Debt (Tables)

12 Months Ended

Dec. 31, 2015

Schedule of outstanding debt obligations

Our outstanding debt obligations as of December 31, 2015 and December 31, 2014 consisted of the following (in thousands):

	December 31,
	2015		2014
2023 Senior Notes	$	490,335	$	—
2015 Term Loan Facility		338,415		—
2.5% Convertible Notes		174,390		167,441
2014 Term Loan Facility		—		327,905
Total long-term debt		1,003,140		495,346
Less: current maturities		17,500		34,000
Long-term debt, net of current maturities	$	985,640	$	461,346

Schedule of total interest expense recognized related to the Convertible Notes

The following table sets forth total interest expense recognized related to the Convertible Notes during the years ended December 31, 2015 and December 31, 2014 (in thousands):

	Years Ended December 31,
	2015		2014
Contractual interest expense	$	5,000	$	4,375
Amortization of debt issuance costs		985		800
Amortization of debt discount		6,927		5,629
Total interest expense	$	12,912	$	10,804

Schedule of Future annual principal payments on long-term debt

Year Ending December 31, 2016	$	17,500
Year Ending December 31, 2017		17,500
Year Ending December 31, 2018		17,500
Year Ending December 31, 2019		217,500
Year Ending December 31, 2020		17,500
Thereafter		758,125
Total	$	1,045,625

Convertible 2.5% notes

Schedule of outstanding debt obligations

Our outstanding Convertible Note balances as December 31, 2015 consisted of the following (in thousands):

	December 31, 2015
Liability component:
Principal	$	200,000
Less: debt discount, net		(25,610)
Net carrying amount	$	174,390
Equity component	$	38,188