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Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Goodwill, Gross |  |  |  |  |
Balance, beginning of period |  |  | $ 227,224 |  |
Purchase accounting adjustments |  |  | 4,627 |  |
Foreign currency fluctuations |  |  | (7,542) |  |
Balance, end of period | $ 224,309 |  | 224,309 |  | $ 227,224
Accumulated Impairment Losses |  |  |  |  |
Balance, beginning of period |  |  | (41,180) |  |
Foreign currency fluctuations |  |  | 1,490 |  |
Balance, end of period | (39,690) |  | (39,690) |  | (41,180)
Goodwill, Net |  |  |  |  |
Balance, beginning of period |  |  | 186,044 |  |
Purchase accounting adjustments |  |  | 4,627 |  |
Foreign currency fluctuations |  |  | (6,052) |  |
Balance, end of period | 184,619 |  | 184,619 |  | 186,044
Acquired Finite-lived Intangible Assets |  |  |  |  |
Original cost | 192,839 |  | 192,839 |  | 195,912
Accumulated amortization | (39,865) |  | (39,865) |  | (23,565)
Carrying value | 152,974 |  | 152,974 |  | 172,347
Purchase of Intangible Assets |  |  | 2,607 | $ 2,500 |
Amortization expense | 5,720 | $ 7,650 | 17,378 | $ 11,430 |
Estimated aggregate amortization expense of Intangible Assets |  |  |  |  |
Remaining 2018 | 5,456 |  | 5,456 |  |
2019 | 21,268 |  | 21,268 |  |
2020 | 19,827 |  | 19,827 |  |
2021 | 18,244 |  | 18,244 |  |
2022 | 15,965 |  | 15,965 |  |
Thereafter | 72,214 |  | 72,214 |  |
Total | 152,974 |  | 152,974 |  |
Customer Lists |  |  |  |  |
Acquired Finite-lived Intangible Assets |  |  |  |  |
Original cost | 144,760 |  | 144,760 |  | 149,355
Accumulated amortization | (29,908) |  | (29,908) |  | (17,870)
Carrying value | 114,852 |  | $ 114,852 |  | $ 131,485
Weighted-average original life (in years) |  |  | 15 years |  | 15 years
Trade Names |  |  |  |  |
Acquired Finite-lived Intangible Assets |  |  |  |  |
Original cost | 30,945 |  | $ 30,945 |  | $ 31,968
Accumulated amortization | (4,631) |  | (4,631) |  | (2,436)
Carrying value | 26,314 |  | $ 26,314 |  | $ 29,532
Weighted-average original life (in years) |  |  | 10 years |  | 10 years
Technology |  |  |  |  |
Acquired Finite-lived Intangible Assets |  |  |  |  |
Original cost | 17,134 |  | $ 17,134 |  | $ 14,589
Accumulated amortization | (5,326) |  | (5,326) |  | (3,259)
Carrying value | $ 11,808 |  | $ 11,808 |  | $ 11,330
Weighted-average original life (in years) |  |  | 11 years |  | 11 years
Purchase of Intangible Assets |  |  | $ 2,500 |  |

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