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Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Goodwill, Gross |  |  |  |  |
Balance, beginning of period |  |  | $ 227,224 |  |
Purchase accounting adjustments |  |  | 4,627 |  |
Foreign currency fluctuations |  |  | (6,089) |  |
Balance, end of period | $ 225,762 |  | 225,762 |  | $ 227,224
Accumulated Impairment Losses |  |  |  |  |
Balance, beginning of period |  |  | (41,180) |  |
Foreign currency fluctuations |  |  | 1,133 |  |
Balance, end of period | (40,047) |  | (40,047) |  | (41,180)
Goodwill, Net |  |  |  |  |
Balance, beginning of period |  |  | 186,044 |  |
Purchase accounting adjustments |  |  | 4,627 |  |
Foreign currency fluctuations |  |  | (4,956) |  |
Balance, end of period | 185,715 |  | 185,715 |  | 186,044
Acquired Finite-lived Intangible Assets |  |  |  |  |
Original cost | 192,114 |  | 192,114 |  | 195,912
Accumulated amortization | (34,440) |  | (34,440) |  | (23,565)
Carrying value | 157,674 |  | 157,674 |  | 172,347
Purchase of Intangible Assets |  |  | 1,195 | $ 2,500 |
Amortization expense | 5,819 | $ 3,536 | 11,657 | $ 3,780 |
Estimated aggregate amortization expense of Intangible Assets |  |  |  |  |
Remaining 2018 | 10,854 |  | 10,854 |  |
2019 | 21,206 |  | 21,206 |  |
2020 | 19,756 |  | 19,756 |  |
2021 | 18,165 |  | 18,165 |  |
2022 | 16,020 |  | 16,020 |  |
Thereafter | 71,673 |  | 71,673 |  |
Total | 157,674 |  | 157,674 |  |
Customer Lists |  |  |  |  |
Acquired Finite-lived Intangible Assets |  |  |  |  |
Original cost | 145,455 |  | 145,455 |  | 149,355
Accumulated amortization | (25,990) |  | (25,990) |  | (17,870)
Carrying value | 119,465 |  | $ 119,465 |  | $ 131,485
Weighted-average original life (in years) |  |  | 15 years |  | 15 years
Trade Names |  |  |  |  |
Acquired Finite-lived Intangible Assets |  |  |  |  |
Original cost | 31,105 |  | $ 31,105 |  | $ 31,968
Accumulated amortization | (3,894) |  | (3,894) |  | (2,436)
Carrying value | 27,211 |  | $ 27,211 |  | $ 29,532
Weighted-average original life (in years) |  |  | 10 years |  | 10 years
Technology |  |  |  |  |
Acquired Finite-lived Intangible Assets |  |  |  |  |
Original cost | 15,554 |  | $ 15,554 |  | $ 14,589
Accumulated amortization | (4,556) |  | (4,556) |  | (3,259)
Carrying value | $ 10,998 |  | $ 10,998 |  | $ 11,330
Weighted-average original life (in years) |  |  | 11 years |  | 11 years
Purchase of Intangible Assets |  |  | $ 1,000 |  |

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