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Fair Value Measurements - Financial Instruments Not Required to be Measured at Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018 | Mar. 31, 2016 | Nov. 30, 2014
--- | --- | --- | --- | ---
1.750% Senior Notes |  |  |  |
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis |  |  |  |
Interest rate (as a percent) | 1.75% |  | 1.75% |
3.375% Senior Notes |  |  |  |
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis |  |  |  |
Interest rate (as a percent) | 3.50% |  |  |
3.5% Senior Notes |  |  |  |
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis |  |  |  |
Interest rate (as a percent) | 4.25% |  |  | 3.50%
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 | $ 47,873 | $ 214,828 |  |
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 | 545,062 | 569,372 |  |
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 | 495,000 | 494,280 |  |
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 | 594,345 | 593,871 |  |
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 | 47,737 | 30,929 |  |
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 | 38,906 | 32,645 |  |
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 | 47,873 | 214,828 |  |
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 | 557,378 | 589,864 |  |
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 | 499,815 | 484,790 |  |
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 | 604,038 | 583,200 |  |
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 | 47,737 | 30,929 |  |
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 | 38,906 | 32,645 |  |
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 | 1,017,737 | 1,091,868 |  |
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 | 1,017,737 | 1,091,868 |  |
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 | 787,367 | 672,878 |  |
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 | $ 787,367 | $ 672,878 |  |

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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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