BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Fair Value, Assets and Liabilities Measured on Nonrecurring Basis, Valuation Techniques (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Sep. 17, 2019
Contingent consideration	$ 12,300	$ 6,900
7.50% Senior Notes due 2027 \| Senior Notes
Stated interest rate			7.50%
4.75% senior notes due 2029
Stated interest rate	0.0475%
4.75% senior notes due 2029 \| Senior Notes
Stated interest rate	4.75%
1.75% convertible notes due 2028
Stated interest rate	0.0175%
1.75% convertible notes due 2028 \| Senior Notes
Stated interest rate	1.75%
1.75% convertible notes due 2028 \| Convertible Debt
Stated interest rate	1.75%
1.00% convertible notes due 2023 \| Convertible Debt
Stated interest rate	1.00%
Level 1
Cash equivalents	$ 118,400	0
Term loan due 2026	0	0
Revolver due 2026	0	0
Interest rate swaps	0	0
Contingent consideration	0	0
Level 1 \| 7.50% Senior Notes due 2027
Senior Notes	0	0
Level 1 \| 4.75% senior notes due 2029
Senior Notes	0	0
Level 1 \| 1.75% convertible notes due 2028
Convertible Note	0	0
Level 1 \| 1.00% convertible notes due 2023
Convertible Note	0	0
Level 2
Cash equivalents	0	0
Term loan due 2026	144,400	92,500
Revolver due 2026	135,000	275,000
Interest rate swaps	1,000	6,600
Contingent consideration	0	0
Level 2 \| 7.50% Senior Notes due 2027
Senior Notes	319,500	329,000
Level 2 \| 4.75% senior notes due 2029
Senior Notes	350,600	0
Level 2 \| 1.75% convertible notes due 2028
Convertible Note	269,800	0
Level 2 \| 1.00% convertible notes due 2023
Convertible Note	194,100	180,000
Level 3
Cash equivalents	0	0
Term loan due 2026	0	0
Revolver due 2026	0	0
Interest rate swaps	0	0
Contingent consideration	12,300	6,900
Level 3 \| 7.50% Senior Notes due 2027
Senior Notes	0	0
Level 3 \| 4.75% senior notes due 2029
Senior Notes	0	0
Level 3 \| 1.75% convertible notes due 2028
Convertible Note	0	0
Level 3 \| 1.00% convertible notes due 2023
Convertible Note	$ 0	$ 0

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Amount of liability recognized arising from contingent consideration in a business combination.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Carrying value as of the balance sheet date of portion of long-term loans payable due within one year or the operating cycle if longer.

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