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DEBT (Details 3) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Amortization of debt discount			$ 4,362	$ 2,044
Capitalized interest (Note 4)	$ (200)	$ (400)	$ (400)	$ (700)
Effective interest rate on convertible senior notes	7.81%	7.22%	7.70%	7.22%
Two Thousand Nineteen Senior Convertible Notes [Member]
Contractual interest expense	$ 2,053	$ 963	$ 3,242	$ 1,926
Amortization of debt issuance costs	389	153	590	306
Amortization of debt discount	2,951	1,022	4,362	2,044
Capitalized interest (Note 4)	(167)	(405)	(379)	(675)
Total	$ 5,226	$ 1,733	$ 7,815	$ 3,601

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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.

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Amount of amortization expense attributable to debt issuance costs.

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The average effective interest rate during the reporting period.

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

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