Convertible Senior Notes (Tables)

6 Months Ended

Jun. 30, 2018

Convertible senior notes consist of the following (in thousands):

	June 30, 2018						December 31, 2017
	Principal/		Debt				Principal/		Debt
	Fair Value		Issuance		Net		Fair Value		Issuance		Net
	Amount		Costs		Amount		Amount		Costs		Amount
3.25% convertible senior notes (due 2020) *	$	25,900	$	―	$	25,900	$	22,469	$	―	$	22,469
4.25% convertible senior notes (due 2018)		21,178		15		21,163		21,178		103		21,075
4.875% convertible senior notes (due 2020)		113,000		1,577		111,423		113,000		1,972		111,028
Total convertible senior notes, net of debt issuance costs	$	160,078	$	1,592	$	158,486	$	156,647	$	2,075	$	154,572

* The amount presented for the 3.25% 2020 convertible senior notes within the table represents the fair value as of June 30, 2018 and December 31, 2017 (see Note 16). The principal amount of these notes is $21.5 million.

- Definition

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.

+ References

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+ Details