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Fair Value Measurement of Assets and Liabilities (Narrative) (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Estimated Fair Value | $ 1,756,766 |  | $ 917,796
Short-term Investments [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Estimated Fair Value | 1,374,577 |  | 441,485
Auction Rate Securities [Member] | Direct Investment [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Investments | 0 |  | 0
Non-financial assets | 0 |  | 0
Non-financial liabilities | 0 |  | $ 0
2028 Convertible Senior Notes [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Net carrying amount | $ 627,654 |  |
Central Bank of Brazil Mandatory Guarantee [Member] | Short-term Investments [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Percent of electronic currency deposited | 100.00% |  | 80.00%
Estimated Fair Value | $ 339,299 | [1] | $ 284,317
[1] | Brazilian government bonds measured at fair value with impact on the consolidated statement of income for the application of the fair value option. (See Note 2 – Fair value option applied to certain financial instruments)

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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