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Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Goodwill, Gross |  |  |
Balance, beginning of period | $ 227,224 |  |
Purchase accounting adjustments | 4,627 |  |
Foreign currency fluctuations | 7,047 |  |
Balance, end of period | 238,898 |  | $ 227,224
Accumulated Impairment Losses |  |  |
Balance, beginning of period | (41,180) |  |
Foreign currency fluctuations | (1,553) |  |
Balance, end of period | (42,733) |  | (41,180)
Goodwill, Net |  |  |
Balance, beginning of period | 186,044 |  |
Purchase accounting adjustments | 4,627 |  |
Foreign currency fluctuations | 5,494 |  |
Balance, end of period | 196,165 |  | 186,044
Acquired Finite-lived Intangible Assets |  |  |
Original cost | 202,808 |  | 195,912
Accumulated amortization | (30,511) |  | (23,565)
Carrying value | 172,297 |  | 172,347
Purchase of Intangible Assets | 1,000 | $ 2,500 |
Amortization expense | 5,838 | $ 244 |
Estimated aggregate amortization expense of Intangible Assets |  |  |
Remaining 2018 |  |  | 17,115
2019 | 22,388 |  |
2020 | 20,853 |  |
2021 | 19,170 |  |
2022 | 16,928 |  |
Thereafter | 75,843 |  |
Total | 172,297 |  |
Customer Lists |  |  |
Acquired Finite-lived Intangible Assets |  |  |
Original cost | 154,096 |  | 149,355
Accumulated amortization | (23,303) |  | (17,870)
Carrying value | $ 130,793 |  | $ 131,485
Weighted-average original life (in years) | 15 years |  | 15 years
Trade Names |  |  |
Acquired Finite-lived Intangible Assets |  |  |
Original cost | $ 32,818 |  | $ 31,968
Accumulated amortization | (3,293) |  | (2,436)
Carrying value | $ 29,525 |  | $ 29,532
Weighted-average original life (in years) | 10 years |  | 10 years
Technology |  |  |
Acquired Finite-lived Intangible Assets |  |  |
Original cost | $ 15,894 |  | $ 14,589
Accumulated amortization | (3,915) |  | (3,259)
Carrying value | $ 11,979 |  | $ 11,330
Weighted-average original life (in years) | 11 years |  | 11 years

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