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Fair Value of Financial Instruments - Financial Instruments Not Required to be Measured at Fair Value (Details) $ in Thousands, € in Millions | Dec. 31, 2017 EUR (€) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Mar. 31, 2016 | Nov. 30, 2014 | Sep. 30, 2011
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Revolving Credit Facility |  |  |  |  |  |
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis |  |  |  |  |  |
Maximum borrowing capacity | € | € 125 |  |  |  |  |
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% | 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) | 3.375% | 3.375% | 3.375% |  |  | 3.375%
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) | 3.50% | 3.50% | 3.50% |  | 3.50% |
Carrying Value |  |  |  |  |  |
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis |  |  |  |  |  |
Marketable securities, current |  | $ 103,351 | $ 56,197 |  |  |
Notes receivable, including noncurrent portion |  | 26,006 | 29,458 |  |  |
Carrying Value | Revolving Credit Facility |  |  |  |  |  |
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis |  |  |  |  |  |
Debt |  |  | 52,735 |  |  |
Carrying Value | 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 |  | 597,674 | 523,629 |  |  |
Carrying Value | 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 |  | 496,859 | 496,011 |  |  |
Carrying Value | 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 |  | 493,320 | 492,360 |  |  |
Carrying Value | Notes payable, including noncurrent portion |  |  |  |  |  |
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis |  |  |  |  |  |
Debt |  | 31,106 | 35,457 |  |  |
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 |  | 103,351 | 56,197 |  |  |
Fair Value | Level 2 | Revolving Credit Facility |  |  |  |  |  |
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis |  |  |  |  |  |
Debt |  |  | 52,735 |  |  |
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 |  | 622,277 | 551,582 |  |  |
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 |  | 512,475 | 512,510 |  |  |
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 |  | 513,480 | 508,230 |  |  |
Fair Value | Level 2 | Notes payable, including noncurrent portion |  |  |  |  |  |
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis |  |  |  |  |  |
Debt |  | 31,106 | 35,457 |  |  |
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 |  | 26,006 | 29,458 |  |  |
Bank deposits | Carrying Value |  |  |  |  |  |
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis |  |  |  |  |  |
Cash and cash equivalents |  | 1,104,316 | 1,133,295 |  |  |
Bank deposits | 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 |  | 1,104,316 | 1,133,295 |  |  |
Time deposits | Carrying Value |  |  |  |  |  |
Estimated fair values of the company's financial instruments that are not measured at fair value on a recurring basis |  |  |  |  |  |
Cash and cash equivalents |  | 698,458 | 696,106 |  |  |
Time deposits | 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 |  | $ 698,458 | $ 696,106 |  |  |

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