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The increase in the number of authorized shares under the Plan.

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Share-based Compensation Arrangement by Share-based Payment Award, Number of Plans

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Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other Than Options, Vested But Not Issued In Period

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of cost capitalized for award under share-based payment arrangement.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of tax benefit from exercise of option under share-based payment arrangement.

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Amount of cash inflow from issuance of shares under share-based payment arrangement. Includes, but is not limited to, option exercised.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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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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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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Number of shares authorized for issuance under share-based payment arrangement.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Number of shares issued under share-based payment arrangement.

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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.

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STOCK-BASED COMPENSATION (Narrative) (Details) $ in Thousands	1 Months Ended		12 Months Ended
	May 31, 2017 shares	May 31, 2010 shares	Dec. 31, 2020 USD ($) plan shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for purchase (in shares) \| shares			1,900,000
Number of stock-based compensation plans \| plan			3
Dividend yield			0.00%	0.00%	0.00%
Share-based compensation expense recognized			$ 19,591	$ 21,255	$ 20,779
Intrinsic value, options exercised			8,700	14,600	16,900
Cash received from option exercises and employee stock purchase plan			5,200	6,900	9,400
Tax benefit realized from stock options exercised			1,700	3,000	3,100
Capitalized share-based compensation cost			$ 400	$ 300	$ 400
2003 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance (in shares) \| shares			14,700,000
Increase in authorized shares (in shares) \| shares	1,700,000	3,500,000
2000 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance (in shares) \| shares			4,000,000.0
2001 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance (in shares) \| shares			4,000,000.0
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance (in shares) \| shares			3,000,000.0
Shares available for purchase (in shares) \| shares			2,000,000.0
Shares issued (in shares) \| shares			18,284	12,531	16,721
ESPP proceeds received			$ 1,100	$ 700	$ 700
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			4 years
Share-based compensation expense recognized			$ 3,200	3,000	2,600
Total unrecognized compensation costs related to unvested awards			$ 5,100
Weighted-average period for cost recognition, in years			2 years
Employee Stock Option \| Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			1 year
Employee Stock Option \| Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period, in years			8 years
Employee Stock Option \| Directors and Certain Executive Officers \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period, in years			6 years
Employee Stock Option \| Directors and Certain Executive Officers \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period, in years			10 years
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			3 years
Vested but not issued (in shares) \| shares			500,000
Restricted Stock, Performance Stock and Contract Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense recognized			$ 16,400	18,100	18,100
Total unrecognized compensation costs related to unvested awards			$ 22,600
Weighted-average period for cost recognition, in years			2 years
Fair value of shares vested			$ 17,300	$ 21,100	$ 24,800
Requisite service periods of performance stock, restricted stock and contract stock awards, in years			3 years
Performance Shares Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested but not issued (in shares) \| shares			100,000