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Segment Reporting - Schedule of Operating Results by Segment (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2022
USD ($)
Sep. 30, 2022
USD ($)
Jun. 30, 2022
USD ($)
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Sep. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2022
USD ($)
segment
Dec. 31, 2021
USD ($)
segment
Dec. 31, 2020
USD ($)
Segment Reporting, Other Significant Reconciling Item [Line Items]                      
Number of reportable segments | segment                 2 3  
Revenues $ 624,177 $ 523,711 $ 554,208 $ 530,738 $ 591,975 $ 498,727 $ 505,099 $ 528,273 $ 2,232,834 $ 2,124,074 $ 2,123,516
Operating income 101,883 79,878 95,237 71,573 102,215 87,468 73,751 82,414 348,571 345,848 358,552
Other Income (Expense)                 (34,194) 49,865 3,620
Total before tax                 314,377 395,713 362,172
Losses (Gains) on Asset Disposals and Impairments, Net:                 5,520 (3,532) (1,361)
Equity in Income of Investees 11,092 $ 14,783 $ 11,319 $ 8,779 7,301 $ 10,618 $ 7,263 $ 8,316 45,973 33,498 27,152
Total Capital Expenditures                 198,312 311,052 255,027
Total Depreciation and Amortization                 73,842 69,080 60,674
Total Assets 2,618,939       2,501,380       2,618,939 2,501,380 2,293,503
Total Investment in Unconsolidated Affiliates 100,198       85,284       100,198 85,284 71,806
Government Operations                      
Segment Reporting, Other Significant Reconciling Item [Line Items]                      
Revenues                 1,808,483 1,725,097 1,763,127
Commercial Operations                      
Segment Reporting, Other Significant Reconciling Item [Line Items]                      
Revenues                 427,358 407,082 371,269
Reportable Segments                      
Segment Reporting, Other Significant Reconciling Item [Line Items]                      
Revenues                 2,235,841 2,132,179 2,134,396
Operating income                 363,919 364,792 382,165
Total Capital Expenditures                 191,946 300,622 243,811
Total Depreciation and Amortization                 66,787 62,369 53,829
Total Assets 2,504,017       2,407,245       2,504,017 2,407,245 2,183,348
Reportable Segments | Government Operations                      
Segment Reporting, Other Significant Reconciling Item [Line Items]                      
Revenues                 1,808,483 1,725,097 1,763,127
Operating income                 336,501 329,549 345,250
Losses (Gains) on Asset Disposals and Impairments, Net:                 (250) (8) 320
Equity in Income of Investees                 45,973 33,498 27,152
Total Capital Expenditures                 103,093 147,051 137,197
Total Depreciation and Amortization                 47,982 42,485 35,398
Total Assets 1,498,472       1,430,863       1,498,472 1,430,863 1,353,122
Total Investment in Unconsolidated Affiliates 100,198       85,284       100,198 85,284 71,806
Reportable Segments | Commercial Operations                      
Segment Reporting, Other Significant Reconciling Item [Line Items]                      
Revenues                 427,358 407,082 371,269
Operating income                 27,418 35,243 36,915
Losses (Gains) on Asset Disposals and Impairments, Net:                 6,233 (2,548) (1,681)
Equity in Income of Investees                 0 0 0
Total Capital Expenditures                 88,853 153,571 106,614
Total Depreciation and Amortization                 18,805 19,884 18,431
Total Assets 1,005,545       976,382       1,005,545 976,382 830,226
Total Investment in Unconsolidated Affiliates $ 0       $ 0       0 0 0
Eliminations                      
Segment Reporting, Other Significant Reconciling Item [Line Items]                      
Revenues                 (3,007) (8,105) (10,880)
Operating income                 (15,348) (18,944) (23,613)
Losses (Gains) on Asset Disposals and Impairments, Net:                 (463) (976) 0
Eliminations | Government Operations                      
Segment Reporting, Other Significant Reconciling Item [Line Items]                      
Revenues                 (2,941) (7,327) (10,327)
Eliminations | Commercial Operations                      
Segment Reporting, Other Significant Reconciling Item [Line Items]                      
Revenues                 $ (66) $ (778) $ (553)