CAPITAL STOCK AND STOCK AWARD PLANS - Summary of Employee Stock Purchase Plan Activity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expense Recognized by the Company	$ 39,083,000	$ 87,791,000	$ 41,805,000
Company Expense on ESPP discount
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expense Recognized by the Company	$ 2,840,000	$ 2,591,000	$ 2,479,000
1997 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Purchased by Employees (in shares)	224,596	191,823	215,613
Aggregate Costs to Employees	$ 16,093,000	$ 14,682,000	$ 14,048,000
Maximum employee contribution to purchase company stock	$ 10,000
Discount rate used to determine purchase price (percent)	15.00%
1997 Employee Stock Purchase Plan | Company Expense on ESPP discount
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expense Recognized by the Company	$ 2,840,000	$ 2,591,000	$ 2,479,000