Convertible 3.75% Senior Notes (Tables)

9 Months Ended

Sep. 30, 2017

Debt Disclosure [Abstract]

Convertible Debt

At September 30, 2017 and December 31, 2016, the net carrying amount of the Notes and the remaining unamortized debt discount were as follows:

	September 30, 2017			December 31, 2016
	(in thousands)
Face amount of the Notes	$	143,750		$	143,750
Unamortized discount	(22,784		)	(29,160		)
Debt issuance costs	$	(2,503	)	$	(3,199	)
Carrying amount of the Notes	$	118,463		$	111,391

Interest Income and Interest Expense Disclosure

For the three and the nine months ended September 30, 2017 and 2016, the Company recorded the following expenses in relation to the Notes:

	Three months ended  September 30,				Nine months ended  September 30,
	2017		2016		2017		2016
	(in thousands)
Interest Expense at 3.75% coupon rate	$	1,348	$	1,348	$	4,043	$	4,043
Debt discount amortization	2,193		1,929		6,376		5,606
Amortization of deferred financing costs	239		210		695		611
Total interest expense (1)	$	3,780	$	3,487	$	11,114	$	10,260

(1) Included within "Interest and other expense, net" on the Condensed Consolidated Statements of Operations, offset by interest income and capitalized interest