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Stock-Based Compensation | 3 Months Ended
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Mar. 31, 2021
Stock-Based Compensation |
Stock-Based Compensation | 6. Stock-Based Compensation Stock- Based Compensation Expense Stock-based compensation expense was included in the consolidated statements of income as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31,
(In thousands) |  | 2021 |  | 2020
General and administrative | ​ | $ | 451 | ​ | $ | 435
​ ​ ​ ​ ​ ​ Valuation Assumptions Black-Scholes-Merton assumptions used in calculating the estimated value of our stock options on the date of grant were as follows: ​
​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended |
​ |  | March 31, 2021 |
Risk-free interest rate |  | ​ | 1.1 | %
Expected term (in years) |  | ​ | 6.11 | ​
Volatility |  | ​ | 45.6 | %
Dividend yield |  | ​ | 0.0 | %
Weighted-average estimated fair value of stock options granted | ​ | $ | 5.42 | ​
​ There were no grants of stock options during the three months ended March 31, 2020.

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