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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Summary of Activity for RSUs | The following table presents the activity for RSUs under the Plans:
|  | Year Ended December 31, |
|  | 2017 |
|  | Non-vested RSUs |  |  | Weighted Average Grant Date Fair Value |
Non-vested RSUs — beginning of period |  |  | 1,325,516 |  |  | $ | 34.38 |
Accrued dividend shares Granted |  |  | 122 389,610 |  |  |  | 78.34 67.69 |
Vested |  |  | (684,967 | ) |  |  | 34.58 |
Forfeited or expired |  |  | (86,902 | ) |  |  | 38.97 |
Non-vested RSUs — end of period |  |  | 943,379 |  |  | $ | 47.57 |
Summary of Activity for Outstanding and Exercisable Stock Appreciation Rights | At December 31, 2017, the Company’s outstanding and exercisable SARs, 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 |
SARs outstanding |  |  | 282,907 |  |  | $ | 28.62 |  |  |  | 3.3 |  |  | $ | 18,639 |
SARs exercisable |  |  | 221,375 |  |  | $ | 27.92 |  |  |  | 3.0 |  |  | $ | 14,740 |
Effect of Recording Stock-Based Compensation | The following table reflects the effect of recording stock-based compensation for the years 2017, 2016 and 2015:
|  | Years Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Stock-based compensation expense by type of award: |  |  |  |  |  |  |  |  |  |  |  |
RSUs |  | $ | 22,428 |  |  | $ | 23,302 |  |  | $ | 11,885 |
SARs |  |  | 529 |  |  |  | 700 |  |  |  | — |
Employee stock purchase plan |  |  | 1,421 |  |  |  | 1,226 |  |  |  | 1,128 |
Total stock-based compensation |  |  | 24,378 |  |  |  | 25,228 |  |  |  | 13,013 |
Windfall tax effect on stock-based compensation |  |  | (11,071 | ) |  |  | — |  |  |  | — |
Net effect on net income |  | $ | 13,307 |  |  | $ | 25,228 |  |  | $ | 13,013 |
Effect on net earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.25 |  |  | $ | 0.47 |  |  | $ | 0.24 |
Diluted |  | $ | 0.24 |  |  | $ | 0.47 |  |  | $ | 0.24 |
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 2017, 2016 and 2015 was as follows:
|  | Years Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Cost of revenues |  | $ | 3,894 |  |  | $ | 2,997 |  |  | $ | 1,814 |
Research and development expense |  |  | 2,816 |  |  |  | 2,529 |  |  |  | 1,590 |
Selling, general and administrative expense |  |  | 17,668 |  |  |  | 19,702 |  |  |  | 9,609 |
Total pre-tax stock-based compensation expense |  | $ | 24,378 |  |  | $ | 25,228 |  |  | $ | 13,013 |
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, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Employee stock purchase plan rights: |  |  |  |  |  |  |  |  |  |  |  |
Expected life (years) |  |  | 0.5 |  |  |  | 0.5 |  |  |  | 0.5 |
Risk-free interest rate |  |  | 0.8 | % |  |  | 0.5 | % |  |  | 0.1 | %
Expected volatility |  |  | 26.5 | % |  |  | 25.4 | % |  |  | 26.4 | %
Expected annual dividends per share |  | $ | 0.69 |  |  | $ | 0.68 |  |  | $ | 0.675 |
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, |
|  | 2017 |
|  | Non-vested SARs |  |  | Weighted Average Base Value |
SARs — beginning of period |  |  | 599,334 |  |  | $ | 28.10 |
Exercised |  |  | (289,822 | ) |  |  | 27.60 |
Forfeited or expired |  |  | (26,605 | ) |  |  | 28.07 |
SARs Outstanding — end of period |  |  | 282,907 |  |  | $ | 28.62 |

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 + Details
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