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STOCK-BASED COMPENSATION (Details) - USD ($) $ / shares in Units, $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2020 | Jun. 30, 2019
STOCK-BASED COMPENSATION |  |
Proceeds from stock option exercises | $ 30,058 | $ 70,712
Stock options |  |
STOCK-BASED COMPENSATION |  |
Award vesting period | 3 years |
Expiration period | 10 years |
Compensation expense | $ 1,300 | 3,200
Compensation expense, net of tax | 1,000 | 2,700
Fair value of shares vested | 7,600 | 12,200
Proceeds from stock option exercises | 30,100 |
Actual tax benefit realized for the tax deduction from option exercises | 6,400 |
Unrecognized compensation cost expected to be recognized in future periods | $ 1,000 |
Weighted-average period over which compensation cost is expected to be recognized | 8 months 12 days |
Stock options | Selling, research & development and administrative expenses |  |
STOCK-BASED COMPENSATION |  |
Compensation expense | $ 1,100 | 2,700
Restricted stock units |  |
STOCK-BASED COMPENSATION |  |
Compensation expense | 16,300 | 9,800
Actual tax benefit realized for the tax deduction from option exercises | 3,000 |
Unrecognized compensation cost expected to be recognized in future periods | $ 58,800 |
Weighted-average period over which compensation cost is expected to be recognized | 2 years 2 months 12 days |
Weighted-Average Grant-Date Fair Value |  |
Fair value of units vested | $ 10,700 | 4,100
Intrinsic value of units vested | $ 12,800 | $ 4,800
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) | 480,729 |
Granted (in shares) | 229,033 |
Vested (in shares) | (125,020) |
Forfeited (in shares) | (5,692) |
Balance at the end of the period (in shares) | 579,050 |
Weighted-Average Grant-Date Fair Value |  |
Nonvested at the beginning of the period (in dollars per share) | $ 95.45 |
Granted (in dollars per share) | 85.57 |
Vested (in dollars per share) | 85.55 |
Forfeited (in dollars per share) | 99.08 |
Nonvested at the end of the period (in dollars per share) | $ 92.14 |
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) | 1.72% | 1.30%
Expected Stock Price Volatility (as a percent) | 23.80% | 16.50%
Risk-free Interest Rate (as a percent) | 0.31% | 2.19%
Assumptions used to estimate fair value of restricted stock units granted |  |
Fair value per stock award (in dollars per share) | $ 94.98 | $ 134.97
Grant date stock price (in dollars per share) | $ 83.93 | $ 104.51
Expected Stock Price Volatility (as a percent) | 23.80% | 16.50%
Expected average volatility of peer companies (as a percent) | 48.50% | 31.90%
Correlation assumption (as a percent) | 63.50% | 37.40%
Risk-free Interest Rate (as a percent) | 0.31% | 2.19%
Dividend Yield (as a percent) | 1.72% | 1.30%
Restricted stock unit activity |  |
Balance at the beginning of the period (in shares) | 181,680 |
Granted (in shares) | 417,313 |
Forfeited (in shares) | (6,714) |
Balance at the end of the period (in shares) | 592,279 |
Weighted-Average Grant-Date Fair Value |  |
Nonvested at the beginning of the period (in dollars per share) | $ 117.26 |
Granted (in dollars per share) | 93.08 |
Forfeited (in dollars per share) | 108.10 |
Nonvested at the end of the period (in dollars per share) | $ 100.29 |
Stock Awards Plans | Stock options |  |
Stock options activity |  |
Outstanding at the beginning of the period (in shares) | 5,044,180 |
Exercised (in shares) | (460,243) |
Forfeited or expired (in shares) | (14,200) |
Outstanding at the end of the period (in shares) | 4,569,737 |
Exercisable at the end of the period (in shares) | 4,416,415 |
Weighted Average Exercise Price |  |
Outstanding at the beginning of the period (in dollars per share) | $ 68.32 |
Exercised (in dollars per share) | 58.21 |
Forfeited or expired (in dollars per share) | 76.07 |
Outstanding at the end of the period (in dollars per share) | 69.38 |
Exercisable at the end of the period (in dollars per share) | $ 68.62 |
Weighted-Average Remaining Contractual Term (Years): |  |
Outstanding at the end of the period | 5 years |
Exercisable at the end of the period | 4 years 10 months 24 days |
Aggregate Intrinsic Value: |  |
Outstanding at the end of the period | $ 194,684 |
Exercisable at the end of the period | 190,936 |
Intrinsic Value of Options Exercised | $ 26,027 | $ 65,944
Director Stock Option Plans | Stock options |  |
Stock options activity |  |
Outstanding at the beginning of the period (in shares) | 135,251 |
Exercised (in shares) | (30,751) |
Outstanding at the end of the period (in shares) | 104,500 |
Exercisable at the end of the period (in shares) | 104,500 |
Weighted Average Exercise Price |  |
Outstanding at the beginning of the period (in dollars per share) | $ 58.45 |
Exercised (in dollars per share) | 51.22 |
Outstanding at the end of the period (in dollars per share) | 60.58 |
Exercisable at the end of the period (in dollars per share) | $ 60.58 |
Weighted-Average Remaining Contractual Term (Years): |  |
Outstanding at the end of the period | 3 years 1 month 6 days |
Exercisable at the end of the period | 3 years 1 month 6 days |
Aggregate Intrinsic Value: |  |
Outstanding at the end of the period | $ 4,902 |
Exercisable at the end of the period | 4,902 |
Intrinsic Value of Options Exercised | $ 1,973 | $ 722
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 |  |
Granted (in shares) | 12,379 |
Vested (in shares) | (11,490) |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&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://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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