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STOCK-BASED COMPENSATION (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
STOCK-BASED COMPENSATION |  |
Proceeds from stock option exercises | $ 34,880 | $ 18,705
Stock options |  |
STOCK-BASED COMPENSATION |  |
Award vesting period | 3 years |
Expiration period | 10 years |
Compensation expense | $ 4,900 | 6,900
Compensation expense, net of tax | 3,500 | 4,600
Income tax benefit related to compensation expense | 1,400 | 2,300
Fair value of shares vested | 16,500 | 16,900
Proceeds from stock option exercises | 34,900 |
Actual tax benefit realized for the tax deduction from option exercises | 6,000 |
Unrecognized compensation cost expected to be recognized in future periods | $ 17,400 |
Weighted-average period over which compensation cost is expected to be recognized | 2 years |
Stock options | Selling, research & development and administrative expenses |  |
STOCK-BASED COMPENSATION |  |
Compensation expense | $ 4,000 | 6,000
Restricted stock units |  |
STOCK-BASED COMPENSATION |  |
Compensation expense | 2,600 | 900
Actual tax benefit realized for the tax deduction from option exercises | 383 |
Unrecognized compensation cost expected to be recognized in future periods | $ 24,400 |
Weighted-average period over which compensation cost is expected to be recognized | 2 years 8 months 12 days |
Weighted-Average Grant-Date Fair Value |  |
Fair value of units vested | $ 1,000 | 2,800
Intrinsic value of units vested | $ 1,300 | $ 3,000
Restricted stock units (time-based) |  |
STOCK-BASED COMPENSATION |  |
Award vesting period | 3 years |
Restricted stock unit activity |  |
Balance at the beginning of the period (in shares) | 124,067 |
Granted (in shares) | 80,067 |
Vested (in shares) | (14,281) |
Balance at the end of the period (in shares) | 189,853 |
Weighted-Average Grant-Date Fair Value |  |
Nonvested at the beginning of the period (in dollars per share) | $ 74.65 |
Granted (in dollars per share) | 89.42 |
Vested (in dollars per share) | 71.72 |
Nonvested at the end of the period (in dollars per share) | $ 81.10 |
Restricted stock units (performance-based) |  |
STOCK-BASED COMPENSATION |  |
Award vesting period | 3 years |
Assumptions used to estimate fair value of stock options granted |  |
Dividend Yield (as a percent) | 1.43% |
Expected Stock Price Volatility (as a percent) | 12.30% |
Risk-free Interest Rate (as a percent) | 2.42% |
Assumptions used to estimate fair value of restricted stock units granted |  |
Fair value per stock award (in dollars per share) | $ 128.70 |
Grant date stock price (in dollars per share) | $ 89.42 |
Expected Stock Price Volatility (as a percent) | 12.30% |
Expected average volatility of peer companies (as a percent) | 27.50% |
Correlation assumption (as a percent) | 20.20% |
Risk-free Interest Rate (as a percent) | 2.42% |
Dividend Yield (as a percent) | 1.43% |
Restricted stock unit activity |  |
Granted (in shares) | 80,843 |
Balance at the end of the period (in shares) | 80,843 |
Weighted-Average Grant-Date Fair Value |  |
Granted (in dollars per share) | $ 111.55 |
Nonvested at the end of the period (in dollars per share) | 111.55 |
Stock Awards Plans | Stock options |  |
STOCK-BASED COMPENSATION |  |
Weighted-average fair value of stock options granted (in dollars per share) | $ 14.82 | $ 11.85
Assumptions used to estimate fair value of stock options granted |  |
Dividend Yield (as a percent) | 1.50% | 1.70%
Expected Stock Price Volatility (as a percent) | 14.20% | 15.80%
Risk-free Interest Rate (as a percent) | 2.80% | 2.20%
Expected Life of Option (years) | 6 years 7 months 6 days | 6 years 8 months 12 days
Stock options activity |  |
Outstanding at the beginning of the period (in shares) | 8,059,319 |
Granted (in shares) | 603,901 |
Exercised (in shares) | (613,913) |
Forfeited or expired (in shares) | (26,738) |
Outstanding at the end of the period (in shares) | 8,022,569 |
Exercisable at the end of the period (in shares) | 5,935,087 |
Weighted Average Exercise Price |  |
Outstanding at the beginning of the period (in dollars per share) | $ 61.67 |
Granted (in dollars per share) | 88.39 |
Exercised (in dollars per share) | 52.73 |
Forfeited or expired (in dollars per share) | 63.13 |
Outstanding at the end of the period (in dollars per share) | 64.36 |
Exercisable at the end of the period (in dollars per share) | $ 59.55 |
Weighted-Average Remaining Contractual Term (Years): |  |
Outstanding at the end of the period | 6 years 4 months 24 days |
Exercisable at the end of the period | 5 years 6 months |
Aggregate Intrinsic Value: |  |
Outstanding at the end of the period | $ 204,336 |
Exercisable at the end of the period | 179,720 |
Intrinsic Value of Options Exercised | $ 22,804 | $ 15,289
Assumptions used to estimate fair value of restricted stock units granted |  |
Expected Stock Price Volatility (as a percent) | 14.20% | 15.80%
Risk-free Interest Rate (as a percent) | 2.80% | 2.20%
Dividend Yield (as a percent) | 1.50% | 1.70%
Director Stock Option Plans | Stock options |  |
Stock options activity |  |
Outstanding at the beginning of the period (in shares) | 214,967 |
Exercised (in shares) | (44,000) |
Outstanding at the end of the period (in shares) | 170,967 |
Exercisable at the end of the period (in shares) | 170,967 |
Weighted Average Exercise Price |  |
Outstanding at the beginning of the period (in dollars per share) | $ 57.44 |
Exercised (in dollars per share) | 53.35 |
Outstanding at the end of the period (in dollars per share) | 58.49 |
Exercisable at the end of the period (in dollars per share) | $ 58.49 |
Weighted-Average Remaining Contractual Term (Years): |  |
Outstanding at the end of the period | 4 years 10 months 24 days |
Exercisable at the end of the period | 4 years 10 months 24 days |
Aggregate Intrinsic Value: |  |
Outstanding at the end of the period | $ 5,358 |
Exercisable at the end of the period | 5,358 |
Intrinsic Value of Options Exercised | $ 1,608 |
Director Stock Option Plans | Restricted stock units |  |
STOCK-BASED COMPENSATION |  |
Award vesting period | 1 year |
Director Stock Option Plans | Restricted stock units (time-based) |  |
Restricted stock unit activity |  |
Balance at the end of the period (in shares) | 14,793 |
New long-term incentive program |  |
STOCK-BASED COMPENSATION |  |
Compensation expense | $ 409 | $ 282
Expected total expense related to program over the performance period | $ 2,600 |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: 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 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=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + 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)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + 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=96867065&loc=d3e5070-113901 + Details
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