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Segment Information (Narrative) (Details)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Ten Largest Customers | Revenue Benchmark | Customer Concentration Risk
Revenue	75.00%	57.00%	71.00%
Synatom | Revenue Benchmark | Customer Concentration Risk
Revenue	13.00%	12.00%	14.00%
Kyushu Electric Power | Revenue Benchmark | Customer Concentration Risk
Revenue	15.00%	12.00%
Energy Harbor Nuclear Corporation | Revenue Benchmark | Customer Concentration Risk
Revenue			13.00%
Dominion Energy South Carolina | Revenue Benchmark | Customer Concentration Risk
Revenue			10.00%
Technical Solutions Segment [Member]
Revenue from first customer over 10 percent	20.00%	38.00%	21.00%

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- Definition

Revenue from first customer over 10 percent

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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