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Senior convertible notes (Tables)

12 Months Ended

Dec. 31, 2013

Summary of Senior Convertible Notes

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

		December 31,
		2012				2013
2013 notes
Principal amount		$	115,000			$	—
Unaccreted debt issuance cost			(557	)			—
Net carrying amount			114,443				—
2015 notes
Principal amount		$	100,000			$	100,000
Unaccreted debt issuance cost			(2,417	)			(1,561	)
Net carrying amount			97,583				98,439
Senior convertible notes		$	212,026			$	98,439

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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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