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STOCK-BASED COMPENSATION (Details - Stock Options Rollforward) - USD ($) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 | May 24, 2017
Stock options, Grant Date Fair Value Valuation |  |
Share price | $ 420.03 | $ 156.70
Grant date fair value | $ 166.39 |
Aggregate stock options |  |
Stock options, Shares |  |
Outstanding at the beginning of the period (in shares) | 940,533 |
Granted (in shares) | 42,017 |
Exercised (in shares) | (108,418) |
Forfeited (in shares) | (25,270) |
Expired (in shares) | 0 |
Outstanding at the end of the period (in shares) | 848,862 |
Options exercisable at the end of the period (in shares) | 701,319 |
Stock options, Weighted Average Exercise Price |  |
Outstanding at the beginning of the period (in dollars per share) | $ 65.12 |
Granted (in dollars per share) | 322.17 |
Exercised (in dollars per share) | 41.36 |
Forfeited (in dollars per share) | 334.52 |
Expired (in dollars per share) | 0 |
Outstanding at the end of the period (in dollars per share) | 72.86 |
Options exercisable at the end of the period (in dollars per share) | $ 35.97 |
Stock options, Weighted Average Remaining Contractual Term |  |
Outstanding at the end of the period | 4 years 9 months 25 days |
Options exercisable at the end of the period | 3 years 11 months 26 days |
Stock options, Aggregate Intrinsic Value |  |
Outstanding at the end of the period | $ 294,700,000 |
Options exercisable at the end of the period | $ 269,348,000 |
Stock options, Grant Date Fair Value Valuation |  |
Expected dividend rate | 0.00% |
Expected volatility, minimum | 51.00% |
Expected volatility, maximum | 55.00% |
Risk-free interest rate, minimum | 1.88% |
Risk-free interest rate, maximum | 2.55% |
Expected dividends | $ 0 |
Performance options |  |
Stock options, Shares |  |
Outstanding at the beginning of the period (in shares) | 37,877 |
Granted (in shares) | 0 |
Exercised (in shares) | 0 |
Forfeited (in shares) | 0 |
Expired (in shares) | (11,876) |
Outstanding at the end of the period (in shares) | 26,001 |
Options exercisable at the end of the period (in shares) | 0 |
Stock options, Weighted Average Exercise Price |  |
Outstanding at the beginning of the period (in dollars per share) | $ 308.90 |
Granted (in dollars per share) | 0 |
Exercised (in dollars per share) | 0 |
Forfeited (in dollars per share) | 0 |
Expired (in dollars per share) | 308.90 |
Outstanding at the end of the period (in dollars per share) | 308.90 |
Options exercisable at the end of the period (in dollars per share) | $ 0 |
Stock options, Weighted Average Remaining Contractual Term |  |
Outstanding at the end of the period | 1 year 29 days |
Options exercisable at the end of the period | 0 years |
Stock options, Aggregate Intrinsic Value |  |
Outstanding at the end of the period | $ 2,889,000 |
Options exercisable at the end of the period | $ 0 |
Market options |  |
Stock options, Shares |  |
Outstanding at the beginning of the period (in shares) | 447,193 |
Granted (in shares) | 16,247 |
Exercised (in shares) | 0 |
Forfeited (in shares) | 0 |
Expired (in shares) | 0 |
Outstanding at the end of the period (in shares) | 463,440 |
Options exercisable at the end of the period (in shares) | 0 |
Stock options, Weighted Average Exercise Price |  |
Outstanding at the beginning of the period (in dollars per share) | $ 200.51 |
Granted (in dollars per share) | 308.96 |
Exercised (in dollars per share) | 0 |
Forfeited (in dollars per share) | 0 |
Expired (in dollars per share) | 0 |
Outstanding at the end of the period (in dollars per share) | 204.31 |
Options exercisable at the end of the period (in dollars per share) | $ 0 |
Stock options, Weighted Average Remaining Contractual Term |  |
Outstanding at the end of the period | 8 years 2 months 1 day |
Options exercisable at the end of the period | 0 years |
Stock options, Aggregate Intrinsic Value |  |
Outstanding at the end of the period | $ 99,974,000 |
Options exercisable at the end of the period | $ 0 |
Stock options, Grant Date Fair Value Valuation |  |
Grant date fair value | $ 230.81 |
Expected term | P7Y |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate | 51.00% |
Expected dividend rate | 0.00% |
Risk-free interest rate | 2.54% |
Expected dividends | $ 0 |
Maximum number of shared to be earned | 773,945 |
Percentage of target number of shares | 167.00% |
Performance Awards Earned | 481,669 |
Minimum | Aggregate stock options |  |
Stock options, Grant Date Fair Value Valuation |  |
Expected term | P5Y |
Minimum | Employee stock options |  |
Stock options, Grant Date Fair Value Valuation |  |
Grant date fair value |  |
Maximum | Aggregate stock options |  |
Stock options, Grant Date Fair Value Valuation |  |
Expected term | P6Y3M |
Maximum | Employee stock options |  |
Stock options, Grant Date Fair Value Valuation |  |
Grant date fair value |  |
100% over a period of one year from the grant date | Employee stock options |  |
Stock options, Grant Date Fair Value Valuation |  |
Vesting period | 1 year |
33% over a period of three years from the grant date | Employee stock options |  |
Stock options, Grant Date Fair Value Valuation |  |
Vesting period | 3 years |
25% over a period of four years from the grant date | Employee stock options |  |
Stock options, Grant Date Fair Value Valuation |  |
Vesting period | 4 years |

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- Definition The estimated amount of dividends to be paid to holders of the underlying shares (expected dividends) over the option's term. Dividends are taken into account because payment of dividends to shareholders reduces the fair value of the underlying shares, and option holders generally do not receive dividends. + 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 (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + 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 (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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