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Segment Reporting
 12 Months Ended
Dec. 31, 2020
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,
 202020192018
 (In thousands)
REVENUES:
Nuclear Operations Group$1,646,257 $1,428,587 $1,319,170 
Nuclear Power Group371,269 352,640 365,911 
Nuclear Services Group136,493 131,339 122,438 
Eliminations (1)
(30,503)(17,646)(7,630)
$2,123,516 $1,894,920 $1,799,889 
(1)Segment revenues are net of the following intersegment transfers:
Nuclear Operations Group Transfers$(3,791)$(4,382)$(4,004)
Nuclear Power Group Transfers(553)(208)(308)
Nuclear Services Group Transfers(26,159)(13,056)(3,318)
$(30,503)$(17,646)$(7,630)
OPERATING INCOME:
Nuclear Operations Group$326,049 $298,328 $271,405 
Nuclear Power Group51,989 53,815 52,270 
Nuclear Services Group26,436 14,226 20,374 
Other(22,309)(23,099)(18,074)
$382,165 $343,270 $325,975 
Unallocated Corporate (1)
(23,613)(17,749)(20,998)
Total Operating Income (2)
$358,552 $325,521 $304,977 
Other Income (Expense)3,620 (11,779)(24,832)
Income before Provision for Income Taxes$362,172 $313,742 $280,145 
(1)Unallocated Corporate includes general corporate overhead not allocated to segments.
(2)The following amounts are included in Operating Income:
Losses (Gains) on Asset Disposals and Impairments, Net:
Nuclear Operations Group$(8)$(6)$— 
Nuclear Power Group(1,681)103 (179)
Nuclear Services Group328 2,727 — 
Other— — 467 
Unallocated Corporate— — (224)
$(1,361)$2,824 $64 
Equity in Income of Investees:
Nuclear Operations Group$— $— $— 
Nuclear Power Group— — — 
Nuclear Services Group27,152 28,924 30,343 
Other— — — 
$27,152 $28,924 $30,343 
 Year Ended December 31,
 202020192018
 (In thousands)
CAPITAL EXPENDITURES:
Nuclear Operations Group$135,637 $133,279 $93,360 
Nuclear Power Group106,596 38,053 4,710 
Nuclear Services Group1,326 1,169 974 
Other252 2,597 2,780 
Segment Capital Expenditures243,811 175,098 101,824 
Corporate Capital Expenditures11,216 7,026 7,514 
Total Capital Expenditures$255,027 $182,124 $109,338 
DEPRECIATION AND AMORTIZATION:
Nuclear Operations Group$33,174 $33,231 $32,132 
Nuclear Power Group18,325 17,054 17,154 
Nuclear Services Group1,685 3,246 3,401 
Other645 787 — 
Segment Depreciation and Amortization53,829 54,318 52,687 
Corporate Depreciation and Amortization6,845 7,404 7,410 
Total Depreciation and Amortization$60,674 $61,722 $60,097 
December 31,
202020192018
(In thousands)
SEGMENT ASSETS:
Nuclear Operations Group$1,184,741 $986,827 $878,758 
Nuclear Power Group828,729 580,413 482,763 
Nuclear Services Group166,240 177,952 180,441 
Other3,638 3,751 5,557 
Segment Assets2,183,348 1,748,943 1,547,519 
Corporate Assets110,155 159,970 107,577 
Total Assets$2,293,503 $1,908,913 $1,655,096 
INVESTMENT IN UNCONSOLIDATED AFFILIATES:
Nuclear Operations Group$— $— $— 
Nuclear Power Group— — — 
Nuclear Services Group71,806 70,116 63,746 
Other— — — 
Total Investment in Unconsolidated Affiliates$71,806 $70,116 $63,746 
2. Information about our Product and Service Lines:
 Year Ended December 31,
 202020192018
 (In thousands)
REVENUES:
Nuclear Operations Group:
Government Programs$1,540,256 $1,368,555 $1,311,886 
Commercial Operations106,001 60,032 7,284 
1,646,257 1,428,587 1,319,170 
Nuclear Power Group:
Nuclear Manufacturing250,585 243,472 201,628 
Nuclear Services and Engineering120,684 109,168 164,283 
371,269 352,640 365,911 
Nuclear Services Group:
Nuclear Environmental Services94,320 102,726 96,566 
Nuclear Services and Advanced Reactor Design and Engineering42,173 28,613 25,872 
136,493 131,339 122,438 
Eliminations(30,503)(17,646)(7,630)
$2,123,516 $1,894,920 $1,799,889 
3. Information about our Consolidated Operations in Different Geographic Areas:
 Year Ended December 31,
 202020192018
 (In thousands)
REVENUES (1):
U.S.$1,780,409 $1,572,085 $1,446,791 
Canada309,688 287,971 294,913 
All Other Countries33,419 34,864 58,185 
$2,123,516 $1,894,920 $1,799,889 
(1)We allocate geographic revenues based on the location of the customers' operations.
December 31,
202020192018
(In thousands)
NET PROPERTY, PLANT AND EQUIPMENT:
U.S.$603,518 $494,202 $390,632 
Canada212,953 86,039 48,607 
$816,471 $580,241 $439,239 
4. Information about our Major Customers:
In the years ended December 31, 2020, 2019 and 2018, sales to the U.S. Government accounted for approximately 77%, 77% and 79% of our total consolidated revenues, respectively, all of which were included in our Nuclear Operations Group and Nuclear Services Group segments.