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v3.20.4

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)

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