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		3 Months Ended
		Mar. 31, 2019		Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]
Cost		$ 1,826,903		$ 914,566
Gross Unrealized Gains	[1]	1,937		3,233
Gross Unrealized Losses	[1]	(1)		(3)
Financial Gains		3,048
Estimated Fair Value		1,831,887		917,796
Fair value option		3,048
Cash and Cash Equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost		239,269		179,252
Estimated Fair Value		239,269		179,252
Cash and Cash Equivalents [Member] | Money Market Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost		239,269		179,252
Estimated Fair Value		239,269		179,252
Restricted Cash and Cash Equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost		9,556		24,363
Estimated Fair Value		9,556		24,363
Restricted Cash and Cash Equivalents [Member] | Money Market Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost		9,556		24,363
Estimated Fair Value		9,556		24,363
Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost		1,307,675		439,683
Gross Unrealized Gains	[1]	98		1,802
Financial Gains		3,047
Estimated Fair Value		1,310,820		441,485
Short-term Investments [Member] | Central Bank of Brazil Mandatory Guarantee [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost		236,309	[2]	282,752
Gross Unrealized Gains	[1]			1,565
Financial Gains	[2]	1,720
Estimated Fair Value		238,029	[2]	284,317
Short-term Investments [Member] | Sovereign Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost		1,071,309	[3]	156,910
Gross Unrealized Gains	[1]	98	[3]	237
Financial Gains	[3]	1,327
Estimated Fair Value		1,072,734	[3]	157,147
Short-term Investments [Member] | Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost		57		21
Estimated Fair Value		57		21
Short-term Investments [Member] | U.S. Treasury Notes [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value option		806,087
Long-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost		270,403		271,268
Gross Unrealized Gains	[1]	1,839		1,431
Gross Unrealized Losses	[1]	(1)		(3)
Financial Gains		1
Estimated Fair Value		272,242		272,696
Long-term Investments [Member] | Sovereign Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost		270,206		271,024
Gross Unrealized Gains	[1]	1,837		1,431
Financial Gains		1
Estimated Fair Value		272,044		272,455
Long-term Investments [Member] | Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost		197		244
Gross Unrealized Gains	[1]	2
Gross Unrealized Losses	[1]	(1)		(3)
Estimated Fair Value		$ 198		$ 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 March 31, 2019 and December 31, 2018.

[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 - Investments fair value option)

[3] Includes $806,087 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 - Investments fair value option)