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Long-Term Compensation Plan and Stock Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2021
Long-Term Compensation Plan and Stock Based Compensation |
Summary of compensation expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Six months ended | ​
​ | ​ | June 30, | ​ | June 30, |
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020 | ​
in thousands | ​ | (in thousands) | ​ | (in thousands) | ​
Stock-based compensation | ​ | $ | 1,292 | ​ | $ | 860 | ​ | $ | 2,634 | ​ | $ | 2,210 | ​
Other long-term incentive plan compensation | ​ |  | 275 | ​ |  | 305 | ​ |  | 474 | ​ |  | 670 | ​
Total compensation | ​ | $ | 1,567 | ​ | $ | 1,165 | ​ | $ | 3,108 | ​ | $ | 2,880 | ​

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- Definition Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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