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Business Segments - Financial information by segment (Details) $ in Thousands |  | 3 Months Ended
--- | --- | ---
Sep. 30, 2023 USD ($) | Dec. 31, 2023 USD ($) segment | Dec. 31, 2022 USD ($)
Financial information for each of the Company's business segments |  |  |
Number of operating segments | segment |  | 3 |
Revenue: |  |  |
Revenue |  | $ 1,327,041 | $ 1,249,246
Gross profit: |  |  |
Gross profit |  | $ 300,054 | $ 244,747
Gross profit (as a percent) |  | 22.60% | 19.60%
Selling, general, and administrative expenses: |  |  |
Selling, general, and administrative expenses |  | $ 169,195 | $ 146,452
Selling, general, and administrative expense (as a percent) |  | 12.70% | 11.70%
Divestiture-related charges |  | $ 1,018 | $ 0
Impairment charges | $ 2,900 |  |
Operating income: |  |  |
Operating income |  | $ 107,510 | $ 74,777
Operating income (as a percent) |  | 8.10% | 6.00%
Amortization of intangible assets |  | $ (23,349) | $ (23,518)
Segment Reconciling Items |  |  |
Selling, general, and administrative expenses: |  |  |
Selling, general, and administrative expenses |  | 2,881 | 572
Divestiture-related charges |  | 1,018 | 0
Operating income: |  |  |
Amortization of intangible assets |  | (23,349) | (23,518)
Other |  | (2,881) | (572)
U.S. Federal Services | Operating Segments |  |  |
Revenue: |  |  |
Revenue |  | 677,078 | 618,167
Gross profit: |  |  |
Gross profit |  | $ 156,662 | $ 122,694
Gross profit (as a percent) |  | 23.10% | 19.80%
Selling, general, and administrative expenses: |  |  |
Selling, general, and administrative expenses |  | $ 87,855 | $ 71,649
Selling, general, and administrative expense (as a percent) |  | 13.00% | 11.60%
Operating income: |  |  |
Operating income |  | $ 68,807 | $ 51,045
Operating income (as a percent) |  | 10.20% | 8.30%
U.S. Services | Operating Segments |  |  |
Revenue: |  |  |
Revenue |  | $ 489,845 | $ 439,478
Gross profit: |  |  |
Gross profit |  | $ 118,363 | $ 83,598
Gross profit (as a percent) |  | 24.20% | 19.00%
Selling, general, and administrative expenses: |  |  |
Selling, general, and administrative expenses |  | $ 52,300 | $ 45,842
Selling, general, and administrative expense (as a percent) |  | 10.70% | 10.40%
Operating income: |  |  |
Operating income |  | $ 66,063 | $ 37,756
Operating income (as a percent) |  | 13.50% | 8.60%
Outside the U.S. | Operating Segments |  |  |
Revenue: |  |  |
Revenue |  | $ 160,118 | $ 191,601
Gross profit: |  |  |
Gross profit |  | $ 25,029 | $ 38,455
Gross profit (as a percent) |  | 15.60% | 20.10%
Selling, general, and administrative expenses: |  |  |
Selling, general, and administrative expenses |  | $ 25,141 | $ 28,389
Selling, general, and administrative expense (as a percent) |  | 15.70% | 14.80%
Operating income: |  |  |
Operating income |  | $ (112) | $ 10,066
Operating income (as a percent) |  | (0.10%) | 5.30%

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