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Segment Reporting - Schedule of Operating Results by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Segment Reporting, Other Significant Reconciling Item [Line Items]        
Revenues $ 519,878 $ 506,000 $ 1,566,606 $ 1,393,685
OPERATING INCOME:        
Total Operating Income 88,770 98,462 269,471 242,641
Other Income (Expense) 3,112 (3,956) 4,939 (7,524)
Income before Provision for Income Taxes 91,882 94,506 274,410 235,117
Nuclear Operations Group        
Segment Reporting, Other Significant Reconciling Item [Line Items]        
Revenues 386,502 394,484 1,220,529 1,057,637
Operating Segments        
Segment Reporting, Other Significant Reconciling Item [Line Items]        
Revenues 528,313 512,097 1,588,333 1,405,211
OPERATING INCOME:        
Total Operating Income 99,502 101,202 284,968 251,740
Operating Segments | Nuclear Operations Group        
Segment Reporting, Other Significant Reconciling Item [Line Items]        
Revenues 386,502 394,484 1,220,529 1,057,637
OPERATING INCOME:        
Total Operating Income 68,460 93,667 244,791 226,518
Operating Segments | Nuclear Power Group        
Segment Reporting, Other Significant Reconciling Item [Line Items]        
Revenues 108,104 84,376 264,004 255,414
OPERATING INCOME:        
Total Operating Income 29,199 8,967 38,771 36,433
Operating Segments | Nuclear Services Group        
Segment Reporting, Other Significant Reconciling Item [Line Items]        
Revenues 33,707 33,237 103,800 92,160
OPERATING INCOME:        
Total Operating Income 7,557 5,516 18,079 8,577
Eliminations        
Segment Reporting, Other Significant Reconciling Item [Line Items]        
Revenues (8,435) (6,097) (21,727) (11,526)
Eliminations | Nuclear Operations Group        
Segment Reporting, Other Significant Reconciling Item [Line Items]        
Revenues (970) (1,260) (2,506) (3,164)
Eliminations | Nuclear Power Group        
Segment Reporting, Other Significant Reconciling Item [Line Items]        
Revenues (56) (73) (330) (146)
Eliminations | Nuclear Services Group        
Segment Reporting, Other Significant Reconciling Item [Line Items]        
Revenues (7,409) (4,764) (18,891) (8,216)
Segment Reconciling Items        
OPERATING INCOME:        
Total Operating Income (5,714) (6,948) (16,673) (19,788)
Unallocated Corporate        
OPERATING INCOME:        
Total Operating Income $ (10,732) $ (2,740) $ (15,497) $ (9,099)