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Fair Value Measurements - Financial Instruments Not Required to be Measured at Fair Value (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
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 $ 6,477 $ 7,262
Carrying Value | Level 2 | 1.750% Senior Notes    
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis    
Debt 553,050 557,185
Carrying Value | Level 2 | 3.375% Senior Notes    
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis    
Debt 495,480 495,240
Carrying Value | Level 2 | 3.5% Senior Notes    
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis    
Debt 594,660 594,502
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 55,187 43,539
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 24,513 28,117
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 6,477 7,262
Fair Value | Level 2 | 1.750% Senior Notes    
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis    
Debt 349,659 562,399
Fair Value | Level 2 | 3.375% Senior Notes    
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis    
Debt 349,145 510,145
Fair Value | Level 2 | 3.5% Senior Notes    
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis    
Debt 409,692 609,918
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 55,187 43,539
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 24,513 28,117
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 1,109,348 1,014,138
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 1,109,348 1,014,138
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 761,526 983,061
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 $ 761,526 $ 983,061