Convertible 3.75% Senior Notes (Tables)

3 Months Ended

Mar. 31, 2017

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



	March 31, 2017			December 31, 2016
	(in thousands)
Face amount of the Notes	$	143,750		$	143,750
Unamortized discount	(27,103		)	(29,160		)
Debt issuance costs	$	(2,975	)	$	(3,199	)
Carrying amount of the Notes	$	113,672		$	111,391

Interest Income and Interest Expense Disclosure

For the three months ended March 31, 2017 and 2016, the Company recorded the following expenses in relation to the Notes:



	Three months ended March 31,
	2017		2016
	(in thousands)
Interest Expense at 3.75% coupon rate	$	1,348	$	1,347
Debt discount amortization	2,057		1,809
Amortization of deferred financing costs	224		197
Total interest expense (1)	$	3,629	$	3,353

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