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Revenue Recognition - Balance Sheet Impact (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Revenue |  |  |  |  |  |
Prepaid expenses and other current assets | $ 34,000 |  | $ 30,683 |  |  |
Accrued income taxes | 5,062 |  | 11,503 |  |  |
Deferred revenue and customer deposits | 9,845 |  | 9,420 |  | $ 7,078 |
Retained earnings | $ 646,214 | [1] | 668,587 | [1] | 644,622 | $ 573,286
As previously reported |  |  |  |  |  |
Revenue |  |  |  |  |  |
Prepaid expenses and other current assets |  |  | 30,800 |  |  |
Accrued income taxes |  |  | 11,391 |  |  |
Deferred revenue and customer deposits |  |  | 9,969 |  |  |
Retained earnings |  |  | 668,267 |  | 643,836 | 566,622
Adjustment [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |
Revenue |  |  |  |  |  |
Prepaid expenses and other current assets |  |  | (117) |  |  |
Accrued income taxes |  |  | 112 |  |  |
Deferred revenue and customer deposits |  |  | (549) |  |  |
Retained earnings |  |  | $ 320 |  | $ 786 | $ 6,664
[1] | Prior period amounts have been adjusted to reflect the two-for-one stock split effected in the form of a stock dividend

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