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STOCK-BASED COMPENSATION - Summary of Common Stock Option Activity (Details) $ / shares in Units, $ in Thousands		9 Months Ended
	Jan. 01, 2019 shares	Sep. 30, 2020 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value | $		$ 30,321
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number		595,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price | $ / shares		$ 24.32
Award vesting period		4 years
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized	1,327,352
Shares (in thousands)
Beginning balance (in shares)		1,000,000
Granted (in shares)		0
Exercised (in shares)		(324,000)
Forfeited (in shares)		(17,000)
Canceled (in shares)		(1,000)
Ending balance (in shares)		658,000
Weighted-Average Exercise Price
Beginning balance (in usd per share) | $ / shares		$ 22.99
Granted (in usd per share) | $ / shares		0
Exercised (in usd per share) | $ / shares		19.66
Forfeited (in usd per share) | $ / shares		28.10
Canceled (in usd per share) | $ / shares		20.67
Ending balance (in usd per share) | $ / shares		$ 24.49
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value | $		$ 27,516
Common stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term		5 years 10 months 17 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term		5 years 9 months 14 days

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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