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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2016
Summary of Activity for RSUs | The following table presents the activity for RSUs under the Plans:
|  | Year Ended December 31, |
|  | 2016 |
|  | Non-vested RSUs |  |  | Weighted Average Grant Date Fair Value |
Non-vested RSUs — beginning of period |  |  | 733,162 |  |  | $ | 30.94 |
Assumed RSUs from Newport acquisition |  |  | 360,674 |  |  |  | 35.01 |
Accrued dividend shares |  |  | 187 |  |  |  | 47.84 |
Granted |  |  | 746,721 |  |  |  | 35.62 |
Vested |  |  | (434,951 | ) |  |  | 31.20 |
Forfeited or expired |  |  | (80,277 | ) |  |  | 34.51 |
Non-vested RSUs — end of period |  |  | 1,325,516 |  |  | $ | 34.38 |
Summary of Activity for Outstanding and Exercisable Stock Appreciation Rights | At December 31, 2016, the Company’s outstanding and exercisable stock appreciation rights, the weighted-average base value, the weighted average remaining contractual life and the aggregate intrinsic value thereof, were as follows:
|  | Number of Shares |  |  | Weighted Average Base Value |  |  | Weighted Average Remaining Contractual Life (years) |  |  | Aggregate Intrinsic Value |
Stock appreciation rights outstanding |  |  | 599,334 |  |  | $ | 28.10 |  |  |  | 3.9 |  |  | $ | 18,758 |
Stock appreciation rights exercisable |  |  | 377,722 |  |  | $ | 26.62 |  |  |  | 3.3 |  |  | $ | 12,383 |
Effect of Recording Stock-Based Compensation | The following table reflects the effect of recording stock-based compensation for the years 2016, 2015 and 2014:
|  | Years Ended December 31, |
|  | 2016 |  |  | 2015 |  |  | 2014 |
Stock-based compensation expense by type of award: |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock units |  | $ | 23,302 |  |  | $ | 11,885 |  |  | $ | 10,203 |
Stock appreciation rights |  |  | 700 |  |  |  | — |  |  |  | — |
Employee stock purchase plan |  |  | 1,226 |  |  |  | 1,128 |  |  |  | 1,112 |
Total stock-based compensation |  |  | 25,228 |  |  |  | 13,013 |  |  |  | 11,315 |
Tax effect on stock-based compensation |  |  | (1,254 | ) |  |  | (836 | ) |  |  | (331 | )
Net effect on net income |  | $ | 23,974 |  |  | $ | 12,177 |  |  | $ | 10,984 |
Effect on net earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.45 |  |  | $ | 0.23 |  |  | $ | 0.21 |
Diluted |  | $ | 0.44 |  |  | $ | 0.23 |  |  | $ | 0.21 |
Pre-Tax Effect Within Consolidated Statements of Operations of Recording Stock-Based Compensation | The pre-tax effect within the consolidated statements of operations and comprehensive income of recording stock-based compensation for the years 2016, 2015 and 2014 was as follows:
|  | Years Ended December 31, |
|  | 2016 |  |  | 2015 |  |  | 2014 |
Cost of revenues |  | $ | 2,997 |  |  | $ | 1,814 |  |  | $ | 1,960 |
Research and development expense |  |  | 2,529 |  |  |  | 1,590 |  |  |  | 1,659 |
Selling, general and administrative expense |  |  | 19,702 |  |  |  | 9,609 |  |  |  | 7,696 |
Total pre-tax stock-based compensation expense |  | $ | 25,228 |  |  | $ | 13,013 |  |  | $ | 11,315 |
Fair Value of Employees' Purchase Rights Estimated using Black-Scholes Option-Pricing Model | The fair value of the employees’ purchase plan rights was estimated using the Black-Scholes option-pricing model with the following weighted average assumptions:
|  | Years Ended December 31, |
|  | 2016 |  |  | 2015 |  |  | 2014 |
Employee stock purchase plan rights: |  |  |  |  |  |  |  |  |  |  |  |
Expected life (years) |  |  | 0.5 |  |  |  | 0.5 |  |  |  | 0.5 |
Risk-free interest rate |  |  | 0.5 | % |  |  | 0.1 | % |  |  | 0.1 | %
Expected volatility |  |  | 25.4 | % |  |  | 26.4 | % |  |  | 26.4 | %
Expected annual dividends per share |  | $ | 0.68 |  |  | $ | 0.675 |  |  | $ | 0.655 |
Stock Appreciation Rights (SARs) [Member] |
Summary of Activity for Outstanding and Exercisable Stock Appreciation Rights | The following table presents the activity for SARs under the Plans:
|  | Year Ended December 31, |
|  | 2016 |
|  | Non-vested SARs |  |  | Weighted Average Base Value |
SARs — beginning of period |  |  | — |  |  | $ | — |
Assumed SARs from Newport acquisition |  |  | 899,851 |  |  |  | 27.71 |
Granted |  |  | — |  |  |  | — |
Exercised |  |  | (280,106 | ) |  |  | 26.70 |
Forfeited or expired |  |  | (20,411 | ) |  |  | 30.29 |
SARs Outstanding — end of period |  |  | 599,334 |  |  | $ | 28.10 |

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