Debt (Tables)

6 Months Ended

Jun. 30, 2015

The Company's 1.00% convertible senior notes (the "Notes"), issued in August 2013, consisted of the following components as of June 30, 2015 and December 31, 2014 (in thousands):



	June 30, 2015			December 31, 2014
Equity component, net of equity issue costs	$	60,222		$	60,222
Liability component:
Principal	287,500			287,500
Less: unamortized debt discount	(40,752		)	(46,614		)
Net carrying amount	$	246,748		$	240,886

Interest expense related to convertible senior notes

The following table sets forth total interest expense recognized related to the Notes for the three and six months ended June 30, 2015 and 2014 (in thousands except percentages):



	Three Months Ended June 30,						Six Months Ended June 30,
	2015			2014			2015			2014
Contractual interest expense	$	719		$	719		$	1,438		$	1,430
Amortization of debt issuance costs	320			320			639			639
Amortization of debt discount	2,953			2,782			5,862			5,523
Total	$	3,992		$	3,821		$	7,939		$	7,592

Effective interest rate	6.5		%	6.5		%	6.5		%	6.5		%