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Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Goodwill, Gross |  |  |
Balance, beginning of period | $ 58,397 | $ 60,447 |
Additions | 147,845 | 3,787 |
Purchase accounting adjustments | (1,865) |  |
Foreign currency fluctuations | 22,847 | (5,837) |
Balance, end of period | 227,224 | 58,397 | $ 60,447
Accumulated Impairment Losses |  |  |
Balance, beginning of period | (37,332) | (43,644) |
Foreign currency fluctuations | 3,848 | 6,312 |
Balance, end of period | (41,180) | (37,332) | (43,644)
Goodwill, Net |  |  |
Balance, beginning of period | 21,065 | 16,803 |
Additions | 147,845 | 3,787 |
Purchase accounting adjustments | (1,865) |  |
Foreign currency fluctuations | 18,999 | 475 |
Balance, end of period | 186,044 | 21,065 | 16,803
Acquired Finite-lived Intangible Assets |  |  |
Original cost | 195,912 | 15,152 |
Accumulated amortization | (23,565) | (8,692) |
Intangible Assets, Net | 172,347 | 6,460 |
Acquired intangibles | 159,445 |  |
Payments to acquire intangible assets | $ 2,500 | 0 | 0
Finite-lived intangible asset, useful life (in years) | 5 years |  |
Amortization expense | $ 17,054 | 409 | $ 1,481
Estimated aggregate amortization expense of Intangible Assets |  |  |
2018 | 22,345 |  |
2019 | 21,691 |  |
2020 | 20,198 |  |
2021 | 18,561 |  |
2022 | 16,367 |  |
Thereafter | 73,185 |  |
Total | 172,347 |  |
Customer Lists |  |  |
Acquired Finite-lived Intangible Assets |  |  |
Original cost | 149,355 | 8,016 |
Accumulated amortization | (17,870) | (5,948) |
Intangible Assets, Net | $ 131,485 | $ 2,068 |
Weighted-average original life (in years) | 15 years | 15 years |
Trade Name |  |  |
Acquired Finite-lived Intangible Assets |  |  |
Original cost | $ 31,968 | $ 2,000 |
Accumulated amortization | (2,436) | 0 |
Intangible Assets, Net | $ 29,532 | $ 2,000 |
Weighted-average original life (in years) | 10 years | 15 years |
Technology |  |  |
Acquired Finite-lived Intangible Assets |  |  |
Original cost | $ 14,589 | $ 5,136 |
Accumulated amortization | (3,259) | (2,744) |
Intangible Assets, Net | $ 11,330 | $ 2,392 |
Weighted-average original life (in years) | 11 years | 13 years |

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