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Goodwill and Other Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Summary of Changes in Carrying Amounts of Goodwill by Operating Segment | The table below summarizes the changes in the carrying amount of goodwill by reportable segment:
| Corporate Finance & Restructuring |  | Forensic and Litigation Consulting |  | Economic Consulting |  | Technology |  | Strategic Communications |  | Total
Balance at December 31, 2017 |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ | 454,816 |  |  | $ | 233,719 |  |  | $ | 268,995 |  |  | $ | 117,740 |  |  | $ | 323,672 |  |  | $ | 1,398,942 |
Accumulated goodwill impairment | — |  |  | — |  |  | — |  |  | — |  |  | (194,139 | ) |  | (194,139 | )
Goodwill, net at December 31, 2017 | 454,816 |  |  | 233,719 |  |  | 268,995 |  |  | 117,740 |  |  | 129,533 |  |  | 1,204,803 |
Foreign currency translation adjustment and other | (902 | ) |  | 1,244 |  |  | 294 |  |  | 60 |  |  | 2,512 |  |  | 3,208 |
Balance at March 31, 2018 |  |  |  |  |  |  |  |  |  |  |
Goodwill | 453,914 |  |  | 234,963 |  |  | 269,289 |  |  | 117,800 |  |  | 326,184 |  |  | 1,402,150 |
Accumulated goodwill impairment | — |  |  | — |  |  | — |  |  | — |  |  | (194,139 | ) |  | (194,139 | )
Goodwill, net at March 31, 2018 | $ | 453,914 |  |  | $ | 234,963 |  |  | $ | 269,289 |  |  | $ | 117,800 |  |  | $ | 132,045 |  |  | $ | 1,208,011 |
Schedule of Future Amortization Expense Intangible Assets | We estimate our future amortization expense for our intangible assets with finite lives to be as follows:
Year | As of March 31, 2018 (1)
2018 (remaining) | $ | 6,086 |
2019 | 7,702 |
2020 | 7,538 |
2021 | 6,900 |
2022 | 5,012 |
Thereafter | 3,552 |
| $ | 36,790 |
(1) | Actual amortization expense to be reported in future periods could differ from these estimates as a result of new intangible asset acquisitions, changes in useful lives or other relevant factors or changes.

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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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