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Stock-Based Compensation Plans (Tables) | 6 Months Ended
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Jun. 30, 2021
Share-based Payment Arrangement, Noncash Expense [Abstract] |
Schedule of components of stock compensation expense | The components of stock-based compensation expense were as follows:
| Three months ended June 30, |  | Six Months Ended June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
| (in thousands) |  | (in thousands)
2007 Stock Incentive Plan | $ | 957 |  |  | $ | 703 |  |  | $ | 1,642 |  |  | $ | 1,728 |
2018 Stock Incentive Plan | 3,507 |  |  | 2,237 |  |  | 5,506 |  |  | 3,297 |
Employee Stock Purchase Plan | 72 |  |  | 75 |  |  | 150 |  |  | 107 |
Total Stock Compensation Expense | $ | 4,536 |  |  | $ | 3,015 |  |  | $ | 7,298 |  |  | $ | 5,132 |
Summary of restricted stock activity | The following table summarizes restricted stock activity under the 2007 and 2018 Plans during the six months ended June 30, 2021:
| Shares
Balance as of December 31, 2020 | 581,715 |
Shares granted | 286,550 |
Shares forfeited | — |
Shares vested | (339,657) |
Balance as of June 30, 2021 | 528,608 |

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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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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + 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)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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