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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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