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Segments Information - Summary of Adjusted EBITDA Business Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 29, 2018 | Jun. 30, 2019 | Jun. 29, 2018
Adjusted EBITDA attributable to Parsons Corporation |  |  |  |
Adjusted EBITDA attributable to Parsons Corporation | $ 76,225 | $ 50,876 | $ 144,500 | $ 97,786
Adjusted EBITDA attributable to noncontrolling interests | (20) | 1,759 | 3,729 | 5,679
Depreciation and amortization | (31,074) | (14,048) | (61,665) | (23,057)
Interest expense, net | (6,151) | (3,270) | (13,966) | (6,528)
Income tax (expense) benefit | 53,496 | (9,019) | 51,610 | (14,372)
Litigation-related gains | 0 | 132,004 | 0 | 129,674
Amortization of deferred gain resulting from sale-leaseback transactions | 0 | 1,829 | 0 | 3,642
Equity based compensation | (43,311) | (5,049) | (47,161) | (8,149)
Transaction-related costs | (7,715) | (4,930) | (17,070) | (5,055)
Restructuring | (353) |  | (2,571) | 0
HCM software implementation costs | (586) | (337) | (3,498) | (337)
Other | (366) | 223 | (377) | (143)
Net income including noncontrolling interests | 40,145 | 150,038 | 53,531 | 179,140
Net income attributable to noncontrolling interests | (114) | 1,657 | 3,531 | 5,472
Net income attributable to Parsons Corporation | 40,259 | 148,381 | 50,000 | 173,668
Federal Solution Segment |  |  |  |
Adjusted EBITDA attributable to Parsons Corporation |  |  |  |
Adjusted EBITDA attributable to Parsons Corporation | 35,700 | 33,948 | 76,299 | 55,496
Critical Infrastructure |  |  |  |
Adjusted EBITDA attributable to Parsons Corporation |  |  |  |
Adjusted EBITDA attributable to Parsons Corporation | $ 40,525 | $ 16,928 | $ 68,201 | $ 42,290

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