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Fair Value Measurements - Financial Instruments Not Required to be Measured at Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Carrying Value | Level 2 |  |
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis |  |
Marketable securities, current | $ 67,164 | $ 23,345
Carrying Value | Level 2 | 2023 Notes |  |
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis |  |
Debt | 196,271 | 609,764
Carrying Value | Level 2 | 2024 Notes |  |
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis |  |
Debt | 378,666 | 496,200
Carrying Value | Level 2 | 2028 Notes |  |
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis |  |
Debt | 595,607 | 595,134
Carrying Value | Level 2 | Other borrowings |  |
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis |  |
Debt | 4,639 | 4,890
Carrying Value | Level 3 |  |
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis |  |
Notes receivable, including noncurrent portion | 10,490 | 28,488
Fair Value | Level 2 |  |
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis |  |
Marketable securities, current | 67,164 | 23,345
Fair Value | Level 2 | 2023 Notes |  |
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis |  |
Debt | 201,126 | 578,554
Fair Value | Level 2 | 2024 Notes |  |
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis |  |
Debt | 400,011 | 494,045
Fair Value | Level 2 | 2028 Notes |  |
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis |  |
Debt | 619,932 | 599,220
Fair Value | Level 2 | Other borrowings |  |
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis |  |
Debt | 4,639 | 4,890
Fair Value | Level 3 |  |
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis |  |
Notes receivable, including noncurrent portion | 10,490 | 28,488
Cash | Carrying Value | Level 1 |  |
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis |  |
Cash and cash equivalents | 1,320,302 | 1,180,024
Cash | Fair Value | Level 1 |  |
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis |  |
Cash and cash equivalents | 1,320,302 | 1,180,024
Cash equivalents | Carrying Value | Level 2 |  |
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis |  |
Cash and cash equivalents | 805,213 | 1,018,757
Cash equivalents | Fair Value | Level 2 |  |
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis |  |
Cash and cash equivalents | $ 805,213 | $ 1,018,757

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69C -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69B -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1D -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611 + Details
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