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

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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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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Number of shares issued under share-based payment arrangement.

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Percentage of vesting of award under share-based payment arrangement.

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EQUITY PLANS (Details)	3 Months Ended		6 Months Ended
EQUITY PLANS (Details)	Jun. 30, 2020 USD ($) shares	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) plan shares	Jun. 30, 2019 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of incentive plans \| plan			2
Share based compensation expense \| $			$ 2,100,000	$ 1,600,000
Share based income tax benefit (expense) \| $	$ 800,000	$ 400,000	$ 2,900,000	$ 500,000
Restricted Stock Units (RSUs) \| Share-based Payment Arrangement, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			33.00%
Restricted Stock Units (RSUs) \| Share-based Payment Arrangement, Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			33.00%
Restricted Stock Units (RSUs) \| Share-based Payment Arrangement, Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			33.00%
2010 Option Plan \| Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock available to acquire (in shares)	2,455,368		2,455,368
2015 Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock available to acquire (in shares)	1,700,000		1,700,000
Restricted stock units issued in period (in shares)			483,860
Shares available for grant (in shares)	691,356		691,356