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Segment Information - Summary of Adjusted EBITDA Business Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 28, 2018 | Sep. 30, 2019 | Sep. 28, 2018
Adjusted EBITDA attributable to Parsons Corporation |  |  |  |
Adjusted EBITDA attributable to Parsons Corporation | $ 84,335 | $ 83,562 | $ 228,835 | $ 181,348
Adjusted EBITDA attributable to noncontrolling interests | 4,655 | 5,002 | 8,384 | 10,681
Depreciation and amortization | (31,027) | (23,599) | (92,692) | (46,656)
Interest expense, net | (4,482) | (5,589) | (18,448) | (12,117)
Income tax (expense) benefit | 15,453 | (4,154) | 67,063 | (18,526)
Litigation-related gains | 0 |  | 0 | 129,674
Amortization of deferred gain resulting from sale-leaseback transactions | 0 | 1,798 | 0 | 5,440
Equity-based compensation | 1,657 | (5,049) | (45,504) | (13,198)
Transaction-related costs | (9,891) | (2,456) | (26,961) | (7,511)
Restructuring | (309) |  | (2,880) | 0
Other | 902 | (3,449) | (2,973) | (3,929)
Net income including noncontrolling interests | 61,293 | 46,066 | 114,824 | 225,206
Net income attributable to noncontrolling interests | 4,481 | 4,844 | 8,012 | 10,316
Net income attributable to Parsons Corporation | 56,812 | 41,222 | 106,812 | 214,890
Federal Solution Segment |  |  |  |
Adjusted EBITDA attributable to Parsons Corporation |  |  |  |
Adjusted EBITDA attributable to Parsons Corporation | 50,359 | 45,556 | 126,658 | 101,052
Critical Infrastructure |  |  |  |
Adjusted EBITDA attributable to Parsons Corporation |  |  |  |
Adjusted EBITDA attributable to Parsons Corporation | $ 33,976 | $ 38,006 | $ 102,177 | $ 80,296

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