Convertible Senior Notes (Tables)

9 Months Ended

Sep. 30, 2016

Convertible Senior Notes, Net of Issuance Costs

Convertible senior notes, net of debt issuance costs consist of the following (in thousands):

	December 31, 2015						September 30, 2016
			Debt						Debt
	Principal		Issuance		Net		Principal		Issuance		Net
	Amount		Costs		Amount		Amount		Costs		Amount
4.25% convertible senior notes (due 2018)	$	100,000	$	2,181	$	97,819	$	99,305	$	1,461	$	97,844
4.875% convertible senior notes (due 2020)		115,000		3,653		111,347		113,000		2,911		110,089
Total convertible senior notes, net of debt issuance costs	$	215,000	$	5,834	$	209,166	$	212,305	$	4,372	$	207,933