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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Jan. 01, 2018 | Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Foreign exchange gains (losses) | $ 500 |  | $ (1,500) |  |
Retained earnings | 3,181,110 | [1] |  |  | $ 2,958,921
Prepaid expenses and other current assets | 163,802 | [1] |  |  | 187,820
Other assets | 141,702 | [1] |  |  | 114,962
Deferred income taxes | $ 505,150 | [1] |  |  | 518,912
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Retained earnings |  |  |  | $ 30,900 |
Prepaid expenses and other current assets |  |  |  | 10,200 |
Other assets |  |  |  | 30,300 |
Deferred income taxes |  |  |  | $ 9,600 |
Accounting Standards Update 2016-15 |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |
Retained earnings |  |  |  |  | 17,100
Deferred tax assets |  |  |  |  | $ 19,500
[1] | Reflects January 1, 2018 adoption of Accounting Standards Update 2014-09, "Revenue from Contracts with Customers (Topic 606)" and related cost capitalization guidance using the modified retrospective transition method. The adoption of Topic 606 resulted in an adjustment to retained earnings in our consolidated balance sheet for the cumulative effective of applying the standard, which included costs incurred to obtain a contract, as well as presentation changes in our statements of income, including the classification of certain amounts previously classified as merchant commissions and processing expense net with revenues. As a result of the application of the modified retrospective transition method, the Company's prior period results within its annual report on Form 10-K and quarterly reports on Form 10-Q will not be restated to reflect the impact of Topic 606. See footnote 1.

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