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Stock Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
Long-Term Compensation Plan and Stock Based Compensation |
Summary of compensation expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ |  | For the year ended December 31,
​ |  | ​ | 2020 |  | 2019 |  | 2018
in thousands | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Restricted stock | ​ | ​ | $ | 4,740 | ​ | $ | 3,368 | ​ | $ | 3,973
Long-term compensation plan | ​ | ​ |  | 1,262 | ​ |  | 1,955 | ​ |  | 2,118
Total compensation | ​ | ​ | $ | 6,002 | ​ | $ | 5,323 | ​ | $ | 6,091
Restricted Stock, subject to time-based criteria |
Long-Term Compensation Plan and Stock Based Compensation |
Summary of restricted stock activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted- |  | ​ | Weighted-
​ | ​ | ​ | ​ | average | ​ | ​ | average
​ | ​ | ​ | ​ | remaining | ​ | ​ | grant date
(in thousands) | ​ | Shares | ​ | term (years) | ​ | ​ | fair value
Outstanding at January 1, 2020 |  | 121 |  | 1.71 | ​ | $ | 14.88
Shares vested |  | (65) |  |  | ​ |  | 14.47
Outstanding at December 31, 2020 |  | 56 |  | 0.89 | ​ | $ | 14.60
Time-Based Restricted Stock Units settled in stock |
Long-Term Compensation Plan and Stock Based Compensation |
Summary of restricted stock activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted- |  | ​ | Weighted-
​ | ​ | ​ | ​ | average | ​ | ​ | average
​ | ​ | ​ | ​ | remaining | ​ | ​ | grant date
(in thousands) | ​ | Shares | ​ | term (years) | ​ | ​ | fair value
Nonvested, January 1, 2020 |  | 190 |  | 2.54 | ​ | $ | 13.78
Shares vested |  | (121) |  |  | ​ |  | 14.91
Shares awarded |  | 331 |  |  | ​ |  | 17.81
Shares forfeited |  | (21) |  |  | ​ |  | 15.07
Nonvested, December 31, 2020 |  | 379 |  | 2.55 | ​ | $ | 16.87
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Restricted Stock, subject to performance criteria |
Long-Term Compensation Plan and Stock Based Compensation |
Summary of restricted stock activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted- | ​ | ​ | Weighted-
​ | ​ | Total | ​ | average | ​ | ​ | average
​ | ​ | Unvested | ​ | remaining | ​ | ​ | grant date
(in thousands) |  | Shares |  | term (years) |  | ​ | fair value
Unearned, January 1, 2020 |  | 492 | ​ | 1.25 | ​ | $ | 14.46
Shares vested |  | (102) | ​ | ​ | ​ |  | 14.46
Shares awarded |  | 78 | ​ | ​ | ​ |  | 19.72
Shares forfeited |  | (9) | ​ | ​ | ​ |  | 18.32
Unearned, December 31, 2020 |  | 459 | ​ | 0.83 | ​ | $ | 15.29
Market-Based Restricted Stock Units settled in stock |
Long-Term Compensation Plan and Stock Based Compensation |
Summary of restricted stock activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted- |  | ​ | Weighted-
​ | ​ | ​ | ​ | average | ​ | ​ | average
​ | ​ | ​ | ​ | remaining | ​ | ​ | grant date
(in thousands) | ​ | Shares | ​ | term (years) | ​ | ​ | fair value
Nonvested, January 1, 2020 |  | — |  | — | ​ | $ | -
Shares vested |  | — |  |  | ​ |  | -
Shares awarded |  | 52 |  | 2.00 | ​ |  | 28.44
Shares forfeited |  | — |  |  | ​ |  | -
Nonvested, December 31, 2020 |  | 52 |  | 2.00 | ​ | $ | 28.44

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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=116856206&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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