WARRANTY OBLIGATIONS (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Changes in the Company's product warranty liability
Balance, at beginning of year	$ 78,811	$ 58,375	$ 51,192
Additions and adjustments to cost of revenues	70,854	34,650	13,749
Usage and current warranty expenses	(27,839)	(14,214)	(6,566)
Balance, at end of year	121,826	78,811	58,375
Less current portion	(28,868)	(14,785)	(13,616)
Long term portion	$ 92,958	$ 64,026	$ 44,759

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

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- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred through that date and due after one year (or beyond the operating cycle if longer) for estimated claims under standard and extended warranty protection rights granted to customers.

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Amount of decrease in the standard and extended product warranty accrual from payments made in cash or in kind to satisfy claims under the terms of the standard and extended product warranty.

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Amount of increase in the standard and extended product warranty accrual from warranties issued.

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