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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
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