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STOCK AWARD PLANS - Summary of Employee Stock Purchase Plan Activity (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares purchased by employees (shares)	38,538
Aggregate cost to employees	$ 3,208,000
Expense recognized by the company	23,771,000	$ 7,667,000	$ 68,475,000	$ 24,509,000
Company expense on ESPP discount
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expense recognized by the company	$ 566,101	$ 525,000	$ 2,101,000	$ 2,019,000

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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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