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Fair Value Measurement of Assets and Liabilities (Fair Value of Money Market Funds, Short and Long-Term Investments Classified as Available for Sale Securities) (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cost |  | $ 1,750,018 |  | $ 914,566
Gross Unrealized Gains | [1] | 3,026 |  | 3,233
Gross Unrealized Losses | [1] |  |  | (3)
Financial Gains |  | 3,722 |  |
Estimated Fair Value |  | 1,756,766 |  | 917,796
Fair value option |  | 3,722 |  |
Cash and Cash Equivalents [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cost |  | 168,741 |  | 179,252
Estimated Fair Value |  | 168,741 |  | 179,252
Cash and Cash Equivalents [Member] | Money Market Funds [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cost |  | 168,741 |  | 179,252
Estimated Fair Value |  | 168,741 |  | 179,252
Restricted Cash and Cash Equivalents [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cost |  | 9,591 |  | 24,363
Estimated Fair Value |  | 9,591 |  | 24,363
Restricted Cash and Cash Equivalents [Member] | Money Market Funds [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cost |  | 9,591 |  | 24,363
Estimated Fair Value |  | 9,591 |  | 24,363
Short-term Investments [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cost |  | 1,370,257 |  | 439,683
Gross Unrealized Gains | [1] | 599 |  | 1,802
Financial Gains |  | 3,721 |  |
Estimated Fair Value |  | 1,374,577 |  | 441,485
Short-term Investments [Member] | Central Bank of Brazil Mandatory Guarantee [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cost |  | 337,301 | [2] | 282,752
Gross Unrealized Gains | [1] |  |  | 1,565
Financial Gains | [2] | 1,998 |  |
Estimated Fair Value |  | 339,299 | [2] | 284,317
Short-term Investments [Member] | Sovereign Debt Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cost |  | 1,032,882 | [3] | 156,910
Gross Unrealized Gains | [1] | 599 | [3] | 237
Financial Gains | [3] | 1,723 |  |
Estimated Fair Value |  | 1,035,204 | [3] | 157,147
Short-term Investments [Member] | Corporate Debt Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cost |  | 74 |  | 21
Estimated Fair Value |  | 74 |  | 21
Short-term Investments [Member] | U.S. Treasury Notes [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Fair value option |  | 809,380 |  |
Long-term Investments [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cost |  | 201,429 |  | 271,268
Gross Unrealized Gains | [1] | 2,427 |  | 1,431
Gross Unrealized Losses | [1] |  |  | (3)
Financial Gains |  | 1 |  |
Estimated Fair Value |  | 203,857 |  | 272,696
Long-term Investments [Member] | Sovereign Debt Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cost |  | 201,250 |  | 271,024
Gross Unrealized Gains | [1] | 2,425 |  | 1,431
Financial Gains |  | 1 |  |
Estimated Fair Value |  | 203,676 |  | 272,455
Long-term Investments [Member] | Corporate Debt Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cost |  | 179 |  | 244
Gross Unrealized Gains | [1] | 2 |  |
Gross Unrealized Losses | [1] |  |  | (3)
Estimated Fair Value |  | $ 181 |  | $ 241
[1] | Unrealized gains (losses) from securities are attributable to market price movements, net foreign exchange losses and foreign currency translation. Management does not believe any remaining significant unrealized losses represent other-than-temporary impairments based on the evaluation of available evidence including the credit rating of the investments, as of June 30, 2019.
[2] | 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)
[3] | Includes $809,380 thousands of U.S treasury notes 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, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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