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Senior convertible notes (Tables)

3 Months Ended

Mar. 31, 2013

Summary of Senior Convertible Notes

Senior convertible notes consist of the following (in thousands):

		March 31 2013				December 31 2012
2013 notes
Principal amount		$	115,000			$	115,000
Unaccreted debt issuance expense			(407	)			(557	)
Net carrying amount			114,593				114,443
2015 notes
Principal amount		$	100,000			$	100,000
Unaccreted debt issuance expense			(2,209	)			(2,417	)
Net carrying amount			97,791				97,583
Senior convertible notes		$	212,384			$	212,026

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- 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.

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