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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2021
Schedule of Total Stock-Based Compensation Expense Included in Company's Condensed Consolidated Statements of Operations and Comprehensive Income | The total stock-based compensation expense included in the Company’s condensed consolidated statements of operations and comprehensive income was as follows:
|  | Three Months Ended March 31, |
|  | 2021 |  |  | 2020 |
Cost of revenues |  | $ | 1.0 |  |  | $ | 1.0 |
Research and development |  |  | 1.1 |  |  |  | 1.1 |
Selling, general and administrative |  |  | 7.9 |  |  |  | 5.9 |
Acquisition and integration costs |  |  | — |  |  |  | 0.5 |
Total pre-tax stock-based compensation expense |  | $ | 10.0 |  |  | $ | 8.5 |
Summary of Activity for RSUs | The following table presents the activity for RSUs under the 2014 Plan:
|  | Three Months Ended March 31, 2021 |
|  | Outstanding RSUs |  |  | Weighted Average Grant Date Fair Value |
RSUs – beginning of period |  |  | 606,085 |  |  | $ | 93.26 |
Accrued dividend shares |  |  | 79 |  |  | $ | 153.00 |
Granted |  |  | 101,668 |  |  | $ | 170.60 |
Vested |  |  | (78,506 | ) |  | $ | 97.20 |
Forfeited |  |  | (7,381 | ) |  | $ | 102.00 |
RSUs – end of period |  |  | 621,945 |  |  | $ | 105.31 |
Stock Appreciation Rights (SARs) [Member] |
Summary of Activity for SARs | The following table presents the activity for SARs under the 2014 Plan:
|  | Three Months Ended March 31, 2021 |
|  | Outstanding SARs |  |  | Weighted Average Grant Date Fair Value |
SARs – beginning of period |  |  | 51,589 |  |  | $ | 30.64 |
Exercised |  |  | (15,921 | ) |  | $ | 29.92 |
SARs – end of period |  |  | 35,668 |  |  | $ | 30.96 |

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