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STOCK-BASED COMPENSATION (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
STOCK-BASED COMPENSATION |  |  |
Proceeds from stock option exercises | $ 73,905 | $ 55,347 | $ 64,759
Stock options |  |  |
STOCK-BASED COMPENSATION |  |  |
Award vesting period | 3 years |  |
Expiration period | 10 years |  |
Compensation expense | $ 15,200 | 16,900 | 17,900
Compensation expense, net of tax | 10,500 | 11,300 | 11,600
Income tax benefit related to compensation expense | 4,700 | 5,600 | 6,300
Fair value of shares vested | 16,900 | 17,200 | 16,100
Proceeds from stock option exercises | 73,900 |  |
Actual tax benefit realized for the tax deduction from option exercises | 15,800 |  |
Unrecognized compensation cost expected to be recognized in future periods | $ 13,600 |  |
Weighted-average period over which compensation cost is expected to be recognized | 1 year 9 months 18 days |  |
Stock options | Selling, research & development and administrative expenses |  |  |
STOCK-BASED COMPENSATION |  |  |
Compensation expense | $ 13,200 | 15,000 | 15,700
Restricted stock units |  |  |
STOCK-BASED COMPENSATION |  |  |
Compensation expense | 3,700 | 3,000 | 2,700
Actual tax benefit realized for the tax deduction from option exercises | 1,600 |  |
Unrecognized compensation cost expected to be recognized in future periods | $ 5,000 |  |
Weighted-average period over which compensation cost is expected to be recognized | 1 year 10 months 24 days |  |
Weighted-Average Grant-Date Fair Value |  |  |
Fair value of units vested | $ 4,700 | 1,900 | 757
Intrinsic value of units vested | $ 5,200 | $ 2,300 | $ 877
Stock Awards Plans | Stock options |  |  |
STOCK-BASED COMPENSATION |  |  |
Weighted-average fair value of stock options granted (in dollars per share) | $ 11.86 | $ 10.59 | $ 12.83
Assumptions used to estimate fair value of stock options granted |  |  |
Dividend Yield (as a percent) | 1.70% | 1.80% | 1.70%
Expected Stock Price Volatility (as a percent) | 15.80% | 16.90% | 21.90%
Risk-free Interest Rate (as a percent) | 2.20% | 1.60% | 1.60%
Expected Life of Option (years) | 6 years 8 months 12 days | 6 years 8 months 12 days | 6 years 10 months 24 days
Stock options activity |  |  |
Outstanding at the beginning of the period (in shares) | 8,070,444 |  |
Granted (in shares) | 1,622,082 |  |
Exercised (in shares) | (1,501,210) |  |
Forfeited or expired (in shares) | (131,997) |  |
Outstanding at the end of the period (in shares) | 8,059,319 | 8,070,444 |
Exercisable at the end of the period (in shares) | 5,151,257 |  |
Weighted Average Exercise Price |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 56.36 |  |
Granted (in dollars per share) | 74.90 |  |
Exercised (in dollars per share) | 46.65 |  |
Forfeited or expired (in dollars per share) | 70.70 |  |
Outstanding at the end of the period (in dollars per share) | 61.67 | $ 56.36 |
Exercisable at the end of the period (in dollars per share) | $ 55.72 |  |
Weighted-Average Remaining Contractual Term (Years): |  |  |
Outstanding at the end of the period | 6 years 1 month 6 days |  |
Exercisable at the end of the period | 4 years 9 months 18 days |  |
Aggregate Intrinsic Value: |  |  |
Outstanding at the end of the period | $ 198,358 |  |
Exercisable at the end of the period | 157,436 |  |
Intrinsic Value of Options Exercised | $ 51,140 | $ 44,972 | $ 43,041
Stock Awards Plans | Restricted stock units |  |  |
STOCK-BASED COMPENSATION |  |  |
Award vesting period | 3 years |  |
Restricted stock unit activity |  |  |
Balance at the beginning of the period (in shares) | 72,127 |  |
Granted (in shares) | 89,110 |  |
Vested (in shares) | (51,963) |  |
Balance at the end of the period (in shares) | 109,274 | 72,127 |
Weighted-Average Grant-Date Fair Value |  |  |
Nonvested at the beginning of the period (in dollars per share) | $ 69.31 |  |
Granted (in dollars per share) | 74.43 |  |
Vested (in dollars per share) | 68.52 |  |
Nonvested at the end of the period (in dollars per share) | $ 73.86 | $ 69.31 |
Director Stock Option Plans | Stock options |  |  |
Stock options activity |  |  |
Outstanding at the beginning of the period (in shares) | 281,334 |  |
Exercised (in shares) | (66,367) |  |
Outstanding at the end of the period (in shares) | 214,967 | 281,334 |
Exercisable at the end of the period (in shares) | 214,967 |  |
Weighted Average Exercise Price |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 56.45 |  |
Exercised (in dollars per share) | 53.23 |  |
Outstanding at the end of the period (in dollars per share) | 57.44 | $ 56.45 |
Exercisable at the end of the period (in dollars per share) | $ 57.44 |  |
Weighted-Average Remaining Contractual Term (Years): |  |  |
Outstanding at the end of the period | 5 years |  |
Exercisable at the end of the period | 5 years |  |
Aggregate Intrinsic Value: |  |  |
Outstanding at the end of the period | $ 6,199 |  |
Exercisable at the end of the period | 6,199 |  |
Intrinsic Value of Options Exercised | $ 1,995 | $ 548 | 1,478
Director Stock Option Plans | Restricted stock units |  |  |
STOCK-BASED COMPENSATION |  |  |
Award vesting period | 1 year |  |
Restricted stock unit activity |  |  |
Balance at the beginning of the period (in shares) | 15,745 |  |
Granted (in shares) | 14,793 |  |
Vested (in shares) | (15,745) |  |
Balance at the end of the period (in shares) | 14,793 | 15,745 |
Weighted-Average Grant-Date Fair Value |  |  |
Nonvested at the beginning of the period (in dollars per share) | $ 75.56 |  |
Granted (in dollars per share) | 80.45 |  |
Vested (in dollars per share) | 75.56 |  |
Nonvested at the end of the period (in dollars per share) | $ 80.45 | $ 75.56 |
New long-term incentive program |  |  |
STOCK-BASED COMPENSATION |  |  |
Compensation expense | $ 1,500 | $ (1,000) | $ 1,200
Performance period used to measure cumulative total shareholder return of common stock | 3 years |  |
Expected total expense related to program over the performance period | $ 3,400 |  |

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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + 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)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option 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)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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