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Segment Reporting - Schedule of Operations by Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Segment Reporting, Other Significant Reconciling Item [Line Items]                      
Revenues $ 725,515 $ 589,989 $ 612,445 $ 568,360 $ 624,177 $ 523,711 $ 554,208 $ 530,738 $ 2,496,309 $ 2,232,834 $ 2,124,074
Total Operating Income 123,193 85,358 86,666 87,842 101,883 79,878 95,237 71,573 383,059 348,571 345,848
Other Income (Expense)                 (61,659) (34,194) 49,865
Income before Provision for Income Taxes                 321,400 314,377 395,713
Losses (Gains) on Asset Disposals and Impairments, Net:                 1,034 5,520 (3,532)
Equity in Income of Investees 11,945 $ 12,649 $ 12,568 $ 13,645 11,092 $ 14,783 $ 11,319 $ 8,779 50,807 45,973 33,498
Total Capital Expenditures                 151,286 198,312 311,052
Total Depreciation and Amortization                 78,566 73,842 69,080
Total Assets 2,747,065       2,618,939       2,747,065 2,618,939 2,501,380
Total Investment in Unconsolidated Affiliates 88,608       100,198       88,608 100,198 85,284
Reportable Segments                      
Segment Reporting, Other Significant Reconciling Item [Line Items]                      
Revenues                 2,497,681 2,235,841 2,132,179
Total Operating Income                 412,214 363,919 364,792
Total Capital Expenditures                 145,057 191,946 300,622
Total Depreciation and Amortization                 71,133 66,787 62,369
Total Assets 2,592,892       2,504,017       2,592,892 2,504,017 2,407,245
Reportable Segments | Government Operations                      
Segment Reporting, Other Significant Reconciling Item [Line Items]                      
Revenues                 2,031,337 1,808,483 1,725,097
Total Operating Income                 374,682 336,501 329,549
Losses (Gains) on Asset Disposals and Impairments, Net:                 1,043 (250) (8)
Equity in Income of Investees                 50,807 45,973 33,498
Total Capital Expenditures                 91,699 103,093 147,051
Total Depreciation and Amortization                 53,388 47,982 42,485
Total Assets 1,515,264       1,498,472       1,515,264 1,498,472 1,430,863
Total Investment in Unconsolidated Affiliates 88,608       100,198       88,608 100,198 85,284
Reportable Segments | Commercial Operations                      
Segment Reporting, Other Significant Reconciling Item [Line Items]                      
Revenues                 466,344 427,358 407,082
Total Operating Income                 37,532 27,418 35,243
Losses (Gains) on Asset Disposals and Impairments, Net:                 (9) 6,233 (2,548)
Equity in Income of Investees                 0 0 0
Total Capital Expenditures                 53,358 88,853 153,571
Total Depreciation and Amortization                 17,745 18,805 19,884
Total Assets 1,077,628       1,005,545       1,077,628 1,005,545 976,382
Total Investment in Unconsolidated Affiliates 0       0       0 0 0
Corporate                      
Segment Reporting, Other Significant Reconciling Item [Line Items]                      
Total Operating Income                 (29,155) (15,348) (18,944)
Losses (Gains) on Asset Disposals and Impairments, Net:                 0 (463) (976)
Total Capital Expenditures                 6,229 6,366 10,430
Total Depreciation and Amortization                 7,433 7,055 6,711
Total Assets $ 154,173       $ 114,922       154,173 114,922 94,135
Eliminations                      
Segment Reporting, Other Significant Reconciling Item [Line Items]                      
Revenues                 $ (1,372) $ (3,007) $ (8,105)