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Stock-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement, Noncash Expense [Abstract] |
Schedule of components of stock compensation expense | The components of stock compensation expense were as follows:
| Year Ended December 31,
| 2020 |  | 2019
| (in thousands)
2007 Stock Incentive Plan | $ | 3,142 |  |  | $ | 4,584 |
2018 Stock Incentive Plan | 7,960 |  |  | 3,117 |
Employee Stock Purchase Plan | 276 |  |  | 86 |
Total Stock Compensation Expense | $ | 11,378 |  |  | $ | 7,787 |
Summary of restricted stock activity | The following table summarizes restricted stock activity under the 2007 and 2018 Plans for the years ended December 31, 2020 and 2019:
| Number Outstanding |  | Weighted Average Grant Date Fair Value |  | Aggregate Grant Date Fair Value (in thousands)
Balance as of December 31, 2018 | 417,890 |  |  | $ | 30.54 |  |  | $ | 12,763 |
Shares granted | 279,400 |  |  | 42.28 |  |  | 11,813 |
Shares forfeited | (3,866) |  |  | 30.43 |  |  | (118) |
Shares vested | (187,957) |  |  | 28.74 |  |  | (5,402) |
Balance as of December 31, 2019 | 505,467 |  |  | 37.70 |  |  | 19,056 |
Shares granted | 319,350 |  |  | 19.00 |  |  | 6,068 |
Shares forfeited | — |  |  | — |  |  | — |
Shares vested | (243,102) |  |  | 28.35 |  |  | (6,892) |
Balance as of December 31, 2020 | 581,715 |  |  | $ | 31.34 |  |  | $ | 18,232 |

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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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