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STOCK AWARD PLANS - Total Compensation Expense Recognized (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 29,161	$ 10,954	$ 53,150	$ 22,351
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	4,027	5,025	7,994	10,038
Stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	24,401	5,291	43,349	10,694
Company expense on ESPP discount
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 733	$ 638	$ 1,807	$ 1,619

X

- Definition

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

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