Long-term Debt Long-term Debt (Tables)

12 Months Ended

Dec. 31, 2015

Debt Disclosure [Abstract]

Convertible Debt

As of December 31, 2015, the liability and equity components of the Convertible Senior Notes consisted of the following (in thousands):

	Series A Notes			Series B Notes
Liability component:
Principal	$	460,000		$	460,000
Less: Convertible senior notes discounts and issuance costs, net of amortization	(93,469		)	(120,333		)
Net carrying amount	$	366,531		$	339,667
Equity component, net of issuance costs	$	92,567		$	117,834

Interest Income and Interest Expense Disclosure

Interest expense related to the Convertible Senior Notes consisted of the following for the year ended December 31, 2015 (in thousands):

	Series A Notes			Series B Notes
Coupon interest	$	2,683		$	4,361
Amortization of convertible senior notes discounts and issuance costs	10,833			9,236
Total interest expense recognized	$	13,516		$	13,597
Effective interest rate on the liability component	6.5		%	7.1		%