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Maximum Potential Future Issuance of Performance Stock Options

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Percentage, Target Grant Date Value of Performance Based Equity Compensation, Nonqualified Stock Options

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Percentage, Target Grant Date Value of Performance Based Equity Compensation, Restricted Stock Awards

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Performance Awards Earned

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Target Grant Date Value of Performance Based Equity Compensation

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Targeted Total Shareholder Return Performance, Nonqualified Stock Options

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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.

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Unrecognized cost of unvested share-based compensation awards.

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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.

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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).

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The weighted average fair value at grant date for nonvested equity-based awards issued 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).

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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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.

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Discloses use of the simplified method to calculate the expected term that stock option awards under the specified plan will exist before being exercised or terminated, the reason and justification for its use, and the periods for which the method was used if it was not used in all periods presented.

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The estimated measure of the maximum 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.

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The estimated measure of the minimum 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.

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The maximum risk-free interest rate assumption that is used in valuing an option on its own shares.

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The minimum risk-free interest rate assumption that is used in valuing an option on its own shares.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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- Definition

Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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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.

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Net number of share options (or share units) granted during the period.

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Gross number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Price of a single share of a number of saleable stocks of a company.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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STOCK-BASED COMPENSATION (Details - CEO Awards) - USD ($) $ / shares in Units, $ in Thousands					12 Months Ended
	Feb. 16, 2018	Jan. 02, 2018	Jul. 26, 2017	Jul. 25, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	May 24, 2017
STOCK-BASED COMPENSATION
Share price					$ 219.57			$ 156.70
Target Grant Date Value of Performance Based Equity Compensation	$ 7,500			$ 87,500
Granted (in dollars per share)	$ 378.95	$ 340.25	$ 183.80
Percentage, Target Grant Date Value of Performance Based Equity Compensation, Restricted Stock Awards	50.00%			25.00%
Percentage, Target Grant Date Value of Performance Based Equity Compensation, Nonqualified Stock Options	50.00%			75.00%
Targeted Total Shareholder Return Performance, Nonqualified Stock Options	81.00%			110.00%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	13,163	58,010	402,694
Non-cash stock-based compensation expense before income taxes					$ 44,365	$ 23,361	$ 9,647
Annaul Grant Limit Per Employee, Shares					672,500
Weighted average fair value (in dollars per share)					$ 150.55	$ 105.15	$ 40.05
Maximum [Member]
STOCK-BASED COMPENSATION
Targeted Total Shareholder Return Performance, Nonqualified Stock Options	167.00%			167.00%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	21,982		672,499
Minimum [Member]
STOCK-BASED COMPENSATION
Targeted Total Shareholder Return Performance, Nonqualified Stock Options	41.00%			70.00%
Performance Shares [Member]
STOCK-BASED COMPENSATION
Unrecognized compensation cost					$ 10,300
Granted (in shares)				119,015	19,234
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross		26,674
Granted (in dollars per share)			$ 1,900,000		$ 178.85
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period					30,806
Fair value of RSUs and RSAs that vested during the year					$ 7,900	$ 400	$ 200
Performance-Based Restricted Stock [Member]
STOCK-BASED COMPENSATION
Unrecognized compensation cost					$ 1,400
Performance Awards Earned					19,175
Time-Vested Performance Shares [Member]
STOCK-BASED COMPENSATION
Unrecognized compensation cost					$ 13,100
Granted (in shares)		119,015
Granted (in dollars per share)		$ 21,900,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period					47,603
Fair value of RSUs and RSAs that vested during the year					$ 13,600
RSUs
STOCK-BASED COMPENSATION
Unrecognized compensation cost					$ 30,500
Weighted-average period for recognition of unrecognized compensation cost					2 years
Granted (in shares)					121,751
Granted (in dollars per share)					$ 272.93
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period					68,915
Fair value of RSUs and RSAs that vested during the year					$ 21,800	$ 11,500	$ 10,100
2018 RSU Grants
STOCK-BASED COMPENSATION
Unrecognized compensation cost					$ 2,900
Granted (in shares)	9,896
Granted (in dollars per share)	$ 378.95
Performance Options [Member]
STOCK-BASED COMPENSATION
Expected Volatility Rate, Minimum					50.00%	50.00%
Unrecognized compensation cost					$ 51,300
Weighted-average period for recognition of unrecognized compensation cost					3 years 8 months 12 days
Dividend yield					0.00%	0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number					447,193	402,694
Performance Awards Earned					312,008
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price					$ 200.51	$ 183.80
Granted (in shares)					44,499
Granted (in dollars per share)					$ 351.70
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period					0
Exercised (in dollars per share)					$ 0.00
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period					0
Forfeited (in dollars per share)					$ 0.00
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period					0
Expired (in dollars per share)					$ 0.00
Outstanding at the end of the period					8 years 7 months 15 days
Outstanding at the end of the period					$ 14,404
Options exercisable at the end of the period (in shares)					0
Options exercisable at the end of the period (in dollars per share)					$ 0.00
Options exercisable at the end of the period					0 years
Options exercisable at the end of the period					$ 0
Maximum Potential Future Issuance of Performance Stock Options				769,376
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	21,982	31,336
Granted (in dollars per share)			$ 9,500,000
Weighted average fair value (in dollars per share)					$ 296.80	$ 142.45
Expected Volatility Rate, Maximum					50.00%	50.00%
Risk Free Interest Rate, Minimum					2.38%	2.12%
Risk Free Interest Rate, Maximum					2.81%	2.12%
Performance Options [Member] \| Maximum [Member]
STOCK-BASED COMPENSATION
Expected Term, Simplified Method					P7Y1M24D	P7Y6M
Performance Options [Member] \| Minimum [Member]
STOCK-BASED COMPENSATION
Expected Term, Simplified Method					P7Y	P7Y6M
Chairman And Chief Executive Officer [Member]
STOCK-BASED COMPENSATION
Non-cash stock-based compensation expense before income taxes					$ 20,500	$ 8,900