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Segment Reporting - Schedule of Segment Reporting Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Segment Reporting Information [Line Items]                      
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
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
Government Operations                      
Segment Reporting Information [Line Items]                      
Revenues                 1,808,483 1,725,097 1,763,127
Commercial Operations                      
Segment Reporting Information [Line Items]                      
Revenues                 427,358 407,082 371,269
Reportable Segments                      
Segment Reporting Information [Line Items]                      
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
Revenues                 2,235,841 2,132,179 2,134,396
Reportable Segments | Government Operations                      
Segment Reporting Information [Line Items]                      
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
Revenues                 1,808,483 1,725,097 1,763,127
Reportable Segments | Commercial Operations                      
Segment Reporting Information [Line Items]                      
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
Revenues                 427,358 407,082 371,269
Eliminations                      
Segment Reporting Information [Line Items]                      
Losses (Gains) on Asset Disposals and Impairments, Net:                 (463) (976) 0
Revenues                 (3,007) (8,105) (10,880)
Eliminations | Government Operations                      
Segment Reporting Information [Line Items]                      
Revenues                 (2,941) (7,327) (10,327)
Eliminations | Commercial Operations                      
Segment Reporting Information [Line Items]                      
Revenues                 (66) (778) (553)
Corporate                      
Segment Reporting Information [Line Items]                      
Total Capital Expenditures                 6,366 10,430 11,216
Total Depreciation and Amortization                 7,055 6,711 6,845
Total Assets $ 114,922       $ 94,135       $ 114,922 $ 94,135 $ 110,155