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Segment Reporting - Schedule of Segment Reporting Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]                      
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
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
Nuclear Power Group                      
Segment Reporting Information [Line Items]                      
Revenues                 371,269 352,640 365,911
Nuclear Services Group                      
Segment Reporting Information [Line Items]                      
Revenues                 136,493 131,339 122,438
Nuclear Operations Group                      
Segment Reporting Information [Line Items]                      
Revenues                 1,646,257 1,428,587 1,319,170
Reportable Segments                      
Segment Reporting Information [Line Items]                      
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
Revenues                 2,154,019 1,912,566 1,807,519
Reportable Segments | Nuclear Power Group                      
Segment Reporting Information [Line Items]                      
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
Revenues                 371,269 352,640 365,911
Reportable Segments | Nuclear Services Group                      
Segment Reporting Information [Line Items]                      
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
Revenues                 136,493 131,339 122,438
Reportable Segments | Nuclear Operations Group                      
Segment Reporting Information [Line Items]                      
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
Revenues                 1,646,257 1,428,587 1,319,170
Other                      
Segment Reporting Information [Line Items]                      
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
Consolidation, Eliminations                      
Segment Reporting Information [Line Items]                      
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
Revenues                 (30,503) (17,646) (7,630)
Consolidation, Eliminations | Nuclear Power Group                      
Segment Reporting Information [Line Items]                      
Revenues                 (553) (208) (308)
Consolidation, Eliminations | Nuclear Services Group                      
Segment Reporting Information [Line Items]                      
Revenues                 (26,159) (13,056) (3,318)
Consolidation, Eliminations | Nuclear Operations Group                      
Segment Reporting Information [Line Items]                      
Revenues                 $ (3,791) $ (4,382) $ (4,004)