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Debt (Tables)

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

Schedule of Debt

Total debt consists of the following:

	December 31,
	2017				2016
Convertible Senior Notes	$	230,000			$	230,000
Amended Credit Agreement	—				29,000
Total debt, principal amount	230,000				259,000
Debt issuance costs	(2,296		)		(3,709		)
Total debt, carrying value	$	227,704			$	255,291
Total short term debt, carrying value	$	—			$	29,000
Total long-term debt, carrying value	$	227,704			$	226,291

Schedule of Long-term Debt Instruments

Interest expense for the Company’s 2019 Notes related to the contractual interest coupon and contingent interest liability is noted below.

	Year ended December 31,
	2017				2016				2015
Contractual interest expense	$	1,725			$	1,725			$	1,725
Contingent interest expense	193				—				—
Total	$	1,918			$	1,725			$	1,725

Schedule of Line of Credit Facilities

Interest expense and commitment fees under the 2017 Credit Agreement and the Amended Credit Facility were as follows:

	Year ended December 31,
	2017				2016				2015
Commitment fees	$	519			$	415			$	332
Interest expense	35,351				877				—

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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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Tabular disclosure of short-term or long-term contractual arrangements with lenders, including letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line.

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