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STOCK AWARD PLANS - Summary of Employee Stock Purchase Plan Activity (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares purchased by employees (shares)	53,503
Aggregate cost to employees	$ 3,621,065
Expense recognized by the company	14,684,000	$ 26,570,000	$ 31,807,000	$ 44,704,000
Company expense on ESPP discount
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expense recognized by the company	$ 639,011	$ 615,000	$ 1,769,000	$ 1,535,000

X

- Definition

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

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

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

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