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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of Activity for RSUs | The following table presents the activity for RSUs under the Plans:
|  | Year Ended December 31, |
|  | 2015 |
|  | Non-vested RSUs |  |  | Weighted Average Grant Date Fair Value |
Non-vested RSUs — beginning of period |  |  | 716,714 |  |  | $ | 28.67 |
Granted |  |  | 394,952 |  |  | $ | 32.89 |
Vested |  |  | (351,601 | ) |  | $ | 28.59 |
Forfeited or expired |  |  | (26,903 | ) |  | $ | 29.84 |
Non-vested RSUs — end of period |  |  | 733,162 |  |  | $ | 30.94 |
Summary of Activity for Options | The following table presents the activity for options under the Plans:
|  | Year Ended December 31, |
|  | 2015 |
|  | Options |  |  | Weighted Average Exercise Price |
Outstanding — beginning of period |  |  | 30,224 |  |  | $ | 19.67 |
Exercised |  |  | (30,100 | ) |  | $ | 19.68 |
Forfeited or expired |  |  | (124 | ) |  | $ | 18.16 |
Outstanding — end of period |  |  | — |  |  | $ | — |
Exercisable at end of period |  |  | — |  |  | $ | — |
Effect of Recording Stock-Based Compensation | The following table reflects the effect of recording stock-based compensation for the years 2015, 2014 and 2013:
|  | Years Ended December 31, |
Stock-based compensation expense by type of award: |  | 2015 |  |  | 2014 |  |  | 2013 |
Restricted stock units |  | $ | 11,885 |  |  | $ | 10,203 |  |  | $ | 12,982 |
Employee stock purchase plan |  |  | 1,128 |  |  |  | 1,112 |  |  |  | 1,010 |
Total stock-based compensation |  |  | 13,013 |  |  |  | 11,315 |  |  |  | 13,992 |
Tax effect on stock-based compensation |  |  | (836 | ) |  |  | (331 | ) |  |  | (495 | )
Net effect on net income |  | $ | 12,177 |  |  | $ | 10,984 |  |  | $ | 13,497 |
Effect on net earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.23 |  |  | $ | 0.21 |  |  | $ | 0.25 |
Diluted |  | $ | 0.23 |  |  | $ | 0.21 |  |  | $ | 0.25 |
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 2015, 2014 and 2013 was as follows:
|  | Years Ended December 31, |
|  | 2015 |  |  | 2014 |  |  | 2013 |
Cost of revenues |  | $ | 1,814 |  |  | $ | 1,960 |  |  | $ | 2,038 |
Research and development expense |  |  | 1,590 |  |  |  | 1,659 |  |  |  | 1,902 |
Selling, general and administrative expense |  |  | 9,609 |  |  |  | 7,696 |  |  |  | 10,052 |
Total pre-tax stock-based compensation expense |  | $ | 13,013 |  |  | $ | 11,315 |  |  | $ | 13,992 |
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, |
Employee stock purchase plan rights: |  | 2015 |  |  | 2014 |  |  | 2013 |
Expected life (years) |  |  | 0.5 |  |  |  | 0.5 |  |  |  | 0.5 |
Risk-free interest rate |  |  | 0.1 | % |  |  | 0.1 | % |  |  | 0.1 | %
Expected volatility |  |  | 26.4 | % |  |  | 26.4 | % |  |  | 27.7 | %
Expected annual dividends per share |  | $ | 0.675 |  |  | $ | 0.655 |  |  | $ | 0.64 |

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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 changes in outstanding nonvested restricted stock units. + 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)(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 employee stock purchase plans, including, but not limited to: (a) expected term, (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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