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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs | The components and classification of stock-based compensation expense were as follows (in thousands):
| Three Months Ended
| March 31, 2017 |  | April 1, 2016
Stock options | $ | 710 |  |  | $ | 609 |
Restricted stock and restricted stock units | 3,959 |  |  | 2,226 |
Total stock-based compensation expense | $ | 4,669 |  |  | $ | 2,835 |
Cost of sales | $ | 142 |  |  | $ | 197 |
Selling, general and administrative expenses | 2,159 |  |  | 1,655 |
Research, development and engineering costs, net | 105 |  |  | 177 |
Other operating expenses, net | 2,263 |  |  | 806 |
Total stock-based compensation expense | $ | 4,669 |  |  | $ | 2,835 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | The weighted average fair value and assumptions used to value options granted are as follows:
| Three Months Ended
| March 31, 2017 |  | April 1, 2016
Weighted average fair value | $ | 9.14 |  |  | $ | 12.81 |
Risk-free interest rate | 1.63 | % |  | 1.69 | %
Expected volatility | 38 | % |  | 26 | %
Expected life (in years) | 4 |  |  | 5 |
Expected dividend yield | — | % |  | — | %
Schedule of Share-based Compensation, Stock Options Activity | The following table summarizes the Company’s stock option activity:
| Number of Stock Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life (In Years) |  | Aggregate Intrinsic Value (In Millions)
Outstanding at December 30, 2016 | 1,739,972 |  |  | $ | 28.26 |  |  |  |  |
Granted | 33,636 |  |  | 29.55 |  |  |  |  |
Exercised | (343,898 | ) |  | 21.66 |  |  |  |  |
Forfeited or expired | (9,490 | ) |  | 45.82 |  |  |  |  |
Outstanding at March 31, 2017 | 1,420,220 |  |  | $ | 29.77 |  |  | 6.4 |  | $ | 17.8 |
Exercisable at March 31, 2017 | 1,164,993 |  |  | $ | 27.94 |  |  | 5.8 |  | $ | 16.1 |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity | The following table summarizes time-vested restricted stock and RSU activity:
| Time-Vested Activity |  | Weighted Average Fair Value
Nonvested at December 30, 2016 | 39,394 |  |  | $ | 45.51 |
Granted | 250,132 |  |  | 32.10 |
Vested | (7,797 | ) |  | 29.55 |
Forfeited | (2,321 | ) |  | 40.72 |
Nonvested at March 31, 2017 | 279,408 |  |  | $ | 33.99 |
The following table summarizes PSU activity:
| Performance- Vested Activity |  | Weighted Average Fair Value
Nonvested at December 30, 2016 | 356,586 |  |  | $ | 31.87 |
Granted | 370,815 |  |  | 30.58 |
Forfeited | (134,223 | ) |  | 31.40 |
Nonvested at March 31, 2017 | 593,178 |  |  | $ | 31.18 |

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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=6415400&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=6415400&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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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired 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=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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