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FINANCIAL INSTRUMENTS - Fair Value of Liabilities Measured on a Recurring Basis (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions	9 Months Ended
	Sep. 30, 2021	Jul. 31, 2020	Mar. 31, 2017
Reported Value Measurement
Financial Assets:
Notes receivable	$ 4,164
Financial Liabilities:
Acquisition-related contingent consideration	16,199
Reported Value Measurement | Convertible Senior Notes Due 2022
Financial Liabilities:
Convertible senior notes	155,751
Reported Value Measurement | Convertible Senior Notes Due 2025
Financial Liabilities:
Convertible senior notes	326,146
Estimate of Fair Value Measurement | Level 1
Financial Assets:
Notes receivable	0
Financial Liabilities:
Acquisition-related contingent consideration	0
Estimate of Fair Value Measurement | Level 1 | Convertible Senior Notes Due 2022
Financial Liabilities:
Convertible senior notes	0
Estimate of Fair Value Measurement | Level 1 | Convertible Senior Notes Due 2025
Financial Liabilities:
Convertible senior notes	0
Estimate of Fair Value Measurement | Level 2
Financial Assets:
Notes receivable	0
Financial Liabilities:
Acquisition-related contingent consideration	0
Estimate of Fair Value Measurement | Level 2 | Convertible Senior Notes Due 2022
Financial Liabilities:
Convertible senior notes	166,000
Estimate of Fair Value Measurement | Level 2 | Convertible Senior Notes Due 2025
Financial Liabilities:
Convertible senior notes	437,216
Estimate of Fair Value Measurement | Level 3
Financial Assets:
Notes receivable	4,164
Financial Liabilities:
Acquisition-related contingent consideration	16,199
Estimate of Fair Value Measurement | Level 3 | Convertible Senior Notes Due 2022
Financial Liabilities:
Convertible senior notes	0
Estimate of Fair Value Measurement | Level 3 | Convertible Senior Notes Due 2025
Financial Liabilities:
Convertible senior notes	$ 0
Closing sale price (in dollars per share)	$ 56.00
Convertible Senior Notes Due 2022
Financial Liabilities:
Closing sale price (in dollars per share)			$ 48.65
Initial conversion price of notes into common stock (in dollars per share)			$ 66.89
Convertible Senior Notes Due 2022 | Maximum
Financial Liabilities:
Debt instrument, convertible, conversion premium (in shares)	2.4
Convertible Senior Notes Due 2022 | Unsecured Debt
Financial Liabilities:
Stated interest rate (as a percent)	2.375%	2.375%	2.375%
Convertible Senior Notes Due 2025
Financial Liabilities:
Closing sale price (in dollars per share)		$ 54.17
Initial conversion price of notes into common stock (in dollars per share)		$ 71.78	$ 71.78
Convertible Senior Notes Due 2025 | Maximum
Financial Liabilities:
Debt instrument, convertible, conversion premium (in shares)	5.6
Convertible Senior Notes Due 2025 | Unsecured Debt
Financial Liabilities:
Stated interest rate (as a percent)	0.75%	0.75%

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