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Segment Reporting - Schedule of Operating Results by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Segment Reporting, Other Significant Reconciling Item [Line Items]        
Revenues $ 764,039 $ 681,465 $ 1,446,297 $ 1,285,431
Research and Development Costs 4,565 1,271 6,578 2,761
(Gains) Losses on asset disposals and impairments - net (13) 4 4,418 4
Total Operating Income 102,424 98,806 199,054 191,767
Other Income (Expense) (4,665) (7,177) (9,478) (11,761)
Income before Provision for Income Taxes 97,759 91,629 189,576 180,006
Equity in Income of Investees: 18,545 11,584 35,133 24,787
CAPITAL EXPENDITURES: 32,729 27,760 66,098 60,826
Total Depreciation and Amortization 27,259 21,608 51,171 42,160
Government Operations        
Segment Reporting, Other Significant Reconciling Item [Line Items]        
Total Costs and Expenses 497,903 459,910 972,032 874,548
Commercial Operations        
Segment Reporting, Other Significant Reconciling Item [Line Items]        
Total Costs and Expenses 169,446 124,862 291,290 233,310
Operating Segments        
Segment Reporting, Other Significant Reconciling Item [Line Items]        
Revenues 765,098 682,337 1,448,695 1,286,496
Total Costs and Expenses 667,349 584,772 1,263,322 1,107,858
Total Operating Income 116,294 109,148 220,505 203,425
CAPITAL EXPENDITURES: 32,471 27,933 64,180 59,664
Total Depreciation and Amortization 25,465 19,827 47,580 38,505
Operating Segments | Government Operations        
Segment Reporting, Other Significant Reconciling Item [Line Items]        
Revenues 588,959 540,846 1,144,246 1,027,967
Research and Development Costs 1,924 1,156 3,375 2,603
(Gains) Losses on asset disposals and impairments - net 0 2 4,431 2
Other Segment Expenses 495,979 458,756 973,088 871,947
Total Operating Income 109,417 92,520 207,163 178,206
Equity in Income of Investees: 18,362 11,584 34,950 24,787
CAPITAL EXPENDITURES: 15,770 14,378 34,270 30,584
Total Depreciation and Amortization 19,222 15,430 37,318 29,664
Operating Segments | Commercial Operations        
Segment Reporting, Other Significant Reconciling Item [Line Items]        
Revenues 176,139 141,491 304,449 258,529
Research and Development Costs 2,641 115 3,203 158
(Gains) Losses on asset disposals and impairments - net (13) 2 (13) 2
Other Segment Expenses 166,792 124,749 288,074 233,154
Total Operating Income 6,877 16,628 13,342 25,219
Equity in Income of Investees: 183 0 183 0
CAPITAL EXPENDITURES: 16,701 13,555 29,910 29,080
Total Depreciation and Amortization 6,243 4,397 10,262 8,841
Eliminations        
Segment Reporting, Other Significant Reconciling Item [Line Items]        
Revenues (1,059) (872) (2,398) (1,065)
Unallocated Corporate        
Segment Reporting, Other Significant Reconciling Item [Line Items]        
Total Operating Income (13,870) (10,342) (21,451) (11,658)
CAPITAL EXPENDITURES: 258 (173) 1,918 1,162
Total Depreciation and Amortization $ 1,794 $ 1,781 $ 3,591 $ 3,655