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Convertible debt (Tables)

6 Months Ended

Jun. 30, 2015

Debt Disclosure [Abstract]

Convertible Debt [Table Text Block]

The Senior Notes consist of the following (in thousands):

	June 30, 2015				December 31, 2014
Liability component:
Principal	$	143,750			$	143,750
Less: debt discount, net of amortization	(30,389		)		(33,302		)
Net carrying amount	$	113,361			$	110,448
Equity component (1)	$	28,714			$	28,714

(1) Recorded in the consolidated balance sheet within additional paid-in capital, net of $1.2 million issuance cost in equity.

The following table sets forth total interest expense recognized related to the Senior Notes (in thousands):

		Three Months Ended June 30, 2015				Six Months Ended June 30, 2015
2.0% coupon		$	719			$	1,438
Amortization of debt issuance costs		198				393
Amortization of debt discount		1,306				2,577
Total		$	2,223			$	4,408

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- Definition

Tabular disclosure of borrowings which can be exchanged for a specified number of another security at the option of the issuer or the holder. Disclosures include, but are not limited to, principal amount, amortized premium or discount, and amount of liability and equity components.

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