Financing Arrangements (Tables)

9 Months Ended

Sep. 30, 2015

Debt Disclosure [Abstract]

Summary of Carrying Amounts of Debt

A summary of the carrying amounts of our debt is as follows:

	September 30, 2015		December 31, 2014
1.25% convertible senior notes due 2019	$	218,176	$	212,852
Senior secured credit facility	201,250		143,750
Total debt	419,426		356,602
Current maturities of debt	—		(28,750		)
Long-term debt, net of current portion	$	419,426	$	327,852

Schedule of Notes

As of September 30, 2015 and December 31, 2014, the Convertible Notes consisted of the following:

	September 30, 2015			December 31, 2014
Liability component:
Proceeds	$	250,000		$	250,000
Less: debt discount, net of amortization	(31,824		)	(37,148		)
Net carrying amount	$	218,176		$	212,852
Equity component(1)	$	39,287		$	39,287

(1) Included in Additional paid-in capital on the consolidated balance sheet.

Summary of Interest Expense Recognized

The following table presents the amount of interest expense recognized related to the Convertible Notes for the periods presented. 

	Three Months Ended September 30,				Nine Months Ended September 30,
	2015		2014		2015		2014
Contractual interest coupon	$	781	$	182	$	2,344	$	182
Amortization of debt issuance costs	295		68		883		68
Amortization of debt discount	1,795		406		5,324		406
Total interest expense	$	2,871	$	656	$	8,551	$	656