CAPITAL STOCK AND STOCK AWARD PLANS - Employee Stock Purchase Plan Activity (Details) - USD ($)	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expense Recognized by the Company	$ 43,995,000	$ 39,083,000	$ 87,791,000
Company expense on ESPP discount
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expense Recognized by the Company	$ 2,848,000	$ 2,840,000	$ 2,591,000
1997 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Purchased by Employees (in shares)	236,062	224,596	191,823
Aggregate Costs to Employees	$ 16,146,000	$ 16,093,000	$ 14,682,000
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	$ 2,848,000	$ 2,840,000	$ 2,591,000

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

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- Definition

Share based Compensation Arrangement by Share based Payment Award, Maximum Contribution Per Employee

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

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Discount rate from fair value on purchase date that participants pay for shares.

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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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