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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)