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Debt (Tables)

6 Months Ended

Jun. 30, 2018

Debt

Schedule of components of convertible notes

The components of the convertible notes are as follows (in thousands):

						Carrying Amount,
		Interest Rates				June 30,			December 31,
Debt		June 30, 2018		Maturities		2018			2017
0.375% Convertible Senior Notes due 2018		0.375	%	2018		$	7,554			7,393
1.25% Convertible Senior Notes due 2020		1.25	%	2020			17,016			16,608
							24,570			24,001
Less current portion							7,554			7,393
						$	17,016		$	16,608

Schedule of carrying amount and fair value of convertible notes

The carrying amount and fair value of our convertible notes are as follows (in thousands):

		June 30, 2018						December 31, 2017
		Carrying						Carrying
		Amount			Fair Value			Amount			Fair Value
0.375% Convertible Senior Notes due 2018		$	7,554		$	10,137		$	7,393		$	14,129
1.25% Convertible Senior Notes due 2020			17,016			26,138			16,608			35,431
		$	24,570		$	36,275		$	24,001		$	49,560

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Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements.

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Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

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