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STOCK-BASED COMPENSATION (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
STOCK-BASED COMPENSATION |  |  |
Proceeds from stock option exercises | $ 64,003 | $ 36,015 | $ 42,684
Stock options |  |  |
STOCK-BASED COMPENSATION |  |  |
Award vesting period | 3 years |  |
Expiration period | 10 years |  |
Compensation expense | $ 17,900 | 18,000 | 13,700
Compensation expense, net of tax | 11,600 | 11,700 | 9,200
Income tax benefit related to compensation expense | 6,300 | 6,300 | 4,500
Fair value of shares vested | 16,100 | 14,100 | 13,000
Proceeds from stock option exercises | 64,000 |  |
Actual tax benefit realized for the tax deduction from option exercises | 12,500 |  |
Unrecognized compensation cost expected to be recognized in future periods | $ 12,800 |  |
Weighted-average period over which compensation cost is expected to be recognized | 1 year 3 months 18 days |  |
Stock options | Selling, research & development and administrative expenses |  |  |
STOCK-BASED COMPENSATION |  |  |
Compensation expense | $ 15,700 | 16,000 | 12,100
Restricted stock units |  |  |
STOCK-BASED COMPENSATION |  |  |
Compensation expense | 2,700 | 1,800 | 664
Unrecognized compensation cost expected to be recognized in future periods | $ 1,600 |  |
Weighted-average period over which compensation cost is expected to be recognized | 1 year 3 months 18 days |  |
Weighted-Average Grant-Date Fair Value |  |  |
Fair value of units vested | $ 757 | 614 | 571
Intrinsic value of units vested | $ 877 | $ 761 | $ 661
Stock Option Plans | Stock options |  |  |
STOCK-BASED COMPENSATION |  |  |
Weighted-average fair value of stock options granted (in dollars per share) | $ 12.83 | $ 14.82 | $ 10.16
Assumptions used to estimate fair value of stock options granted |  |  |
Dividend Yield (as a percent) | 1.70% | 1.70% | 1.80%
Expected Stock Price Volatility (as a percent) | 21.90% | 22.20% | 22.70%
Risk-free Interest Rate (as a percent) | 1.60% | 2.30% | 1.30%
Expected Life of Option (years) | 6 years 10 months 24 days | 6 years 10 months 24 days | 6 years 10 months 24 days
Stock options activity |  |  |
Outstanding at the beginning of the period (in shares) | 8,107,806 |  |
Granted (in shares) | 1,391,355 |  |
Exercised (in shares) | (1,416,507) |  |
Forfeited or expired (in shares) | (50,624) |  |
Outstanding at the end of the period (in shares) | 8,032,030 | 8,107,806 |
Exercisable at the end of the period (in shares) | 5,324,545 |  |
Weighted Average Exercise Price |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 46.74 |  |
Granted (in dollars per share) | 64.60 |  |
Exercised (in dollars per share) | 37.15 |  |
Forfeited or expired (in dollars per share) | 60.84 |  |
Outstanding at the end of the period (in dollars per share) | 51.44 | $ 46.74 |
Exercisable at the end of the period (in dollars per share) | $ 45.23 |  |
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 10 months 24 days |  |
Aggregate Intrinsic Value: |  |  |
Outstanding at the end of the period | $ 170,340 |  |
Exercisable at the end of the period | 145,978 |  |
Intrinsic Value of Options Exercised | $ 43,041 | $ 33,059 | $ 37,822
Stock Option 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) | 61,750,000 |  |
Granted (in shares) | 17,957,000 |  |
Vested (in shares) | (13,331,000) |  |
Balance at the end of the period (in shares) | 66,376,000 | 61,750,000 |
Weighted-Average Grant-Date Fair Value |  |  |
Nonvested at the beginning of the period (in dollars per share) | $ 64.09 |  |
Granted (in dollars per share) | 67.96 |  |
Vested (in dollars per share) | 56.75 |  |
Nonvested at the end of the period (in dollars per share) | $ 66.61 | $ 64.09 |
Director Stock Option Plans | Stock options |  |  |
STOCK-BASED COMPENSATION |  |  |
Weighted-average fair value of stock options granted (in dollars per share) |  | $ 14.07 | $ 10.89
Assumptions used to estimate fair value of stock options granted |  |  |
Dividend Yield (as a percent) |  | 1.80% | 1.90%
Expected Stock Price Volatility (as a percent) |  | 22.20% | 23.00%
Risk-free Interest Rate (as a percent) |  | 2.20% | 1.30%
Expected Life of Option (years) |  | 6 years 10 months 24 days | 6 years 10 months 24 days
Stock options activity |  |  |
Outstanding at the beginning of the period (in shares) | 368,668 |  |
Exercised (in shares) | (65,167) |  |
Outstanding at the end of the period (in shares) | 303,501 | 368,668 |
Exercisable at the end of the period (in shares) | 221,159 |  |
Weighted Average Exercise Price |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 53.52 |  |
Exercised (in dollars per share) | 41.93 |  |
Outstanding at the end of the period (in dollars per share) | 56.00 | $ 53.52 |
Exercisable at the end of the period (in dollars per share) | $ 53.22 |  |
Weighted-Average Remaining Contractual Term (Years): |  |  |
Outstanding at the end of the period | 6 years 9 months 18 days |  |
Exercisable at the end of the period | 6 years 4 months 24 days |  |
Aggregate Intrinsic Value: |  |  |
Outstanding at the end of the period | $ 5,052 |  |
Exercisable at the end of the period | 4,297 |  |
Intrinsic Value of Options Exercised | $ 1,478 | $ 741 | $ 732
Director Stock Option Plans | Restricted stock units |  |  |
Restricted stock unit activity |  |  |
Granted (in shares) | 18,857,000 |  |
Balance at the end of the period (in shares) | 18,857,000 |  |
Weighted-Average Grant-Date Fair Value |  |  |
Granted (in dollars per share) | $ 63.10 |  |
Nonvested at the end of the period (in dollars per share) | $ 63.10 |  |
New long-term incentive program |  |  |
STOCK-BASED COMPENSATION |  |  |
Compensation expense | $ 1,200 | $ 530 |
Performance period used to measure cumulative total shareholder return of common stock | 3 years |  |
Expected total expense related to program over the performance period | $ 2,700 |  |

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- Definition Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual 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 (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + 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 (j) -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 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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