Debt Tables (Tables)

12 Months Ended

Dec. 31, 2014

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments

The following table summarizes information about the equity and liability components of the Convertible Senior Notes (dollars in thousands). The fair values of the respective notes outstanding were measured based on quoted market prices.

	December 31, 2014
Principal amount of convertible notes outstanding	$	172,500
Unamortized discount of liability component	(30,403		)
Net carrying amount of liability component	142,097
Less: current portion	—
Long-term debt	$	142,097
Carrying value of equity component, net of issuance costs	$	29,758
Fair value of outstanding convertible senior notes	142,097
Remaining amortization period of discount on the liability component	6 years