v3.25.4
Segment Reporting - Schedule of Operations by Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2025
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Segment Reporting, Other Significant Reconciling Item [Line Items]                      
Revenues $ 885,842 $ 866,286 $ 764,039 $ 682,258 $ 746,267 $ 671,956 $ 681,465 $ 603,966 $ 3,198,425 $ 2,703,654 $ 2,496,309
Research and development costs                 13,867 7,478 7,613
Total Operating Income                 404,459 380,607 383,059
Total Other Income (Expense)                 (6,339) (31,887) (61,659)
Total before tax                 398,120 348,720 321,400
Equity in Income of Investees $ 18,562 $ 21,216 $ 18,545 $ 16,588 $ 15,612 $ 15,532 $ 11,584 $ 13,203 74,911 55,931 50,807
Total Capital Expenditures                 184,557 153,647 151,286
Total Depreciation and Amortization                 109,186 85,862 78,566
Government Operations                      
Segment Reporting, Other Significant Reconciling Item [Line Items]                      
Total Costs and Expenses                 2,028,067 1,861,096 1,707,462
Commercial Operations                      
Segment Reporting, Other Significant Reconciling Item [Line Items]                      
Total Costs and Expenses                 797,610 477,156 428,812
Reportable Segments                      
Segment Reporting, Other Significant Reconciling Item [Line Items]                      
Revenues                 3,203,160 2,707,012 2,497,681
Total Costs and Expenses                 2,825,677 2,338,252 2,136,274
Total Operating Income                 452,578 424,691 412,214
Total Capital Expenditures                 175,526 143,836 145,057
Total Depreciation and Amortization                 102,003 78,735 71,133
Reportable Segments | Government Operations                      
Segment Reporting, Other Significant Reconciling Item [Line Items]                      
Revenues                 2,350,090 2,183,040 2,031,337
Research and development costs                 8,360 6,306 6,459
Losses (Gains) on Asset Disposals and Impairments, Net                 (4,973) 2,462 1,043
Other Segment Expenses                 2,024,680 1,852,328 1,699,960
Total Operating Income                 394,850 377,875 374,682
Equity in Income of Investees                 72,642 55,931 50,807
Total Capital Expenditures                 98,445 81,063 91,699
Total Depreciation and Amortization                 75,202 61,027 53,388
Reportable Segments | Commercial Operations                      
Segment Reporting, Other Significant Reconciling Item [Line Items]                      
Revenues                 853,070 523,972 466,344
Research and development costs                 5,507 1,172 1,154
Losses (Gains) on Asset Disposals and Impairments, Net                 1 57 (9)
Other Segment Expenses                 792,102 475,927 427,667
Total Operating Income                 57,728 46,816 37,532
Equity in Income of Investees                 2,269 0 0
Total Capital Expenditures                 77,081 62,773 53,358
Total Depreciation and Amortization                 26,801 17,708 17,745
Eliminations                      
Segment Reporting, Other Significant Reconciling Item [Line Items]                      
Revenues                 (4,735) (3,358) (1,372)
Corporate                      
Segment Reporting, Other Significant Reconciling Item [Line Items]                      
Total Operating Income                 (48,119) (44,084) (29,155)
Total Capital Expenditures                 9,031 9,811 6,229
Total Depreciation and Amortization                 7,183 7,127 7,433
Gain (loss) on disposition of assets                 $ (0) $ 1,900 $ (0)