CONVERTIBLE SENIOR NOTES (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended	6 Months Ended
	Sep. 25, 2020	Jun. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Interest expense		$ 726	$ 1,450
Accounting Standards Update 2020-06 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Debt Instrument [Line Items]
Effective interest				0.47%
Increase of retained earnings				$ 2,884
Decrease in additional paid-in capital				36,336
Increase in convertible senior notes				45,282
Decrease in deferred tax liabilities				$ 11,830
Convertible Senior Notes due 2025 [Member]
Debt Instrument [Line Items]
Debt conversion description			On September 25, 2020, the Company sold $632,500 aggregate principal amount of its 0.00% convertible senior notes due 2025 (the “Notes”). The Notes were sold pursuant to an indenture, dated September 25, 2020 (the “Indenture”), between the Company and U.S. Bank National Association, as trustee (the “Trustee”). The Notes do not bear regular interest and mature on September 15, 2025, unless earlier repurchased or converted in accordance with their terms. The Notes are general senior unsecured obligations of the Company. Holders may convert their Notes prior to the close of business on the business day immediately preceding June 15, 2025 in multiples of $1,000 principal amount, only under the following circumstances: (1) during any calendar quarter commencing after the calendar quarter ending on December 31, 2020 (and only during such calendar quarter), if the last reported sale price of the common stock for at least 20 trading days (whether or not consecutive) during the period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price on each applicable trading day; (2) during the five-business-day period after any five consecutive trading day period in which the trading price per $1,000 principal amount of the Notes for each trading day of that five consecutive trading day period was less than 98% of the product of the last reported sale price of the common stock and the conversion rate on each such trading day; or (3) upon the occurrence of specified corporate events as described in the Indenture. In addition, holders may convert their Notes, in multiples of $1,000 principal amount, at their option at any time beginning on or after June 15, 2025, and prior to the close of business on the second scheduled trading day immediately preceding the stated maturity date of the Notes, without regard to the foregoing circumstances. The initial conversion rate for the Notes was 3.5997 shares of common stock per $1,000 principal amount of Notes, which is equivalent to an initial conversion price of approximately $277.80 per share of common stock, subject to adjustment upon the occurrence of certain specified events as set forth in the Indenture.
Principal amount sold	$ 632,500
Effective coupon rate	0.00%
Maturity date	Sep. 15, 2025
Conversion amount	$ 1,000
Conversion rate	$ 3.5997
Amount of conversion	$ 1,000
Conversion price	$ 277.80
Amortized period			4 years 2 months 12 days
Amount by which the if-converted value of the Notes exceeded the principal amount		169,131	$ 169,131
Senior Notes [Member] | Level 2 [Member]
Debt Instrument [Line Items]
Estimated fair value of notes		$ 801,631	$ 801,631