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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2013
Stock-Based Compensation [Abstract] |
Schedule of Stock-Based Compensation Expense | The consolidated statements of operations for the years ended December 31, 2013, 2012 and 2011 include the following stock-based compensation expense related to stock option awards, restricted stock, restricted stock unit awards and the employee stock purchase plan (in thousands):
|  |  | 2013 |  | 2012 |  | 2011
Cost of sales |  | $ | 2,523 |  | $ | 2,694 |  | $ | 2,566
Selling and administrative expenses |  |  | 25,252 |  |  | 22,679 |  |  | 21,891
Research and development expenses |  |  | 3,933 |  |  | 3,810 |  |  | 3,122
| Total stock-based compensation |  | $ | 31,708 |  | $ | 29,183 |  | $ | 27,579
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 2013, 2012 and 2011 are as follows:
Options Issued and Significant Assumptions Used to Estimate Option Fair Values |  | 2013 |  | 2012 |  | 2011
Options issued in thousands |  | 428 |  | 699 |  | 658
Risk-free interest rate |  | 1.7% |  | 1.0% |  | 1.1%
Expected life in years |  | 5 |  | 6 |  | 6
Expected volatility |  | 0.248 |  | 0.265 |  | 0.376
Expected dividends |  | - |  | - |  | -
Weighted-Average Exercise Price and Fair Value of Options on the Date of Grant |  | 2013 |  | 2012 |  | 2011
Exercise price |  | $ | 97.74 |  | $ | 86.55 |  | $ | 79.10
Fair value |  | $ | 27.37 |  | $ | 23.97 |  | $ | 29.67
Stock Options Outstanding Roll Forward | T he following table summarizes stock option activity for the plans for the year ended December 31, 2013 (in thousands, except per share data):
|  |  |  | Number of Shares |  | Exercise Price per Share |  | Weighted-Average Exercise Price
Outstanding at December 31, 2012 |  | 4,809 |  | $ | 23.19 | to | $ | 87.06 |  | $ | 63.34
| Granted |  | 428 |  | $ | 88.71 | to | $ | 103.47 |  | $ | 97.74
| Exercised |  | (1,281) |  | $ | 23.19 | to | $ | 79.15 |  | $ | 50.89
| Canceled |  | (39) |  | $ | 36.25 | to | $ | 79.15 |  | $ | 72.42
Outstanding at December 31, 2013 |  | 3,917 |  | $ | 33.12 | to | $ | 103.47 |  | $ | 71.08
Stock Options Outstanding by Exercise Price Range | The following table details the weighted-average remaining contractual life of options outstanding at December 31, 2013 by range of exercise prices (in thousands, except per share data):
|  |  |  |  |  |  |  |  |  |  | Remaining |  |  |  |  |
|  |  |  |  |  | Number |  |  | Weighted- |  | Contractual |  | Number |  |  | Weighted-
|  |  |  |  |  | of Shares |  |  | Average |  | Life of Options |  | of Shares |  |  | Average
Exercise Price Range |  | Outstanding |  |  | Exercise Price |  | Outstanding |  | Exercisable |  |  | Exercise Price
$ | 33.12 | to | $ | 48.99 |  | 901 |  | $ | 43.85 |  | 2.4 |  | 898 |  | $ | 43.88
$ | 49.00 | to | $ | 78.99 |  | 840 |  | $ | 64.59 |  | 5.0 |  | 707 |  | $ | 64.68
$ | 79.00 | to | $ | 103.47 |  | 2,176 |  | $ | 84.86 |  | 8.4 |  | 637 |  | $ | 80.63
|  | Total |  | 3,917 |  | $ | 71.08 |  | 6.3 |  | 2,242 |  | $ | 60.88
Restricted Stock Units Unvested Roll Forward | The following table summarizes the unvested restricted stock unit award activity for the year ended December 31, 2013 (in thousands, except for per share amounts):
|  |  | Shares |  | Weighted-Average Price
Unvested at December 31, 2012 |  | 574 |  | $ | 67.28
| Granted |  | 303 |  | $ | 94.74
| Vested |  | (207) |  | $ | 60.65
| Forfeited |  | (28) |  | $ | 72.27
Unvested at December 31, 2013 |  | 642 |  | $ | 82.16

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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 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F Reference 4: 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 + 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 option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -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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