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Summary of Significant Accounting Policies (Narrative) (Details) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 10, 2019 item | Jun. 30, 2019 USD ($) $ / shares shares | Jun. 30, 2018 USD ($) $ / shares | Jun. 30, 2019 USD ($) $ / shares shares | Jun. 30, 2018 USD ($) $ / shares | Mar. 29, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares | Dec. 31, 2017 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
cash, cash equivalents, restricted cash and cash equivalents |  | $ 1,128,322 | $ 524,011 | $ 1,128,322 | $ 524,011 |  | $ 464,695 | $ 388,260
Cash and cash equivalents |  | 1,118,662 |  | 1,118,662 |  |  | 440,332 |
Restricted cash and cash equivalents |  | 9,660 |  | 9,660 |  |  | 24,363 |
Long-lived assets, intangible assets and goodwill located in the foreign operations |  | 321,409 |  | 321,409 |  |  | 270,073 |
Allowance for doubtful accounts, loan receivables and chargebacks |  | 33,439 |  | 33,439 |  |  | 23,411 |
Deferred Revenue |  | $ 5,930 |  | 5,930 |  |  | $ 5,918 | $ 6,116
Deferred Revenue, Revenue Recognized |  |  |  | $ 4,193 | 5,395 |  |  |
Percentage on relief of total income tax |  |  |  | 60.00% |  |  |  |
Percentage on relief of payroll tax |  |  |  | 70.00% |  |  |  |
Redeemable convertible preferred stock, Shares Issued | shares |  | 100,000 |  | 100,000 |  |  |  |
Redeemable convertible preferred stock, Par Value | $ / shares |  | $ 0.001 |  | $ 0.001 |  |  | $ 0.001 |
Recognized gains in interest income and other financial gains |  |  |  | $ 3,722 |  |  |  |
Series A Preferred Stock [Member] |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Redeemable convertible preferred stock, Shares Issued | shares |  |  |  |  |  | 100,000 |  |
Redeemable convertible preferred stock, Par Value | $ / shares |  |  |  |  |  | $ 0.001 |  |
Redeemable convertible preferred stock aggregate |  |  |  |  |  | $ 100,000 |  |
Preferred Stock, Embedded Beneficial Conversion feature |  |  |  |  |  | $ 5,841 |  |
New Software Development Law [Member] |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Minimum Percent Of Revenues Measured For New Benefits | 70.00% |  |  |  |  |  |  |
New Law, Reduction Of Corporate Income Tax Rate | 15.00% |  |  |  |  |  |  |
New Tax Law, Multiplier For Tax Credit | item | 1.6 |  |  |  |  |  |  |
Income tax gain |  | $ 774 | 10,562 | 4,093 | 3,263 |  |  |
Labor cost benefit |  | $ 2,241 | $ 1,719 | $ 4,637 | $ 3,735 |  |  |
Aggregate per share effect of the Argentine tax holiday | $ / shares |  | $ 0.02 | $ 0.07 | $ 0.09 | $ 0.24 |  |  |
Software development law audit fees |  | $ 211 | $ 349 | $ 611 | $ 1,001 |  |  |

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