In April 2020, we entered into a purchase agreement for the sale of an aggregate of $1.0 billion principal amount of senior convertible notes (the “2025 Notes”) in a private offering to qualified institutional buyers pursuant to Rule 144A under the Securities Act of 1933, as amended (the “Securities Act”). The 2025 Notes consisted of an $850.0 million initial placement and an over-allotment option that provided the initial purchasers of the 2025 Notes with the option to purchase an additional $150.0 million aggregate principal amount of the 2025 Notes, which was fully exercised. The 2025 Notes were issued pursuant to an Indenture, dated April 28, 2020 (the “Indenture”). The net proceeds from the issuance of the 2025 Notes were $888.6 million, net of debt issuance costs and cash used to purchase the capped call transactions (“2025 Capped Call Transactions”) discussed below.

The 2025 Notes are unsecured and unsubordinated obligations. Interest is payable in cash semi-annually in arrears beginning on November 1, 2020 at a rate of 0.25% per year. The 2025 Notes mature on May 1, 2025 unless repurchased, redeemed, or converted in accordance with the terms prior to such date.

The 2025 Notes are convertible into cash, shares of our Class A common stock, or a combination of cash and shares of our Class A common stock, at our election, at an initial conversion rate of 46.1233 shares of Class A common stock per $1,000 principal amount of 2025 Notes, which is equivalent to an initial conversion price of approximately $21.68 (the “2025 Conversion Price”) per share of our Class A common stock. The conversion rate is subject to customary adjustments for certain events as described in the Indenture.

We may redeem for cash all or any portion of the 2025 Notes, at our option, on or after May 6, 2023 if the last reported sale price of our Class A common stock has been at least 130% of the 2025 Conversion Price then in effect for at least 20 trading days at a redemption price equal to 100% of the principal amount of the 2025 Notes to be redeemed, plus accrued and unpaid interest.

Holders of the 2025 Notes may convert all or a portion of their 2025 Notes at their option prior to February 1, 2025, in multiples of $1,000 principal amounts, only under the following circumstances:

On or after February 1, 2025, the 2025 Notes are convertible at any time until the close of business on the second scheduled trading day immediately preceding the maturity date.

Holders of the 2025 Notes who convert in connection with a make-whole fundamental change, as defined in the Indenture, or in connection with a redemption are entitled to an increase in the conversion rate. Additionally, in the event of a fundamental change, holders of the 2025 Notes may require us to repurchase all or a portion of the 2025 Notes at a price equal to 100% of the principal amount of 2025 Notes, plus any accrued and unpaid interest, including any additional interest.

In accounting for the issuance of the 2025 Notes, we separated the 2025 Notes into liability and equity components. The carrying amount of the equity component was $289.9 million and was recorded as a debt discount, which is amortized to interest expense at an effective interest rate of 7.39%. We allocated $3.3 million of debt issuance costs to the equity component and the remaining debt issuance costs of $8.1 million were allocated to the liability component, which are amortized to interest expense under the effective interest rate method. The equity component of the 2025 Notes will not be remeasured as long as it continues to meet the conditions for equity classification.

In August 2019, we entered into a purchase agreement for the sale of an aggregate of $1.265 billion principal amount of senior convertible notes (the “2026 Notes”) in a private offering to qualified institutional buyers pursuant to Rule 144A under the Securities Act. The net proceeds from the issuance of the 2026 Notes were $1.15 billion, net of debt issuance costs and cash used to purchase the capped call transactions (“2026 Capped Call Transactions”) discussed below.

The 2026 Notes are unsecured and unsubordinated obligations. Interest is payable in cash semi-annually in arrears beginning on February 1, 2020 at a rate of 0.75% per year. The 2026 Notes mature on August 1, 2026 unless repurchased, redeemed, or converted in accordance with the terms prior to such date.

The 2026 Notes are convertible into cash, shares of our Class A common stock, or a combination of cash and shares of our Class A common stock, at our election, at an initial conversion rate of 43.8481 shares of Class A common stock per $1,000 principal amount of 2026 Notes, which is equivalent to an initial conversion price of approximately $22.81 (the “2026 Conversion Price”) per share of our Class A common stock. Refer to the Company’s consolidated financial statements and Note 7 in the Annual Report for additional details.

	As of June 30, 2020						As of December 31, 2019
	2025 Notes			2026 Notes			2026 Notes
	(in thousands)
Liability:
Principal	$	1,000,000		$	1,265,000		$	1,265,000
Unamortized debt discount and issuance costs		(289,341	)		(349,917	)		(373,224	)
Net carrying amount	$	710,659		$	915,083		$	891,776
Carrying amount of the equity component	$	286,589		$	377,432		$	377,432

As of June 30, 2020, the debt discount and debt issuance costs on the 2025 Notes and 2026 Notes will be amortized over the remaining period of approximately 4.8 years and 6.1 years, respectively.

Interest expense related to the amortization of debt discount and issuance costs was $20.4 million and $32.0 million for the three and six months ended June 30, 2020, respectively, while contractual interest expense was $2.8 million and $5.2 million for the three and six months ended June 30, 2020, respectively. We did not enter into the Convertible Notes until the third quarter of 2019 and therefore recorded no related interest prior to such quarter.

As of June 30, 2020, the if-converted value of the 2025 Notes and 2026 Notes exceeded the principal amount by $83.4 million and $37.9 million, respectively. As of June 30, 2020, no Convertible Notes were eligible for conversion.

In connection with the pricing of the 2025 Notes and 2026 Notes, we entered into 2025 Capped Call Transactions and 2026 Capped Call Transactions (together, the “Capped Call Transactions”), respectively, with certain counterparties at a net cost of $100.0 million and $102.1 million, respectively. The cap price of the 2025 Capped Call Transactions is initially $32.12 per share of our Class A common stock and the cap price of the 2026 Capped Call Transaction was $32.58 per share of our Class A common stock. Both are subject to certain adjustments under the terms of the Capped Call Transactions. Conditions that cause adjustments to the initial strike price of the Capped Call Transactions mirror conditions that result in corresponding adjustments for the Convertible Notes.

The Capped Call Transactions are intended to reduce potential dilution to holders of our Class A common stock beyond the conversion prices up to the cap prices on any conversion of the Convertible Notes or offset any cash payments we are required to make in excess of the principal amount, as the case may be, with such reduction or offset subject to a cap. The cost of the Capped Call Transactions was recorded as a reduction of our additional paid-in capital in our consolidated balance sheets.