Adjustments To Additional Paid In Capital, Issuance Of Capped Calls

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Debt Instrument, Convertible, Covenant Noncompliance, Period Of Additional Interest

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Debt Instrument, Convertible, Liability Component, Discount Rate

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Debt Instrument, Convertible, Percentage Of Holders To Require Written Notice Of Noncompliance

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Debt Instrument, Convertible, Threshold Principal Outstanding Amount For Partial Redemption

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Debt Instrument, Covenant, Billing Covenant

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Debt Instrument, Covenant, Billing Covenant Period

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Debt Instrument, Covenant, Cast To Funded Senior Debt Ratio

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Debt Instrument, Covenant, Minimum Cash Plus Liquidity Requirement

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Debt Instrument, Required Compliance Period, Period After Written Notice

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Line Of Credit Facility, Maximum Borrowing Capacity, Percentage Of Eligible Accounts Receivable

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Option Indexed to Issuer's Equity, Cap Price

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Description of a feature that permits the issuer of the debt to repay or convert it before the stated maturity date (early retirement date). The description may include such items as the call price, the period that the issuer can call the debt, including the earliest call date, and other significant terms of the call feature, which may include the debt holders' ability to convert the debt to equity if the call option is exercised and contingent events that trigger the issuer's ability to call the debt.

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The price per share of the conversion feature embedded in the debt instrument.

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Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instrument must exceed threshold percentage for specified number of trading days to trigger conversion feature.

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Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion.

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Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature.

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Face (par) amount of debt instrument at time of issuance.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Exercise or strike price stated in the contract for options indexed to the issuer's equity shares.

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The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

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DEBT - Narrative (Details)			3 Months Ended	6 Months Ended
DEBT - Narrative (Details)	Nov. 30, 2020 USD ($)	Sep. 22, 2020 USD ($) numberOfDays $ / shares	Jun. 30, 2021 USD ($)	Jun. 30, 2021 USD ($) numberOfDays	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Debt instrument, face amount			$ 230,000,000.0	$ 230,000,000.0
Debt Instrument, Interest Rate, Stated Percentage			1.00%	1.00%
Proceeds from Convertible Debt		$ 222,700,000
Debt Instrument, Call Feature			26.5 million
Debt Instrument, Convertible, Threshold Consecutive Trading Days \| numberOfDays				10,000
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger				98.00%
Debt Instrument, Convertible, Conversion Ratio		11.7457
Debt Instrument, Convertible, Conversion Price \| $ / shares		$ 85,140
Debt Instrument, Convertible, Redemption Period, Days Before Maturity Date				36 days
Debt Instrument, Redemption Price, Percentage		100.00%
Debt Instrument, Convertible, Threshold Principal Outstanding Amount For Partial Redemption			$ 75,000,000.0	$ 75,000,000.0
Debt Instrument, Required Compliance Period, Period After Written Notice				60 days
Debt Instrument, Convertible, Percentage Of Holders To Require Written Notice Of Noncompliance				25.00%
Debt Instrument, Convertible, Redemption Requirement, Amount Of Other Debt Called Due			35,000,000	$ 35,000,000
Debt Instrument, Convertible, Covenant Noncompliance, Period Of Additional Interest				365 days
Debt Instrument, Convertible, Liability Component, Discount Rate				6.50%
Adjustments To Additional Paid In Capital, Issuance Of Capped Calls		$ 26,500,000
Option Indexed to Issuer's Equity, Strike Price \| $ / shares		$ 85.14
Option Indexed to Issuer's Equity, Cap Price \| $ / shares		$ 128.51
Long-term Line of Credit, Noncurrent			0	$ 0
Debt Instrument, Unused Borrowing Capacity, Amount			$ 50,000,000.0	$ 50,000,000.0
Maximum borrowing capacity, percentage of accounts receivable			85.00%	85.00%
Debt Covenant Noncompliance, Scenario One
Debt Instrument [Line Items]
Debt Instrument, Convertible, Covenant Noncompliance, Period Of Additional Interest				180 years
Debt Instrument, Convertible, Covenant Noncompliance, Additional Interest, Stated Percentage			0.25%	0.25%
Debt Covenant Noncompliance, Scenario Two
Debt Instrument [Line Items]
Debt Instrument, Convertible, Covenant Noncompliance, Additional Interest, Stated Percentage			0.50%	0.50%
Debt Covenant Noncompliance, Scenario Two \| Minimum
Debt Instrument [Line Items]
Debt Instrument, Convertible, Covenant Noncompliance, Period Of Additional Interest				181 days
Debt Covenant Noncompliance, Scenario Two \| Maximum
Debt Instrument [Line Items]
Debt Instrument, Convertible, Covenant Noncompliance, Period Of Additional Interest				365 days
Debt Conversion Scenario One
Debt Instrument [Line Items]
Debt Instrument, Convertible, Threshold Trading Days \| numberOfDays		20,000
Debt Instrument, Convertible, Threshold Consecutive Trading Days \| numberOfDays		30,000
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger		130.00%
Debt Conversion Scenario Two
Debt Instrument [Line Items]
Debt Instrument, Convertible, Threshold Trading Days \| numberOfDays				5,000
Debt Conversion Scenario Three
Debt Instrument [Line Items]
Debt Instrument, Convertible, Threshold Trading Days \| numberOfDays				20
Debt Instrument, Convertible, Threshold Consecutive Trading Days \| numberOfDays				30
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger				130.00%
Convertible Senior Notes, Additional Principal Option
Debt Instrument [Line Items]
Debt instrument, face amount			$ 30,000,000.0	$ 30,000,000.0
Lines of credit
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 50,000,000.0	$ 50,000,000.0
Debt instrument, interest rate			2.75%	2.75%
Commitment fee percentage				0.15%
Lines of credit \| Loan Facility, Threshold Two [Member] \| Prime Rate
Debt Instrument [Line Items]
Basis spread on variable rate				0.50%
Revolving Credit Facility \| Lines of credit
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 40,000,000.0				$ 50,000,000.0
Debt Instrument, Covenant, Billing Covenant Period	12 months
Debt Instrument, Covenant, Minimum Cash Plus Liquidity Requirement	$ 5,000,000.0
Debt Instrument, Covenant, Cast To Funded Senior Debt Ratio			1.25	1.25
Debt Instrument, Unused Borrowing Capacity, Amount			$ 50,000,000.0	$ 50,000,000.0
Revolving Credit Facility \| Lines of credit \| Minimum
Debt Instrument [Line Items]
Debt Instrument, Covenant, Billing Covenant	210,000,000.0
Revolving Credit Facility \| Lines of credit \| Maximum
Debt Instrument [Line Items]
Debt Instrument, Covenant, Billing Covenant	$ 255,000,000.0