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Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Goodwill, Gross |  |  |  |  |
Balance, beginning of period |  |  | $ 58,397 |  |
Additions |  |  | 143,642 |  |
Purchase accounting adjustments |  |  | (1,865) |  |
Foreign currency fluctuations |  |  | 19,632 |  |
Balance, end of period | $ 219,806 |  | 219,806 |  | $ 58,397
Accumulated Impairment Losses |  |  |  |  |
Balance, beginning of period |  |  | (37,332) |  |
Foreign currency fluctuations |  |  | (3,426) |  |
Balance, end of period | (40,758) |  | (40,758) |  | (37,332)
Goodwill, Net |  |  |  |  |
Balance, beginning of period |  |  | 21,065 |  |
Additions |  |  | 143,642 |  |
Purchase accounting adjustments |  |  | (1,865) |  |
Foreign currency fluctuations |  |  | 16,206 |  |
Balance, end of period | 179,048 |  | 179,048 |  | 21,065
Acquired Finite-lived Intangible Assets |  |  |  |  |
Original cost | 193,522 |  | 193,522 |  | 15,152
Accumulated amortization | (17,770) |  | (17,770) |  | (8,692)
Intangible Assets, Net | 175,752 |  | 175,752 |  | 6,460
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 159,445 |  | 159,445 |  |
Purchase of Intangible Assets |  |  | $ 2,500 | $ 0 |
Finite-Lived Intangible Asset, Useful Life |  |  | 5 years |  |
Amortization expense | 7,650 | $ 99 | $ 11,430 | $ 323 |
Estimated aggregate amortization expense of Intangible Assets |  |  |  |  |
Remaining 2017 | 5,635 |  | 5,635 |  |
2018 | 22,042 |  | 22,042 |  |
2019 | 21,398 |  | 21,398 |  |
2020 | 19,928 |  | 19,928 |  |
2021 | 18,315 |  | 18,315 |  |
Thereafter | 88,434 |  | 88,434 |  |
Total | 175,752 |  | 175,752 |  |
Customer Lists |  |  |  |  |
Acquired Finite-lived Intangible Assets |  |  |  |  |
Original cost | 147,582 |  | 147,582 |  | 8,016
Accumulated amortization | (13,492) |  | (13,492) |  | (5,948)
Intangible Assets, Net | 134,090 |  | $ 134,090 |  | $ 2,068
Weighted-average original life |  |  | 15 years |  | 15 years
Trade Names |  |  |  |  |
Acquired Finite-lived Intangible Assets |  |  |  |  |
Original cost | 31,515 |  | $ 31,515 |  | $ 2,000
Accumulated amortization | (1,631) |  | (1,631) |  | 0
Intangible Assets, Net | 29,884 |  | $ 29,884 |  | $ 2,000
Weighted-average original life |  |  | 10 years |  | 15 years
Technology |  |  |  |  |
Acquired Finite-lived Intangible Assets |  |  |  |  |
Original cost | 14,425 |  | $ 14,425 |  | $ 5,136
Accumulated amortization | (2,647) |  | (2,647) |  | (2,744)
Intangible Assets, Net | $ 11,778 |  | $ 11,778 |  | $ 2,392
Weighted-average original life |  |  | 11 years |  | 13 years

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