $ | 2,880 | ​ | $ | 2,487 | ​

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