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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |  |
Changes in the carrying amount of Goodwill | The changes in the carrying amount of Goodwill are as follows:
| Goodwill |  | Accumulated Impairment Losses |  | Total
Balance as of December 31, 2016 | $ | 58,397 |  |  | $ | (37,332 | ) |  | $ | 21,065 |
Additions | 147,845 |  |  | — |  |  | 147,845 |
Purchase accounting adjustments | (1,865 | ) |  | — |  |  | (1,865 | )
Foreign currency fluctuations | 22,847 |  |  | (3,848 | ) |  | 18,999 |
Balance as of December 31, 2017 | $ | 227,224 |  |  | $ | (41,180 | ) |  | $ | 186,044 |
Additions | — |  |  | — |  |  | — |
Purchase accounting adjustments | 4,627 |  |  | — |  |  | 4,627 |
Foreign currency fluctuations | (10,141 | ) |  | 2,142 |  |  | (8,000 | )
Balance as of December 31, 2018 | $ | 221,710 |  |  | $ | (39,038 | ) |  | $ | 182,671 |
Acquired Intangible Assets excluding Goodwill |  | The balances of acquired Intangible Assets, excluding Goodwill, as of December 31, are as follows:
| Customer Lists |  | Trade Names |  | Technology |  | Total
Balance as of December 31, 2018 |  |  |  |  |  |  |
Original cost | $ | 143,059 |  |  | $ | 30,592 |  |  | $ | 17,436 |  |  | $ | 191,087 |
Accumulated amortization | (33,714 | ) |  | (5,327 | ) |  | (5,500 | ) |  | (44,541 | )
Carrying amount | $ | 109,345 |  |  | $ | 25,265 |  |  | $ | 11,936 |  |  | $ | 146,546 |
Weighted-average original life (in years) | 15 |  |  | 10 |  |  | 10 |  |  |  |
Balance as of December 31, 2017 |  |  |  |  |  |  |  |  |  |  |
Original cost | $ | 149,355 |  |  | $ | 31,968 |  |  | $ | 14,589 |  |  | $ | 195,912 |
Accumulated amortization | (17,870 | ) |  | (2,436 | ) |  | (3,259 | ) |  | (23,565 | )
Carrying amount | $ | 131,485 |  |  | $ | 29,532 |  |  | $ | 11,330 |  |  | $ | 172,347 |
Weighted-average original life (in years) | 15 |  |  | 10 |  |  | 11 |  |  |  |
Estimated aggregate amortization expense of Intangible Assets | Estimated aggregate amortization expense based on the current carrying amount of amortizable Intangible Assets for each of the five succeeding years is as follows:
2019 | $ | 21,297 |
2020 | 19,873 |
2021 | 18,092 |
2022 | 15,913 |
2023 | 14,352 |
Thereafter | 57,019 |
Total | $ | 146,546 |

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- Definition Tabular disclosure of the characteristics, including initial carrying value, residual amount, weighted average useful life, of finite-lived intangible assets acquired during the period by major class. A major class is composed of intangible assets that can be grouped together because they are similar, either by nature or by their use in the operations of the company. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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