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Stock-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Company's stock-based compensation activity | Accounting for Stock-Based Compensation The Company recognizes stock-based expenses related to stock options and restricted stock awards on a straight-line basis, net of forfeitures, over the requisite service period of the awards, which is generally the vesting term of four years. Stock-based expenses related to performance share grants are measured based on grant date fair value and expensed on a straight-line basis over the service period of the awards, which is generally the vesting term of three years. The assumptions used to calculate the fair value of options or restricted stock units are evaluated and revised, as necessary, to reflect market conditions and the Company’s experience. The following table shows the Company’s stock-based compensation activity:
| Fiscal Years Ended December 31,
(in thousands) | 2017 |  | 2016 |  | 2015
Stock-based compensation expense recognized in operating expenses | $ | 12,744 |  |  | $ | 13,113 |  |  | $ | 11,212 |
Tax benefit of stock-based compensation expense in provision for income taxes | 4,575 |  |  | 4,757 |  |  | 3,987 |
Stock-based compensation expense, net of tax | $ | 8,169 |  |  | $ | 8,356 |  |  | $ | 7,225 |
Fair value of shares vested | $ | 11,043 |  |  | $ | 13,186 |  |  | $ | 10,997 |
Proceeds to the Company from the exercise of stock-based compensation | $ | 6,610 |  |  | $ | 7,976 |  |  | $ | 9,720 |
Tax benefit from exercise of stock-based compensation, including shortfall tax benefits | $ | — |  |  | $ | (251 | ) |  | $ | (318 | )
The stock-based compensation expense included in cost of sales, research and development and engineering expense, selling expense, or general and administrative expense depends on the job functions performed by the employees to whom the stock options were granted, or the restricted stock units were awarded. Stock-based compensation cost capitalized in inventory was $0.2 million in 2017, and was $0.4 million in both 2016 and 2015, respectively.
Schedule of unvested restricted stock unit activity | following table summarizes the Company’s unvested restricted stock unit activity for the year ended December 31, 2017:
| Shares (in thousands) |  | Weighted- Average Price |  | Aggregate Intrinsic Value * (in thousands)
Unvested Restricted Stock Units (RSUs) |  |
Outstanding at January 1, 2017 | 615 |  |  | $ | 31.81 |  |  | $ | 26,915 |
Awarded | 589 |  |  | 38.79 |  |  |  |
Vested | (336 | ) |  | 32.85 |  |  |  |
Forfeited | (172 | ) |  | 35.96 |  |  |  |
Outstanding at December 31, 2017 | 696 |  |  | $ | 35.34 |  |  | $ | 39,976 |
Outstanding and expected to vest at December 31, 2017 | 690 |  |  | $ | 35.33 |  |  | $ | 39,609 |
* The intrinsic value for outstanding and expected to vest is calculated using the closing price per share of $57.41, as reported by the New York Stock Exchange on December 31, 2017.
Summary of stock option activity | The following table summarizes the Company’s stock option activity for the year ended December 31, 2017:
| Shares (in thousands) |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Life |  | Aggregate Intrinsic Value* (in thousands)
Non-Qualified Stock Options |  |  |
Outstanding at January 1, 2017 | 251 |  |  | $ | 29.66 |  |  | 1.1 |  | $ | 3,538 |
Exercised | (223 | ) |  | $ | 29.66 |  |  |  |  |  |
Forfeited | — |  |  | $ | — |  |  |  |  |
Outstanding and exercisable at December 31, 2017 | 28 |  |  | $ | 29.66 |  |  | 0.1 |  | $ | 780 |
* The intrinsic value as of December 31, 2017 represents the amount by which the fair market value of the underlying common stock exceeds the exercise price of the option, and is calculated using the closing price per share of $57.41, as reported by the New York Stock Exchange on December 31, 2017.

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + 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 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -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 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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