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Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Acquired Finite-Lived Intangible Assets |  |  |
Payments to Acquire Intangible Assets | $ 2,775 | $ 2,500 | $ 0
Goodwill, Gross |  |  |
Balance, beginning of period | 227,224 | 58,397 |
Additions | 0 | 147,845 |
Purchase accounting adjustments | 4,627 | (1,865) |
Foreign currency fluctuations | (10,141) | 22,847 |
Balance, end of period | 221,710 | 227,224 | 58,397
Accumulated Impairment Losses |  |  |
Balance, beginning of period | (41,180) | (37,332) |
Foreign currency fluctuations | (2,142) | (3,848) |
Balance, end of period | (39,038) | (41,180) | (37,332)
Goodwill, Net |  |  |
Balance, beginning of period | 186,044 | 21,065 |
Additions | 0 | 147,845 |
Purchase accounting adjustments | 4,627 | (1,865) |
Foreign currency fluctuations | (8,000) | 18,999 |
Balance, end of period | 182,671 | 186,044 | 21,065
Acquired Finite-lived Intangible Assets |  |  |
Original cost | 191,087 | 195,912 |
Accumulated amortization | (44,541) | (23,565) |
Intangible Assets, Net | 146,546 | 172,347 |
Amortization of Intangible Assets | 22,129 | 17,054 | $ 409
Estimated aggregate amortization expense of Intangible Assets |  |  |
2019 | 21,297 |  |
2020 | 19,873 |  |
2021 | 18,092 |  |
2022 | 15,913 |  |
2023 | 14,352 |  |
Thereafter | 57,019 |  |
Total | 146,546 |  |
Customer Lists |  |  |
Acquired Finite-lived Intangible Assets |  |  |
Original cost | 143,059 | 149,355 |
Accumulated amortization | (33,714) | (17,870) |
Intangible Assets, Net | $ 109,345 | $ 131,485 |
Weighted-average original life (in years) | 15 years | 15 years |
Trade Name |  |  |
Acquired Finite-lived Intangible Assets |  |  |
Original cost | $ 30,592 | $ 31,968 |
Accumulated amortization | (5,327) | (2,436) |
Intangible Assets, Net | $ 25,265 | $ 29,532 |
Weighted-average original life (in years) | 10 years | 10 years |
Technology |  |  |
Acquired Finite-Lived Intangible Assets |  |  |
Payments to Acquire Intangible Assets | $ 2,775 |  |
Acquired Finite-lived Intangible Assets |  |  |
Original cost | 17,436 | $ 14,589 |
Accumulated amortization | (5,500) | (3,259) |
Intangible Assets, Net | $ 11,936 | $ 11,330 |
Weighted-average original life (in years) | 10 years | 11 years |

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