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Segment Reporting
 12 Months Ended
Dec. 31, 2022
Segment Reporting [Abstract]  
Segment Reporting SEGMENT REPORTINGAs described in Note 1, our operations are assessed based on two reportable segments. The operations of our segments are managed separately, and each segment has unique technology, services and customer classes. We account for intersegment sales at prices that we generally establish by reference to similar transactions with unaffiliated customers. Reportable segments are measured based on operating income exclusive of general corporate expenses and gains (losses) on sales of corporate assets.
1. Information about Operations in our Different Industry Segments:
 Year Ended December 31,
 202220212020
 (In thousands)
REVENUES:
Government Operations$1,808,483 $1,725,097 $1,763,127 
Commercial Operations427,358 407,082 371,269 
Eliminations (1)
(3,007)(8,105)(10,880)
$2,232,834 $2,124,074 $2,123,516 
(1)Segment revenues are net of the following intersegment transfers:
Government Operations Transfers$(2,941)$(7,327)$(10,327)
Commercial Operations Transfers(66)(778)(553)
$(3,007)$(8,105)$(10,880)
OPERATING INCOME:
Government Operations$336,501 $329,549 $345,250 
Commercial Operations27,418 35,243 36,915 
$363,919 $364,792 $382,165 
Unallocated Corporate (1)
(15,348)(18,944)(23,613)
Total Operating Income (2)
$348,571 $345,848 $358,552 
Other Income (Expense)(34,194)49,865 3,620 
Income before Provision for Income Taxes$314,377 $395,713 $362,172 
(1)Unallocated Corporate includes general corporate overhead not allocated to segments.
(2)The following amounts are included in Operating Income:
Losses (Gains) on Asset Disposals and Impairments, Net:
Government Operations$(250)$(8)$320 
Commercial Operations6,233 (2,548)(1,681)
Unallocated Corporate(463)(976)— 
$5,520 $(3,532)$(1,361)
Equity in Income of Investees:
Government Operations$45,973 $33,498 $27,152 
Commercial Operations— — — 
$45,973 $33,498 $27,152 
 Year Ended December 31,
 202220212020
 (In thousands)
CAPITAL EXPENDITURES:
Government Operations$103,093 $147,051 $137,197 
Commercial Operations88,853 153,571 106,614 
Segment Capital Expenditures191,946 300,622 243,811 
Corporate Capital Expenditures6,366 10,430 11,216 
Total Capital Expenditures$198,312 $311,052 $255,027 
DEPRECIATION AND AMORTIZATION:
Government Operations$47,982 $42,485 $35,398 
Commercial Operations18,805 19,884 18,431 
Segment Depreciation and Amortization66,787 62,369 53,829 
Corporate Depreciation and Amortization7,055 6,711 6,845 
Total Depreciation and Amortization$73,842 $69,080 $60,674 
December 31,
202220212020
(In thousands)
SEGMENT ASSETS:
Government Operations$1,498,472 $1,430,863 $1,353,122 
Commercial Operations1,005,545 976,382 830,226 
Segment Assets2,504,017 2,407,245 2,183,348 
Corporate Assets114,922 94,135 110,155 
Total Assets$2,618,939 $2,501,380 $2,293,503 
INVESTMENT IN UNCONSOLIDATED AFFILIATES:
Government Operations$100,198 $85,284 $71,806 
Commercial Operations— — — 
Total Investment in Unconsolidated Affiliates$100,198 $85,284 $71,806 
2. Information about our Product and Service Lines:
 Year Ended December 31,
 202220212020
 (In thousands)
REVENUES:
Government Operations:
Nuclear Components and Fuel$1,494,810 $1,481,416 $1,512,980 
Downblending and Nuclear Services233,197 198,420 207,221 
Advanced Reactor Design and Engineering80,476 45,261 42,926 
1,808,483 1,725,097 1,763,127 
Commercial Operations:
Nuclear Manufacturing221,458 246,444 250,585 
Nuclear Services and Engineering205,900 160,638 120,684 
427,358 407,082 371,269 
Eliminations(3,007)(8,105)(10,880)
$2,232,834 $2,124,074 $2,123,516 
3. Information about our Consolidated Operations in Different Geographic Areas:
December 31,
202220212020
(In thousands)
NET PROPERTY, PLANT AND EQUIPMENT:
United States$743,767 $698,772 $603,518 
Canada389,490 346,868 212,953 
United Kingdom1,640 — — 
$1,134,897 $1,045,640 $816,471 
See Note 3 for revenues by geographic area for each of our segments.
4. Information about our Major Customers:
In the years ended December 31, 2022, 2021 and 2020, sales to the U.S. Government accounted for approximately 94%, 95% and 94% of our Government Operations segment revenues, respectively. In the years ended December 31, 2022, 2021 and 2020, sales to large utility customers accounted for approximately 74%, 75% and 73% of our Commercial Operations segment revenues, respectively.