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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)		3 Months Ended			9 Months Ended			12 Months Ended
	Aug. 24, 2018	Sep. 30, 2018		Sep. 30, 2017	Sep. 30, 2018		Sep. 30, 2017	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Aug. 31, 2018	Jan. 01, 2018	Dec. 31, 2016
Significant Accounting Policies [Line Items]
Long-lived assets, intangible assets and goodwill located in the foreign operations		$ 242,061,000			$ 242,061,000						$ 223,134,000
Tax Cuts and Jobs Act of 2017, Foreign Tax Credits, Valuation Allowance											12,097,000
Foreign tax credit, valuation allowance		12,659,000			12,659,000						12,097,000
Allowance for doubtful accounts, loan receivables and chargebacks		29,980,000			29,980,000						19,734,000
Deferred Revenue		6,414,000			6,414,000						6,116,000			$ 1,955,000
Deferred Revenue, Revenue Recognized					$ 4,913,000		$ 1,994,000
Percentage on relief of total income tax					60.00%
Percentage on relief of payroll tax					70.00%
Foreign tax credit		12,659,000			$ 12,659,000						$ 12,097,000
Shipping costs		107,555,000		$ 65,740,000	316,705,000		102,638,000
Convertible Senior Notes [Member] | Initial Issuance - 2028 Convertible Senior Notes [Member]
Significant Accounting Policies [Line Items]
Debt instrument, face amount	$ 800,000,000
Convertible Senior Notes [Member] | Additional Issuance - 2028 Convertible Senior Notes [Member]
Significant Accounting Policies [Line Items]
Debt instrument, face amount												$ 80,000,000
Convertible Senior Notes [Member] | 2028 Convertible Senior Notes [Member]
Significant Accounting Policies [Line Items]
Debt instrument, face amount		880,000,000			880,000,000							$ 880,000,000
Debt instrument, interest rate	2.00%											2.00%
Amount paid to enter into capped call transactions	$ 91,784,000
Amount of the debt component	$ 546,532,000
Market rate for non-convertible debt	7.44%
Amount of the equity component	$ 333,468,000	327,305,000	[1]		327,305,000	[1]
Effective interest rate	7.66%
Deferred tax liability	$ 70,028,000
Amount of debt extinguished	263,724,000
Extinguishment of debt amount through private exchange agreement	$ 131,602,000
Benchmark percentage, present value of discounted cash flows under the conditions of new instrument and original instrument	10.00%
Benchmark percentage, change in the fair value of the embedded conversion option, perccet of carrying value of original debt prior to exchange	10.00%
Accounting Standards Update 2016-16 [Member]
Significant Accounting Policies [Line Items]
Increase to the opening balance of retained earnings													$ 2,092,000
Accounting Standards Update 2014-09 [Member]
Significant Accounting Policies [Line Items]
Amount effected by change in accounting standard				65,740,000			102,638,000
Argentina [Member]
Significant Accounting Policies [Line Items]
Percent income tax rate											35.00%
New Software Development Law [Member]
Significant Accounting Policies [Line Items]
Income tax gain		7,912,000		6,367,000	18,474,000		17,672,000
Labor cost benefit		$ 1,681,000		$ 2,016,000	$ 5,415,000		$ 5,513,000
Aggregate per share effect of the Argentine tax holiday		$ 0.18		$ 0.14	$ 0.42		$ 0.40
Software development law audit fees		$ 437,000		$ 587,000	$ 1,438,000		$ 1,623,000
Scenario, Plan [Member] | Argentina [Member]
Significant Accounting Policies [Line Items]
Percent income tax rate								25.00%	30.00%	30.00%
Withholding income tax on dividends paid percent								13.00%	7.00%	7.00%
[1] Net of $6,163 thousands of transaction costs related to the equity component of the 2028 Notes.

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