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STOCK AWARD PLANS - Summary of Employee Stock Purchase Plan Activity (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares purchased by employees (shares)	48,991
Aggregate cost to employees	$ 3,484
Expense recognized by the company	26,570	$ 4,524	$ 44,704	$ 16,842
Company expense on ESPP discount
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expense recognized by the company	$ 615	$ 588	$ 1,535	$ 1,494

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- Definition

Total Employee cost of shares purchased during the period through the Employee Stock Purchase Plan.

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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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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 issued during the period as a result of an employee stock purchase plan.

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