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Segment Reporting
 12 Months Ended
Dec. 31, 2021
Segment Reporting [Abstract]  
Segment Reporting SEGMENT REPORTINGAs described in Note 1, our operations are assessed based on three 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,
 202120202019
 (In thousands)
REVENUES:
Nuclear Operations Group$1,622,598 $1,646,257 $1,428,587 
Nuclear Power Group407,082 371,269 352,640 
Nuclear Services Group123,538 136,493 131,339 
Eliminations (1)
(29,144)(30,503)(17,646)
$2,124,074 $2,123,516 $1,894,920 
(1)Segment revenues are net of the following intersegment transfers:
Nuclear Operations Group Transfers$(5,402)$(3,791)$(4,382)
Nuclear Power Group Transfers(778)(553)(208)
Nuclear Services Group Transfers(22,964)(26,159)(13,056)
$(29,144)$(30,503)$(17,646)
OPERATING INCOME:
Nuclear Operations Group$308,645 $326,049 $298,328 
Nuclear Power Group52,548 51,989 53,815 
Nuclear Services Group27,932 26,436 14,226 
Other(24,333)(22,309)(23,099)
$364,792 $382,165 $343,270 
Unallocated Corporate (1)
(18,944)(23,613)(17,749)
Total Operating Income (2)
$345,848 $358,552 $325,521 
Other Income (Expense)49,865 3,620 (11,779)
Income before Provision for Income Taxes$395,713 $362,172 $313,742 
(1)Unallocated Corporate includes general corporate overhead not allocated to segments.
(2)The following amounts are included in Operating Income:
Losses (Gains) on Asset Disposals and Impairments, Net:
Nuclear Operations Group$(8)$(8)$(6)
Nuclear Power Group(2,548)(1,681)103 
Nuclear Services Group— 328 2,727 
Other— — — 
Unallocated Corporate(976)— — 
$(3,532)$(1,361)$2,824 
Equity in Income of Investees:
Nuclear Operations Group$— $— $— 
Nuclear Power Group— — — 
Nuclear Services Group33,498 27,152 28,924 
Other— — — 
$33,498 $27,152 $28,924 
 Year Ended December 31,
 202120202019
 (In thousands)
CAPITAL EXPENDITURES:
Nuclear Operations Group$143,945 $135,637 $133,279 
Nuclear Power Group153,571 106,596 38,053 
Nuclear Services Group2,940 1,326 1,169 
Other166 252 2,597 
Segment Capital Expenditures300,622 243,811 175,098 
Corporate Capital Expenditures10,430 11,216 7,026 
Total Capital Expenditures$311,052 $255,027 $182,124 
DEPRECIATION AND AMORTIZATION:
Nuclear Operations Group$40,514 $33,174 $33,231 
Nuclear Power Group19,774 18,325 17,054 
Nuclear Services Group1,005 1,685 3,246 
Other1,076 645 787 
Segment Depreciation and Amortization62,369 53,829 54,318 
Corporate Depreciation and Amortization6,711 6,845 7,404 
Total Depreciation and Amortization$69,080 $60,674 $61,722 
December 31,
202120202019
(In thousands)
SEGMENT ASSETS:
Nuclear Operations Group$1,243,766 $1,184,741 $986,827 
Nuclear Power Group974,372 828,729 580,413 
Nuclear Services Group186,249 166,240 177,952 
Other2,858 3,638 3,751 
Segment Assets2,407,245 2,183,348 1,748,943 
Corporate Assets94,135 110,155 159,970 
Total Assets$2,501,380 $2,293,503 $1,908,913 
INVESTMENT IN UNCONSOLIDATED AFFILIATES:
Nuclear Operations Group$— $— $— 
Nuclear Power Group— — — 
Nuclear Services Group85,284 71,806 70,116 
Other— — — 
Total Investment in Unconsolidated Affiliates$85,284 $71,806 $70,116 
2. Information about our Product and Service Lines:
 Year Ended December 31,
 202120202019
 (In thousands)
REVENUES:
Nuclear Operations Group:
Government Programs$1,527,704 $1,540,256 $1,368,555 
Commercial Operations94,894 106,001 60,032 
1,622,598 1,646,257 1,428,587 
Nuclear Power Group:
Nuclear Manufacturing246,444 250,585 243,472 
Nuclear Services and Engineering160,638 120,684 109,168 
407,082 371,269 352,640 
Nuclear Services Group:
Nuclear Environmental Services77,514 94,320 102,726 
Nuclear Services and Advanced Reactor Design and Engineering46,024 42,173 28,613 
123,538 136,493 131,339 
Eliminations(29,144)(30,503)(17,646)
$2,124,074 $2,123,516 $1,894,920 
3. Information about our Consolidated Operations in Different Geographic Areas:
December 31,
202120202019
(In thousands)
NET PROPERTY, PLANT AND EQUIPMENT:
U.S.$698,772 $603,518 $494,202 
Canada346,868 212,953 86,039 
$1,045,640 $816,471 $580,241 
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, 2021, 2020 and 2019, sales to the U.S. Government accounted for approximately 76%, 77% and 77% of our total consolidated revenues, respectively, all of which were included in our Nuclear Operations Group and Nuclear Services Group segments.