Long-Term Debt (Tables)

3 Months Ended

Mar. 31, 2017

Debt Disclosure [Abstract]

Notes Payable

Total convertible notes payable consisted of the following at (in thousands):

	March 31,		December 31,
	2017		2016
Principal amount of Notes	$	325,000	$	325,000
Unamortized debt issuance costs		(8,305)		(8,661)
Total convertible notes payable	$	316,695	$	316,339

Interest Expense

Interest expense incurred in connection with the Notes consisted of the following (in thousands):

	Three Months Ended
	March 31,
	2017		2016
Coupon interest	$	3,047	$	2,099
Amortization of debt issuance costs		356		237
Total interest expense on Notes	$	3,403	$	2,336