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DEBT | 12 Months Ended
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Dec. 31, 2021
Debt Disclosure [Abstract] |
DEBT | DEBT Convertible Notes As of December 31, 2021, 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:
| December 31,
| 2021 |  | 2020
1.25% senior subordinated convertible notes due in May 2027 (the 2027 Notes) | $ | 600,000 |  |  | $ | 600,000 |
Unamortized discount net of deferred offering costs | (10,971) |  |  | (12,995) |
2027 Notes, net | 589,029 |  |  | 587,005 |
0.599% senior subordinated convertible notes due in August 2024 (the 2024 Notes) | 495,000 |  |  | 495,000 |
Unamortized discount net of deferred offering costs | (4,952) |  |  | (6,860) |
2024 Notes, net | 490,048 |  |  | 488,140 |
Total convertible debt, net | $ | 1,079,077 |  |  | $ | 1,075,145 |
Fair value of fixed rate convertible debt (1): |  |  |
2027 Notes | $ | 625,122 |  |  | $ | 627,090 |
2024 Notes | 521,082 |  |  | 530,714 |
Total fair value of fixed rate convertible debt | $ | 1,146,204 |  |  | $ | 1,157,804 |
(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. See Note 1 to these Consolidated Financial Statements for additional discussion of fair value measurements. Interest expense on the Company’s convertible debt consisted of the following:
| Years Ended December 31,
| 2021 |  | 2020 |  | 2019
Coupon interest expense | $ | 10,465 |  |  | $ | 12,350 |  |  | $ | 4,907 |
Accretion of discount on convertible notes | 3,339 |  |  | 14,682 |  |  | 15,917 |
Amortization of debt issuance costs | 593 |  |  | 1,829 |  |  | 2,031 |
Total interest expense on convertible debt | $ | 14,397 |  |  | $ | 28,861 |  |  | $ | 22,855 |
2027 Notes In May 2020, the Company issued $600.0 million in aggregate principal amount of senior subordinated unsecured convertible notes with a maturity date of May 15, 2027. The 2027 Notes were issued to the public at par value and bear interest at the rate of 1.25% per annum. Interest is payable semi-annually in cash in arrears on May 15 and November 15 of each year, beginning November 15, 2020. The 2027 Notes are convertible, at the option of the holder into shares of the Company’s common stock. The initial conversion rate for the 2027 Notes is 7.2743 shares per $1,000 principal amount of the 2027 Notes, which represents a conversion price of approximately $137.47 per share, subject to adjustment under certain conditions. Following certain corporate transactions, the Company will, in certain circumstances, increase the conversion rate for a holder that elects to convert its 2027 Notes in connection with such corporate transactions by a number of additional shares of the Company’s common stock. A holder may convert fewer than all of such holder’s 2027 Notes so long as the amount of the 2027 Notes converted is an integral multiple of $1,000 principal amount. Net proceeds from the offering were $585.8 million. In connection with the issuance of the 2027 Notes, the Company recorded a discount on the 2027 Notes of $13.5 million, which will be accreted and recorded as additional interest expense over the life of the 2027 Notes. The 2027 Notes are senior subordinated, unsecured obligations, and rank (i) subordinated in right of payment to the prior payment in full of all of the Company’s existing and future senior debt, (ii) equal in right of payment with the Company’s existing and future senior subordinated debt, (iii) senior in right of payment to the Company’s existing and future indebtedness that is expressly subordinated in right of payment to the notes, (vi) effectively subordinated to the Company’s existing and future secured indebtedness, to the extent of the value of the collateral securing that indebtedness, and (v) structurally subordinated to all existing and future indebtedness and other liabilities, including trade payables, and (to the extent the Company is not a holder thereof) preferred equity, if any, of the Company’s subsidiaries. Upon the occurrence of a “fundamental change,” as defined in the indenture governing the 2027 Notes, the holders may require the Company to repurchase all or a portion of such holder’s 2027 Notes for cash at 100% of the principal amount of the 2027 Notes being purchased, plus any accrued and unpaid interest. The offer and sale of the 2027 Notes and the shares of the Company’s common stock issuable upon conversion of the 2027 Notes have not been registered under the Securities Act or any state securities laws and the 2027 Notes were offered only to qualified institutional buyers as defined in Rule 144A under the Securities Act. 2024 Notes In August 2017, the Company issued $495.0 million in aggregate principal amount of senior subordinated convertible notes with a maturity date of August 1, 2024. The 2024 Notes were issued to the public at 98% of face value and bear interest at the rate of 0.599% per annum. Interest is payable semi-annually in cash in arrears on February 1 and August 1 of each year, beginning February 1, 2018. The 2024 Notes are convertible, at the option of the holder into shares of the Company’s common stock. The initial conversion rate for the 2024 Notes is 8.0212 shares per $1,000 principal amount of the 2024 Notes, which represents a conversion price of approximately $124.67 per share, subject to adjustment under certain conditions. Following certain corporate transactions, the Company will, in certain circumstances, increase the conversion rate for a holder that elects to convert its 2024 Notes in connection with such corporate transactions by a number of additional shares of the Company’s common stock. A holder may convert fewer than all of such holder’s 2024 Notes so long as the amount of the 2024 Notes converted is an integral multiple of $1,000 principal amount. Net proceeds from the offering were $481.7 million. In connection with the issuance of the 2024 Notes, the Company recorded a discount on the 2024 Notes of $9.9 million, which will be accreted and recorded as additional interest expense over the life of the 2024 Notes. The 2024 Notes are senior subordinated, unsecured obligations, and rank (i) subordinated in right of payment to the prior payment in full of any of the Company’s existing and future senior debt, (ii) equal in right of payment to any of the Company’s existing and future senior subordinated debt, (iii) senior in right of payment to any of the Company’s existing and future indebtedness that is expressly subordinated in right of payment to the 2024 Notes, and (iv) effectively subordinated to any of the Company’s existing and future secured indebtedness, to the extent of the value of the collateral securing that indebtedness and structurally subordinated to all existing and future indebtedness and other liabilities, including trade payables, and (to the extent the Company is not a holder thereof) preferred equity, if any, of the Company’s subsidiaries. Upon the occurrence of a “fundamental change,” as defined in the indenture governing the 2024 Notes, the holders may require the Company to repurchase all or a portion of such holder’s 2024 Notes for cash at 100% of the principal amount of the 2024 Notes being purchased, plus any accrued and unpaid interest. See Note 16 to these Consolidated Financial Statements for further discussion of the effect of conversion of the Company's convertible debt on net income (loss) per common share. 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 December 31, 2021, 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.

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