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Segment Reporting - Schedule of Operating Results by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting, Other Significant Reconciling Item [Line Items]
Revenues	$ 438,921	$ 410,011	$ 896,384	$ 838,240
Operating Income	71,549	85,428	151,437	161,700
Interest income	441	211	1,219	348
Interest expense	(7,869)	(3,906)	(11,429)	(7,423)
Other – net	15,106	6,749	23,016	14,235
Total Other Income (Expense)	7,678	3,054	12,806	7,160
Income before Provision for Income Taxes	79,227	88,482	164,243	168,860
Operating Segments
Segment Reporting, Other Significant Reconciling Item [Line Items]
Operating Income	74,010	89,336	160,565	168,831
Operating Segments | Nuclear Operations Group
Segment Reporting, Other Significant Reconciling Item [Line Items]
Revenues	332,140	312,866	648,771	637,947
Operating Income	67,046	69,295	134,703	137,044
Operating Segments | Nuclear Services Group
Segment Reporting, Other Significant Reconciling Item [Line Items]
Revenues	32,596	44,785	62,629	72,639
Operating Income	3,511	15,399	4,688	15,801
Operating Segments | Nuclear Power Group
Segment Reporting, Other Significant Reconciling Item [Line Items]
Revenues	75,697	54,569	188,513	132,243
Operating Income	7,810	5,712	29,574	18,668
Operating Segments | Other
Segment Reporting, Other Significant Reconciling Item [Line Items]
Operating Income	(4,357)	(1,070)	(8,400)	(2,682)
Adjustments and Eliminations
Segment Reporting, Other Significant Reconciling Item [Line Items]
Revenues	(1,512)	(2,209)	(3,529)	(4,589)
Adjustments and Eliminations | Nuclear Operations Group
Segment Reporting, Other Significant Reconciling Item [Line Items]
Revenues	(841)	(205)	(1,980)	(400)
Adjustments and Eliminations | Nuclear Services Group
Segment Reporting, Other Significant Reconciling Item [Line Items]
Revenues	(702)	(1,913)	(1,540)	(4,070)
Adjustments and Eliminations | Nuclear Power Group
Segment Reporting, Other Significant Reconciling Item [Line Items]
Revenues	31	(91)	(9)	(119)
Unallocated Corporate
Segment Reporting, Other Significant Reconciling Item [Line Items]
Operating Income	$ (2,461)	$ (3,908)	$ (9,128)	$ (7,131)

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