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Goodwill and Other Intangible Assets | 12 Months Ended
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Dec. 31, 2018
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, 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 (1) | 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 |
Sale of business (2) | — |  |  | — |  |  | — |  |  | (20,928 | ) |  | — |  |  | (20,928 | )
Foreign currency translation adjustment and other | (3,819 | ) |  | (2,182 | ) |  | (448 | ) |  | (89 | ) |  | (5,021 | ) |  | (11,559 | )
Balance at December 31, 2018 |  |  |  |  |  |  |  |  |  |  |
Goodwill | 450,997 |  |  | 231,537 |  |  | 268,547 |  |  | 96,723 |  |  | 318,651 |  |  | 1,366,455 |
Accumulated goodwill impairment | — |  |  | — |  |  | — |  |  | — |  |  | (194,139 | ) |  | (194,139 | )
Goodwill, net at December 31, 2018 | $ | 450,997 |  |  | $ | 231,537 |  |  | $ | 268,547 |  |  | $ | 96,723 |  |  | $ | 124,512 |  |  | $ | 1,172,316 |
(1) | 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 the acquisition date.
(2) | During the year ended December 31, 2018, we sold a business within our Technology segment for proceeds of $50.3 million. We wrote off $20.9 million in goodwill as a result of the sale.
Other Intangible Assets Other intangible assets were as follows:
|  |  | December 31, 2018 |  | December 31, 2017
| 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 (1) | 14.3 |  | $ | 99,080 |  |  | $ | 71,036 |  |  | $ | 28,044 |  |  | $ | 117,192 |  |  | $ | 80,523 |  |  | $ | 36,669 |
Acquired software | 9.8 |  | 3,107 |  |  | 1,618 |  |  | 1,489 |  |  | 3,264 |  |  | 1,383 |  |  | 1,881 |
| 14.2 |  | 102,187 |  |  | 72,654 |  |  | 29,533 |  |  | 120,456 |  |  | 81,906 |  |  | 38,550 |
Non-amortizing intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |
Trade names (1) | Indefinite |  | 5,100 |  |  | — |  |  | 5,100 |  |  | 5,600 |  |  | — |  |  | 5,600 |
Total |  |  | $ | 107,287 |  |  | $ | 72,654 |  |  | $ | 34,633 |  |  | $ | 126,056 |  |  | $ | 81,906 |  |  | $ | 44,150 |
(1) | During the year ended December 31, 2018, we sold a business and related intangible assets within our Technology segment.
Other intangible assets with finite lives are amortized over their estimated useful lives. We recorded amortization expense of $8.2 million, $10.6 million and $10.3 million during the years ended December 31, 2018, 2017 and 2016, respectively. We estimate our future amortization expense for our intangible assets with a finite life to be as follows:
| As of December 31, 2018 (1)
Year
2019 | $ | 7,291 |
2020 | 7,176 |
2021 | 6,657 |
2022 | 4,913 |
2023 | 1,693 |
Thereafter | 1,803 |
| $ | 29,533 |
(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 goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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