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Stock-Based Compensation (Tables) | 6 Months Ended
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Jul. 04, 2015
Stock-Based Compensation [Abstract] |
Schedule of Stock-Based Compensation Expense | The consolidated statements of operations for the three and six months ended July 4, 2015 and June 28, 2014 include the following stock-based compensation expense related to stock option awards, restricted stock, restricted stock unit awards and the employee stock purch ase plan (in thousands):
|  |  | Three Months Ended |  | Six Months Ended
|  |  | July 4, 2015 |  | June 28, 2014 |  | July 4, 2015 |  | June 28, 2014
Cost of sales |  | $ | 648 |  | $ | 672 |  | $ | 1,322 |  | $ | 1,428
Selling and administrative expenses |  |  | 6,426 |  |  | 6,555 |  |  | 13,060 |  |  | 12,990
Research and development expenses |  |  | 1,081 |  |  | 997 |  |  | 2,228 |  |  | 1,935
| Total stock-based compensation |  | $ | 8,155 |  | $ | 8,224 |  | $ | 16,610 |  | $ | 16,353
Relevant Data Used to Determine the Value of Stock Options Granted During the Period | The relevant d ata used to determine the value of the stock options granted during the six months ended July 4, 2015 and June 28, 2014 are as follows:
|  | Six Months Ended
Options Issued and Significant Assumptions Used to Estimate Option Fair Values |  | July 4, 2015 |  | June 28, 2014
Options issued in thousands |  | 37 |  | 32
Risk-free interest rate |  | 1.7% |  | 1.9%
Expected life in years |  | 4 |  | 4
Expected volatility |  | 0.262 |  | 0.245
Expected dividends |  | - |  | -
|  | Six Months Ended
Weighted-Average Exercise Price and Fair Value of Options on the Date of Grant |  | July 4, 2015 |  | June 28, 2014
Exercise price |  | $ | 116.65 |  | $ | 99.22
Fair value |  | $ | 28.17 |  | $ | 22.38
Stock Options Outstanding Roll Forward | T he following table summarizes stock option activity for the plans for the six months ended July 4, 2015 (in thousands, except per share data):
|  |  |  | Number of Shares |  | Price per Share |  | Weighted-Average Exercise Price
Outstanding at December 31, 2014 |  | 3,280 |  | $ | 37.84 | to | $ | 113.36 |  | $ | 82.85
| Granted |  | 37 |  | $ | 113.88 | to | $ | 134.37 |  | $ | 116.65
| Exercised |  | (296) |  | $ | 37.84 | to | $ | 98.21 |  | $ | 74.33
| Canceled |  | (72) |  | $ | 79.05 | to | $ | 87.06 |  | $ | 83.25
Outstanding at July 4, 2015 |  | 2,949 |  | $ | 38.09 | to | $ | 134.37 |  | $ | 84.12
Restricted Stock Units Unvested Roll Forward | The following table summarizes the unvested restricted stock unit award activity for the six months ended July 4, 2015 (in thousands, except for per share amounts):
|  |  | Shares |  | Weighted-Average Price
Unvested at December 31, 2014 |  | 533 |  | $ | 94.38
| Granted |  | 130 |  | $ | 118.83
| Vested |  | (143) |  | $ | 85.34
| Forfeited |  | (8) |  | $ | 99.68
Unvested at July 4, 2015 |  | 512 |  | $ | 103.03

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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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + 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=6415400&loc=d3e5070-113901 + 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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