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Segment Reporting - Schedule of Operating Results by Segment (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2021
USD ($)
Sep. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2021
USD ($)
segment
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Segment Reporting, Other Significant Reconciling Item [Line Items]                      
Number of reportable segments | segment                 3    
Revenues $ 591,975 $ 498,727 $ 505,099 $ 528,273 $ 556,910 $ 519,878 $ 504,520 $ 542,208 $ 2,124,074 $ 2,123,516 $ 1,894,920
Operating income 102,215 87,468 73,751 82,414 89,081 88,770 82,434 98,267 345,848 358,552 325,521
Other Income (Expense)                 49,865 3,620 (11,779)
Total before tax                 395,713 362,172 313,742
Losses (Gains) on Asset Disposals and Impairments, Net:                 (3,532) (1,361) 2,824
Equity in Income of Investees 7,301 $ 10,618 $ 7,263 $ 8,316 7,905 $ 8,271 $ 4,913 $ 6,063 33,498 27,152 28,924
Total Capital Expenditures                 311,052 255,027 182,124
Total Depreciation and Amortization                 69,080 60,674 61,722
Total Assets 2,501,380       2,293,503       2,501,380 2,293,503 1,908,913
Total Investment in Unconsolidated Affiliates 85,284       71,806       85,284 71,806 70,116
Nuclear Power Group                      
Segment Reporting, Other Significant Reconciling Item [Line Items]                      
Revenues                 407,082 371,269 352,640
Nuclear Services Group                      
Segment Reporting, Other Significant Reconciling Item [Line Items]                      
Revenues                 123,538 136,493 131,339
Nuclear Operations Group                      
Segment Reporting, Other Significant Reconciling Item [Line Items]                      
Revenues                 1,622,598 1,646,257 1,428,587
Reportable Segments                      
Segment Reporting, Other Significant Reconciling Item [Line Items]                      
Revenues                 2,153,218 2,154,019 1,912,566
Operating income                 364,792 382,165 343,270
Total Capital Expenditures                 300,622 243,811 175,098
Total Depreciation and Amortization                 62,369 53,829 54,318
Total Assets 2,407,245       2,183,348       2,407,245 2,183,348 1,748,943
Reportable Segments | Nuclear Power Group                      
Segment Reporting, Other Significant Reconciling Item [Line Items]                      
Revenues                 407,082 371,269 352,640
Operating income                 52,548 51,989 53,815
Losses (Gains) on Asset Disposals and Impairments, Net:                 (2,548) (1,681) 103
Equity in Income of Investees                 0 0 0
Total Capital Expenditures                 153,571 106,596 38,053
Total Depreciation and Amortization                 19,774 18,325 17,054
Total Assets 974,372       828,729       974,372 828,729 580,413
Total Investment in Unconsolidated Affiliates 0       0       0 0 0
Reportable Segments | Nuclear Services Group                      
Segment Reporting, Other Significant Reconciling Item [Line Items]                      
Revenues                 123,538 136,493 131,339
Operating income                 27,932 26,436 14,226
Losses (Gains) on Asset Disposals and Impairments, Net:                 0 328 2,727
Equity in Income of Investees                 33,498 27,152 28,924
Total Capital Expenditures                 2,940 1,326 1,169
Total Depreciation and Amortization                 1,005 1,685 3,246
Total Assets 186,249       166,240       186,249 166,240 177,952
Total Investment in Unconsolidated Affiliates 85,284       71,806       85,284 71,806 70,116
Reportable Segments | Nuclear Operations Group                      
Segment Reporting, Other Significant Reconciling Item [Line Items]                      
Revenues                 1,622,598 1,646,257 1,428,587
Operating income                 308,645 326,049 298,328
Losses (Gains) on Asset Disposals and Impairments, Net:                 (8) (8) (6)
Equity in Income of Investees                 0 0 0
Total Capital Expenditures                 143,945 135,637 133,279
Total Depreciation and Amortization                 40,514 33,174 33,231
Total Assets 1,243,766       1,184,741       1,243,766 1,184,741 986,827
Total Investment in Unconsolidated Affiliates 0       0       0 0 0
Eliminations                      
Segment Reporting, Other Significant Reconciling Item [Line Items]                      
Revenues                 (29,144) (30,503) (17,646)
Operating income                 (18,944) (23,613) (17,749)
Losses (Gains) on Asset Disposals and Impairments, Net:                 (976) 0 0
Total Capital Expenditures                 166 252 2,597
Total Depreciation and Amortization                 1,076 645 787
Total Assets 2,858       3,638       2,858 3,638 3,751
Eliminations | Nuclear Power Group                      
Segment Reporting, Other Significant Reconciling Item [Line Items]                      
Revenues                 (778) (553) (208)
Eliminations | Nuclear Services Group                      
Segment Reporting, Other Significant Reconciling Item [Line Items]                      
Revenues                 (22,964) (26,159) (13,056)
Eliminations | Nuclear Operations Group                      
Segment Reporting, Other Significant Reconciling Item [Line Items]                      
Revenues                 (5,402) (3,791) (4,382)
Other                      
Segment Reporting, Other Significant Reconciling Item [Line Items]                      
Operating income                 (24,333) (22,309) (23,099)
Losses (Gains) on Asset Disposals and Impairments, Net:                 0 0 0
Equity in Income of Investees                 0 0 0
Total Capital Expenditures                 10,430 11,216 7,026
Total Depreciation and Amortization                 6,711 6,845 7,404
Total Assets 94,135       110,155       94,135 110,155 159,970
Total Investment in Unconsolidated Affiliates $ 0       $ 0       $ 0 $ 0 $ 0