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Segment Information - Summary of Adjusted EBITDA Business Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Adjusted EBITDA attributable to Parsons Corporation |  |
Adjusted EBITDA attributable to Parsons Corporation | $ 63,639 | $ 58,974
Adjusted EBITDA attributable to noncontrolling interests | 5,060 | 1,522
Depreciation and amortization | (34,673) | (32,409)
Interest expense, net | (4,443) | (3,794)
Income tax expense | (5,375) | (5,084)
Equity-based compensation income (expense) | (6,980) | 7,721
Transaction-related costs | (2,646) | (12,011)
Restructuring expense | (77) | 33
Other | (491) | (581)
Net income including noncontrolling interests | 14,014 | 14,371
Net income attributable to noncontrolling interests | 4,975 | 1,398
Net income attributable to Parsons Corporation | 9,039 | 12,973
Federal Solution Segment |  |
Adjusted EBITDA attributable to Parsons Corporation |  |
Adjusted EBITDA attributable to Parsons Corporation | 31,982 | 31,617
Critical Infrastructure |  |
Adjusted EBITDA attributable to Parsons Corporation |  |
Adjusted EBITDA attributable to Parsons Corporation | $ 31,657 | $ 27,357

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