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Goodwill and Other Intangible Assets | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Other Intangible Assets | Goodwill and Other Intangible Assets Goodwill 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, 2015 |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ | 441,548 |  |  | $ | 235,211 |  |  | $ | 269,341 |  |  | $ | 117,888 |  |  | $ | 328,449 |  |  | $ | 1,392,437 |
Accumulated goodwill impairment | — |  |  | — |  |  | — |  |  | — |  |  | (194,139 | ) |  | (194,139 | )
Goodwill, net at December 31, 2015 | 441,548 |  |  | 235,211 |  |  | 269,341 |  |  | 117,888 |  |  | 134,310 |  |  | 1,198,298 |
Acquisitions (1) | — |  |  | — |  |  | — |  |  | — |  |  | 218 |  |  | 218 |
Foreign currency translation adjustment and other | (882 | ) |  | (4,667 | ) |  | (1,132 | ) |  | (281 | ) |  | (11,553 | ) |  | (18,515 | )
Balance at December 31, 2016 |  |  |  |  |  |  |  |  |  |  |
Goodwill | 440,666 |  |  | 230,544 |  |  | 268,209 |  |  | 117,607 |  |  | 317,114 |  |  | 1,374,140 |
Accumulated goodwill impairment | — |  |  | — |  |  | — |  |  | — |  |  | (194,139 | ) |  | (194,139 | )
Goodwill, net at December 31, 2016 | 440,666 |  |  | 230,544 |  |  | 268,209 |  |  | 117,607 |  |  | 122,975 |  |  | 1,180,001 |
Acquisitions (2) | 11,900 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 11,900 |
Foreign currency translation adjustment and other | 2,250 |  |  | 3,175 |  |  | 786 |  |  | 133 |  |  | 6,558 |  |  | 12,902 |
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 |
(1) | Includes adjustments during the purchase price allocation period.
(2) | During the year ended December 31, 2017, we made an initial payment of $8.9 million at closing to acquire a restructuring business within our Corporate Finance & Restructuring segment. We recorded $11.9 million in goodwill as a result of the acquisition. We have included the results of the acquired business' operations in the Corporate Finance & Restructuring segment since its acquisition date.
Other Intangible Assets Other intangible assets were as follows:
|  |  | December 31, 2017 |  | December 31, 2016
| Weighted Average Useful Life in Years |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Amortizing intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships | 13.7 |  | $ | 117,192 |  |  | $ | 80,523 |  |  | $ | 36,669 |  |  | $ | 119,736 |  |  | $ | 75,212 |  |  | $ | 44,524 |
Non-competition agreements (1) | N/A |  | — |  |  | — |  |  | — |  |  | 1,263 |  |  | 1,246 |  |  | 17 |
Acquired software | 9.8 |  | 3,264 |  |  | 1,383 |  |  | 1,881 |  |  | 3,171 |  |  | 1,292 |  |  | 1,879 |
Trade names (1) | N/A |  | — |  |  | — |  |  | — |  |  | 360 |  |  | 260 |  |  | 100 |
| 13.6 |  | 120,456 |  |  | 81,906 |  |  | 38,550 |  |  | 124,530 |  |  | 78,010 |  |  | 46,520 |
Non-amortizing intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |
Trade names | Indefinite |  | 5,600 |  |  | — |  |  | 5,600 |  |  | 5,600 |  |  | — |  |  | 5,600 |
Total |  |  | $ | 126,056 |  |  | $ | 81,906 |  |  | $ | 44,150 |  |  | $ | 130,130 |  |  | $ | 78,010 |  |  | $ | 52,120 |
(1) | These intangible assets were fully amortized and written off during the year ended December 31, 2017.
Other intangible assets with finite lives are amortized over their estimated useful lives. We recorded amortization expense of $10.6 million, $10.3 million and $11.7 million during the years ended December 31, 2017, 2016 and 2015, respectively. We estimate our future amortization expense for our intangible assets with a finite life to be as follows:
| As of December 31, 2017 (1)
Year
2018 | $ | 8,252 |
2019 | 7,589 |
2020 | 7,413 |
2021 | 6,797 |
2022 | 4,973 |
Thereafter | 3,526 |
| $ | 38,550 |
(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 The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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