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DEBT (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Interest Expense, Debt [Abstract]
Amortization of debt discount	$ 12,799	$ 10,423	$ 4,088
Interest Costs Capitalized	(689)	(1,101)	(1,491)
Notes
Interest Expense, Debt [Abstract]
Total interest expense recognized	21,949	18,047	7,061
Convertible Debt [Member]
Interest Expense, Debt [Abstract]
Contractual interest expense	8,205	7,344	3,852
Amortization of debt issuance costs	1,634	1,381	612
Amortization of debt discount	$ 12,799	$ 10,423	$ 4,088
Effective interest rate (as a percent)	7.81%	7.77%	7.22%

X

- Definition

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

+ References

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-Section 45
-Paragraph 28
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Amount of amortization expense attributable to debt issuance costs.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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