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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2018
Summary of Activity for RSUs | The following table presents the activity for RSUs under the Plans:
|  | Year Ended December 31, 2018 |
|  | Non-vested RSUs |  |  | Weighted Average Grant Date Fair Value |
Non-vested RSUs — beginning of period |  |  | 943,379 |  |  | $ | 47.57 |
Accrued dividend shares |  |  | 66 |  |  | $ | 94.11 |
Granted |  |  | 266,411 |  |  | $ | 111.64 |
Vested |  |  | (490,453 | ) |  | $ | 44.70 |
Forfeited or expired |  |  | (72,009 | ) |  | $ | 66.22 |
Non-vested RSUs — end of period |  |  | 647,394 |  |  | $ | 74.04 |
Summary of Activity for Outstanding and Exercisable Stock Appreciation Rights | At December 31, 2018, 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 and exercisable |  |  | 177,538 |  |  | $ | 28.52 |  |  |  | 2.4 |  |  | $ | 6,408 |
Effect of Recording Stock-Based Compensation | The following table reflects the effect of recording stock-based compensation for the years 2018, 2017 and 2016:
|  | Years Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Stock-based compensation expense by type of award: |  |  |  |  |  |  |  |  |  |  |  |
RSUs |  | $ | 24,883 |  |  | $ | 22,428 |  |  | $ | 23,302 |
SARs |  |  | 98 |  |  |  | 529 |  |  |  | 700 |
Employee stock purchase plan |  |  | 2,281 |  |  |  | 1,421 |  |  |  | 1,226 |
Total stock-based compensation |  | $ | 27,262 |  |  |  | 24,378 |  |  |  | 25,228 |
Windfall tax effect on stock-based compensation |  |  | (8,277 | ) |  |  | (11,071 | ) |  |  | — |
Net effect on net income |  | $ | 18,985 |  |  | $ | 13,307 |  |  | $ | 25,228 |
Effect on net earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.35 |  |  | $ | 0.25 |  |  | $ | 0.47 |
Diluted |  | $ | 0.35 |  |  | $ | 0.24 |  |  | $ | 0.47 |
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 2018, 2017 and 2016 was as follows:
|  | Years Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Cost of revenues |  | $ | 3,516 |  |  | $ | 3,894 |  |  | $ | 2,997 |
Research and development expense |  |  | 2,750 |  |  |  | 2,816 |  |  |  | 2,529 |
Selling, general and administrative expense |  |  | 20,996 |  |  |  | 17,668 |  |  |  | 19,702 |
Total pre-tax stock-based compensation expense |  | $ | 27,262 |  |  | $ | 24,378 |  |  | $ | 25,228 |
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, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Employee stock purchase plan rights: |  |  |  |  |  |  |  |  |  |  |  |
Expected life (years) |  |  | 0.5 |  |  |  | 0.5 |  |  |  | 0.5 |
Risk-free interest rate |  |  | 1.8 | % |  |  | 0.8 | % |  |  | 0.5 | %
Expected volatility |  |  | 38.6 | % |  |  | 26.5 | % |  |  | 25.4 | %
Expected annual dividends per share |  | $ | 0.76 |  |  | $ | 0.69 |  |  | $ | 0.68 |
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, 2018 |
|  | Non-vested SARs |  |  | Weighted Average Base Value |
SARs — beginning of period |  |  | 282,907 |  |  | $ | 28.62 |
Exercised |  |  | (103,419 | ) |  | $ | 28.78 |
Forfeited or expired |  |  | (1,950 | ) |  | $ | 29.00 |
SARs Outstanding — end of period |  |  | 177,538 |  |  | $ | 28.52 |

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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://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=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 + Details
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