DEBT

3 Months Ended

Mar. 31, 2022

Debt Disclosure [Abstract]

DEBT

DEBT

Convertible Notes

As of March 31, 2022, the Company had outstanding fixed-rate notes with varying maturities for an undiscounted aggregate principal amount of $1.1 billion (collectively the Notes). The Notes are senior subordinated convertible obligations, and interest is payable in arrears, semi-annually. The following table summarizes information regarding the Company’s convertible debt:

	March 31, 2022		December 31, 2021
1.25% senior subordinated convertible notes due in May 2027 (the 2027 Notes)	$	600,000	$	600,000
Unamortized discount net of deferred offering costs	(10,465)		(10,971)
2027 Notes, net	589,535		589,029
0.599% senior subordinated convertible notes due in August 2024 (the 2024 Notes)	495,000		495,000
Unamortized discount net of deferred offering costs	(4,474)		(4,952)
2024 Notes, net	490,526		490,048
Total convertible debt, net	$	1,080,061	$	1,079,077
Fair value of fixed-rate convertible debt (1):
2027 Notes	$	604,758	$	625,122
2024 Notes	497,223		521,082
Total fair value of fixed-rate convertible debt	$	1,101,981	$	1,146,204

(1)    The fair value of the Company’s fixed-rate convertible debt is based on open-market trades and is classified as Level 1 in the fair value hierarchy. For additional discussion of fair value measurements, see Note 1 – Business Overview and Significant Accounting Policies included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2021.

Interest expense on the Company’s convertible debt consisted of the following: 

	Three Months Ended March 31,
	2022		2021
Coupon interest expense	$	2,616	$	2,616
Accretion of discount on convertible notes	836		834
Amortization of debt issuance costs	148		148
Total interest expense on convertible debt	$	3,600	$	3,598

See Note 10 - Debt included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2021 for additional information related to the Company’s convertible debt.

Revolving Credit Facility

In October 2018, the Company entered into an unsecured revolving credit facility of up to $200.0 million which includes a letter of credit subfacility and a swingline loan subfacility. The credit facility is intended to finance ongoing working capital needs and for other general corporate purposes. In May 2021, the Company entered into an amendment agreement in respect of the credit facility, extending the maturity date from October 19, 2021 to May 28, 2024, among other changes. The amended credit facility contains financial covenants including a maximum leverage ratio and a minimum interest coverage ratio. As of March 31, 2022, there were no amounts outstanding under the credit facility and the Company and certain of its subsidiaries that serve as guarantors were in compliance with all covenants.