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Segment Reporting - Schedule of Operating Results by Segment (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
segment
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Segment Reporting, Other Significant Reconciling Item [Line Items]                      
Number of reportable segments | segment                 3    
Revenues $ 556,910 $ 519,878 $ 504,520 $ 542,208 $ 501,235 $ 506,000 $ 471,231 $ 416,454 $ 2,123,516 $ 1,894,920 $ 1,799,889
Operating income 89,081 88,770 82,434 98,267 82,880 98,462 80,535 63,644 358,552 325,521 304,977
Other Income (Expense)                 3,620 (11,779) (24,832)
Total before tax                 362,172 313,742 280,145
Losses (Gains) on Asset Disposals and Impairments, Net:                 (1,361) 2,824 64
Equity in Income of Investees 7,905 $ 8,271 $ 4,913 $ 6,063 6,506 $ 7,874 $ 6,862 $ 7,682 27,152 28,924 30,343
Total Capital Expenditures                 255,027 182,124 109,338
Total Depreciation and Amortization                 60,674 61,722 60,097
Total Assets 2,293,503       1,908,913       2,293,503 1,908,913 1,655,096
Total Investment in Unconsolidated Affiliates 71,806       70,116       71,806 70,116 63,746
Nuclear Power Group                      
Segment Reporting, Other Significant Reconciling Item [Line Items]                      
Revenues                 371,269 352,640 365,911
Nuclear Services Group                      
Segment Reporting, Other Significant Reconciling Item [Line Items]                      
Revenues                 136,493 131,339 122,438
Nuclear Operations Group                      
Segment Reporting, Other Significant Reconciling Item [Line Items]                      
Revenues                 1,646,257 1,428,587 1,319,170
Reportable Segments                      
Segment Reporting, Other Significant Reconciling Item [Line Items]                      
Revenues                 2,154,019 1,912,566 1,807,519
Operating income                 382,165 343,270 325,975
Total Capital Expenditures                 243,811 175,098 101,824
Total Depreciation and Amortization                 53,829 54,318 52,687
Total Assets 2,183,348       1,748,943       2,183,348 1,748,943 1,547,519
Reportable Segments | Nuclear Power Group                      
Segment Reporting, Other Significant Reconciling Item [Line Items]                      
Revenues                 371,269 352,640 365,911
Operating income                 51,989 53,815 52,270
Losses (Gains) on Asset Disposals and Impairments, Net:                 (1,681) 103 (179)
Equity in Income of Investees                 0 0 0
Total Capital Expenditures                 106,596 38,053 4,710
Total Depreciation and Amortization                 18,325 17,054 17,154
Total Assets 828,729       580,413       828,729 580,413 482,763
Total Investment in Unconsolidated Affiliates 0       0       0 0 0
Reportable Segments | Nuclear Services Group                      
Segment Reporting, Other Significant Reconciling Item [Line Items]                      
Revenues                 136,493 131,339 122,438
Operating income                 26,436 14,226 20,374
Losses (Gains) on Asset Disposals and Impairments, Net:                 328 2,727 0
Equity in Income of Investees                 27,152 28,924 30,343
Total Capital Expenditures                 1,326 1,169 974
Total Depreciation and Amortization                 1,685 3,246 3,401
Total Assets 166,240       177,952       166,240 177,952 180,441
Total Investment in Unconsolidated Affiliates 71,806       70,116       71,806 70,116 63,746
Reportable Segments | Nuclear Operations Group                      
Segment Reporting, Other Significant Reconciling Item [Line Items]                      
Revenues                 1,646,257 1,428,587 1,319,170
Operating income                 326,049 298,328 271,405
Losses (Gains) on Asset Disposals and Impairments, Net:                 (8) (6) 0
Equity in Income of Investees                 0 0 0
Total Capital Expenditures                 135,637 133,279 93,360
Total Depreciation and Amortization                 33,174 33,231 32,132
Total Assets 1,184,741       986,827       1,184,741 986,827 878,758
Total Investment in Unconsolidated Affiliates 0       0       0 0 0
Eliminations                      
Segment Reporting, Other Significant Reconciling Item [Line Items]                      
Revenues                 (30,503) (17,646) (7,630)
Operating income                 (23,613) (17,749) (20,998)
Losses (Gains) on Asset Disposals and Impairments, Net:                 0 0 (224)
Total Capital Expenditures                 252 2,597 2,780
Total Depreciation and Amortization                 645 787 0
Total Assets 3,638       3,751       3,638 3,751 5,557
Eliminations | Nuclear Power Group                      
Segment Reporting, Other Significant Reconciling Item [Line Items]                      
Revenues                 (553) (208) (308)
Eliminations | Nuclear Services Group                      
Segment Reporting, Other Significant Reconciling Item [Line Items]                      
Revenues                 (26,159) (13,056) (3,318)
Eliminations | Nuclear Operations Group                      
Segment Reporting, Other Significant Reconciling Item [Line Items]                      
Revenues                 (3,791) (4,382) (4,004)
Other                      
Segment Reporting, Other Significant Reconciling Item [Line Items]                      
Operating income                 (22,309) (23,099) (18,074)
Losses (Gains) on Asset Disposals and Impairments, Net:                 0 0 467
Equity in Income of Investees                 0 0 0
Total Capital Expenditures                 11,216 7,026 7,514
Total Depreciation and Amortization                 6,845 7,404 7,410
Total Assets 110,155       159,970       110,155 159,970 107,577
Total Investment in Unconsolidated Affiliates $ 0       $ 0       $ 0 $ 0 $ 0