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Debt | 6 Months Ended
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Jun. 30, 2021
Debt Disclosure [Abstract] |
Debt | Debt The table below presents the components of the Company’s debt:
| June 30, 2021 |  | December 31, 2020
2023 Convertible Notes | $ | 316,250 |  |  | $ | 316,250 |
Credit Facility | 100,000 |  |  | — |
Total debt | 416,250 |  |  | 316,250 |
Less: deferred debt discount | (21,582) |  |  | (26,310) |
Less: deferred debt issue costs | (3,087) |  |  | (3,809) |
Long-term debt, net (1) | $ | 391,581 |  |  | $ | 286,131 |
Additional paid-in capital | $ | 35,306 |  |  | $ | 35,306 |
Discount attribution to equity | (1,175) |  |  | (1,175) |
Equity component, net | $ | 34,131 |  |  | $ | 34,131 |
(1)There were no current portions of long-term debt as of June 30, 2021 and December 31, 2020. 2023 Convertible Notes On August 20, 2018, we issued the 2023 Convertible Notes in an aggregate principal amount of $316.3 million. The 2023 Convertible Notes bear interest at a fixed rate of 2.0% per year, payable semiannually in arrears on February 15th and August 15th of each year and will mature on August 15, 2023, unless earlier converted or repurchased. The 2023 Convertible Notes are senior unsecured obligations of the Company. The 2023 Convertible Notes are convertible at maturity at a conversion rate of 9.8643 shares of our common stock per $1,000 principal amount of the 2023 Convertible Notes (equivalent to a conversion price of approximately $101.38 per share of common stock). Subject to the conditions set forth in the indenture governing the 2023 Convertible Notes, holders may convert their 2023 Convertible Notes at any time prior to the close of business on the business day immediately preceding May 15, 2023. The circumstances required to allow the holders to convert their 2023 Convertible Notes prior to maturity were met as of June 30, 2021, therefore, holders may convert their notes at any time beginning on July 1, 2021 and ending on September 30, 2021. We continue to classify the net carrying amount of the 2023 Convertible Notes as long-term debt based on our intent and ability to refinance the principal portion of our debt on a long-term basis. The excess of the principal amount of the liability over its carrying amount ("debt discount") is amortized to interest expense over the term of the 2023 Convertible Notes using the effective interest rate method. We incurred debt issue costs and allocated the total amount to the liability and equity components of the 2023 Convertible Notes based on their relative values. The debt issue costs attributable to the liability component are amortized to interest expense over the term of the 2023 Convertible Notes using the effective interest rate method. Issuance costs attributable to the equity component were netted with the equity component in stockholders' equity. The table below summarizes the amount of interest cost recognized by us for both the contractual interest expense and amortization of the debt discount for the 2023 Convertible Notes:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Contractual interest expense | $ | 1,581 |  |  | $ | 1,581 |  |  | $ | 3,162 |  |  | $ | 3,162 |
Amortization of debt discount (1) | 2,380 |  |  | 2,255 |  |  | 4,728 |  |  | 4,480 |
Total | $ | 3,961 |  |  | $ | 3,836 |  |  | $ | 7,890 |  |  | $ | 7,642 |
(1)The effective interest rate of the liability component is 5.45%. Credit Facility On June 26, 2015, we entered into a credit agreement, which provides for a $550.0 million senior secured bank revolving credit facility (“Original Credit Facility”) maturing on June 26, 2020. In November 2018, we amended and restated the credit agreement to the Original Credit Facility, to, among other things, extend the maturity to November 30, 2023 and incurred an additional $1.7 million of debt issuance costs (the Original Credit Facility as amended and restated, the “Credit Facility”). The Company classified the borrowings under the Company’s Credit Facility as long-term debt in the accompanying Condensed Consolidated Balance Sheets, as amounts due under the Credit Facility are not contractually required or expected to be liquidated for more than one year from the applicable balance sheet date. As of June 30, 2021, $1.1 million of the borrowing limit under the Credit Facility was utilized (and, therefore, unavailable) for letters of credit. There were $1.1 million and $1.3 million of unamortized debt issue costs related to the Credit Facility as of June 30, 2021 and December 31, 2020, respectively. These amounts are included in “Other assets” on our Condensed Consolidated Balance Sheets.

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- Definition The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -URI http://asc.fasb.org/topic&trid=2208564 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495334-112611 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1I -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495371-112611 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1I -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495371-112611 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(c)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495334-112611 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1C -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495334-112611 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1E -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495348-112611 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1I -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495371-112611 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 + Details
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