CONVERTIBLE SENIOR NOTES (Schedule of Convertible Senior Notes) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Liability:
Net carrying amount	$ 620,082	$ 573,350
Convertible Senior Notes [Member]
Liability:
Principal	632,500	632,500
Unamortized debt discount		(46,353)
Unamortized issuance costs	(12,418)	(12,797)
Net carrying amount	620,082	573,350
Equity component:
Amount allocated to conversion option		48,834
Deferred taxes liability, net		(11,368)
Allocated issuance costs		(1,130)
Equity component, net		$ 36,336

Amount allocated to conversion option.

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Deferred taxes.

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Carrying amount of long-term convertible debt as of the balance sheet date, net of the amount due in the next twelve months or greater than the normal operating cycle, if longer. The debt is convertible into another form of financial instrument, typically the entity's common stock.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

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Amount, after accumulated amortization, of debt discount.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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