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Segment Reporting - Revenues and Adjusted Segment Earnings before Interest, Taxes, Depreciation and Amortization for Reportable Segments (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Segment Reporting Information [Line Items] |  |
Revenues | $ 604,593 | $ 551,274
Adjusted Segment EBITDA | 106,124 | 117,490
Corporate Finance |  |
Segment Reporting Information [Line Items] |  |
Revenues | 207,749 | 160,966
Adjusted Segment EBITDA | 48,946 | 37,361
FLC |  |
Segment Reporting Information [Line Items] |  |
Revenues | 147,597 | 138,997
Adjusted Segment EBITDA | 21,208 | 31,817
Economic Consulting |  |
Segment Reporting Information [Line Items] |  |
Revenues | 132,138 | 142,271
Adjusted Segment EBITDA | 12,710 | 24,040
Technology |  |
Segment Reporting Information [Line Items] |  |
Revenues | 58,723 | 51,336
Adjusted Segment EBITDA | 14,484 | 12,723
Strategic Communications |  |
Segment Reporting Information [Line Items] |  |
Revenues | 58,386 | 57,704
Adjusted Segment EBITDA | $ 8,776 | $ 11,549

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- Definition Segment's share of consolidated operating income before depreciation, amortization of intangible assets, remeasurement of acquisition-related contingent consideration, special charges and goodwill impairment charges. + References No definition available. + Details
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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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