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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in the carrying amount of Goodwill | The changes in the carrying amount of Goodwill are as follows:
| Goodwill |  | Accumulated Impairment Losses |  | Total
Balance as of December 31, 2015 | $ | 60,447 |  |  | $ | (43,644 | ) |  | $ | 16,803 |
Additions | 3,787 |  |  | — |  |  | 3,787 |
Foreign currency fluctuations | (5,837 | ) |  | 6,312 |  |  | 475 |
Balance as of December 31, 2016 | $ | 58,397 |  |  | $ | (37,332 | ) |  | $ | 21,065 |
Additions | 147,845 |  |  | — |  |  | 147,845 |
Purchase accounting adjustments | (1,865 | ) |  | — |  |  | (1,865 | )
Foreign currency fluctuations | 22,847 |  |  | (3,848 | ) |  | 18,999 |
Balance as of December 31, 2017 | $ | 227,224 |  |  | $ | (41,180 | ) |  | $ | 186,044 |
Acquired Intangible Assets excluding Goodwill | The balances of acquired Intangible Assets, excluding Goodwill, as of December 31, are as follows:
| Customer Lists |  | Trade Names |  | Technology |  | Total
Balance as of December 31, 2017 |  |  |  |  |  |  |
Original cost | $ | 149,355 |  |  | $ | 31,968 |  |  | $ | 14,589 |  |  | $ | 195,912 |
Accumulated amortization | (17,870 | ) |  | (2,436 | ) |  | (3,259 | ) |  | (23,565 | )
Carrying amount | $ | 131,485 |  |  | $ | 29,532 |  |  | $ | 11,330 |  |  | $ | 172,347 |
Weighted-average original life (in years) | 15 |  |  | 10 |  |  | 11 |  |  |  |
Balance as of December 31, 2016 |  |  |  |  |  |  |  |  |  |  |
Original cost | $ | 8,016 |  |  | $ | 2,000 |  |  | $ | 5,136 |  |  | $ | 15,152 |
Accumulated amortization | (5,948 | ) |  | — |  |  | (2,744 | ) |  | (8,692 | )
Carrying amount | $ | 2,068 |  |  | $ | 2,000 |  |  | $ | 2,392 |  |  | $ | 6,460 |
Weighted-average original life (in years) | 15 |  |  | 15 |  |  | 13 |  |  |  |
Estimated aggregate amortization expense of Intangible Assets | Estimated aggregate amortization expense based on the current carrying amount of amortizable Intangible Assets for each of the five succeeding years is as follows:
2018 | $ | 22,345 |
2019 | 21,691 |
2020 | 20,198 |
2021 | 18,561 |
2022 | 16,367 |
Thereafter | 73,185 |
Total | $ | 172,347 |

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- Definition Tabular disclosure of the characteristics, including initial carrying value, residual amount, weighted average useful life, of finite-lived intangible assets acquired during the period by major class. A major class is composed of intangible assets that can be grouped together because they are similar, either by nature or by their use in the operations of the company. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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