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Fair Value Measurements - Financial Instruments Not Required to be Measured at Fair Value (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Aug. 31, 2018 | Mar. 31, 2016 | Nov. 30, 2014
--- | --- | --- | --- | --- | ---
Senior Notes 1.750%, Due 21 March 2023 |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Interest rate |  |  |  | 1.75% |
Senior Notes 3.5%, Due 15 December 2024 |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Interest rate |  |  |  |  | 3.50%
Senior Notes 4.25%, Due 15 September 2028 |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Interest rate |  |  | 4.25% |  |
Carrying Value | Level 2 |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Marketable securities, current | $ 23,345 | $ 7,262 |  |  |
Carrying Value | Level 2 | Senior Notes 1.750%, Due 21 March 2023 |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Debt | 609,764 | 557,185 |  |  |
Carrying Value | Level 2 | Senior Notes 3.5%, Due 15 December 2024 |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Debt | 496,200 | 495,240 |  |  |
Carrying Value | Level 2 | Senior Notes 4.25%, Due 15 September 2028 |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Debt | 595,134 | 594,502 |  |  |
Carrying Value | Level 2 | Other borrowings, including noncurrent portion |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Debt | 34,350 | 43,539 |  |  |
Carrying Value | Level 3 |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Notes receivable, including noncurrent portion | 38,295 | 28,117 |  |  |
Carrying Value | Cash | Level 1 |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Cash and cash equivalents | 1,180,024 | 1,014,138 |  |  |
Carrying Value | Cash equivalents | Level 2 |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Cash and cash equivalents | 1,018,757 | 983,061 |  |  |
Fair Value | Level 2 |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Marketable securities, current | 23,345 | 7,262 |  |  |
Fair Value | Level 2 | Senior Notes 1.750%, Due 21 March 2023 |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Debt | 578,554 | 562,399 |  |  |
Fair Value | Level 2 | Senior Notes 3.5%, Due 15 December 2024 |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Debt | 494,045 | 510,145 |  |  |
Fair Value | Level 2 | Senior Notes 4.25%, Due 15 September 2028 |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Debt | 599,220 | 609,918 |  |  |
Fair Value | Level 2 | Other borrowings, including noncurrent portion |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Debt | 34,350 | 43,539 |  |  |
Fair Value | Level 3 |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Notes receivable, including noncurrent portion | 38,295 | 28,117 |  |  |
Fair Value | Cash | Level 1 |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Cash and cash equivalents | 1,180,024 | 1,014,138 |  |  |
Fair Value | Cash equivalents | Level 2 |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Cash and cash equivalents | $ 1,018,757 | $ 983,061 |  |  |

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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