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Basis of Presentation and Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2022
Accounting Policies [Abstract]  
Restrictions on Cash and Cash Equivalents
The following table provides a reconciliation of cash and cash equivalents and restricted cash and cash equivalents on our consolidated balance sheets to the totals presented on our consolidated statements of cash flows:
December 31,
20222021
 (In thousands)
Cash and cash equivalents$35,244 $33,891 
Restricted cash and cash equivalents2,928 2,896 
Restricted cash and cash equivalents included in Other Assets2,818 2,988 
Total cash and cash equivalents and restricted cash and cash equivalents as presented on our consolidated statements of cash flows
$40,990 $39,775 
Property, Plant and Equipment
Property, plant and equipment is stated at cost and is set forth below:
 December 31,
 20222021
 (In thousands)
Land$9,844 $9,538 
Buildings365,955 321,872 
Machinery and equipment1,026,024 957,423 
Property under construction515,494 487,856 
1,917,317 1,776,689 
Less: Accumulated depreciation782,420 731,049 
Property, Plant and Equipment, Net$1,134,897 $1,045,640 
Changes in Carrying Amount of Goodwill
The following summarizes the changes in the carrying amount of Goodwill:
Government OperationsCommercial OperationsTotal
 (In thousands)
Balance at December 31, 2020$155,939 $127,769 $283,708 
Translation— 1,794 1,794 
Balance at December 31, 2021$155,939 $129,563 $285,502 
Acquisitions (Note 2)16,609 — 16,609 
Translation(461)(8,485)(8,946)
Balance at December 31, 2022$172,087 $121,078 $293,165 
Schedule of Intangible Assets
Our Intangible Assets were as follows:
 December 31,
 202220212020
 (In thousands)
Amortized intangible assets:
Gross cost:
Technical support agreement$65,069 $69,781 $68,785 
Customer relationships56,176 40,247 39,954 
Unpatented technology39,609 38,073 37,529 
CNSC class 1B nuclear facility license25,094 26,911 26,528 
Acquired backlog13,537 7,595 7,487 
Patented technology738 792 780 
All other812 871 858 
Total$201,035 $184,270 $181,921 
Accumulated amortization:
Technical support agreement$(12,495)$(10,366)$(7,227)
Customer relationships(20,590)(18,176)(15,996)
Unpatented technology(7,966)(6,398)(4,584)
CNSC class 1B nuclear facility license(5,052)(4,521)(3,573)
Acquired backlog(4,474)(2,531)(1,248)
Patented technology(405)(363)(286)
All other(271)(194)(86)
Total$(51,253)$(42,549)$(33,000)
Net amortized intangible assets$149,782 $141,721 $148,921 
Unamortized intangible assets:
NRC category 1 license$43,830 $43,830 $43,830 
Changes in Carrying Amount of Intangible Assets
The following summarizes the changes in the carrying amount of Intangible Assets:
 Year Ended December 31,
 202220212020
 (In thousands)
Balance at beginning of period$185,551 $192,751 $191,392 
Acquisitions (Note 2)28,500 — 8,180 
Amortization expense(10,901)(9,329)(8,824)
Translation and other (1)
(9,538)2,129 2,003 
Balance at end of period$193,612 $185,551 $192,751 
(1)Includes $(0.6) million related to the divestiture of the U.S.-based commercial nuclear services business during the year ended December 31, 2020.
Estimated Amortization Expense
Estimated amortization expense for the next five fiscal years is as follows (amounts in thousands):
Year Ended December 31,Amount
2023$11,328 
2024$11,328 
2025$11,328 
2026$10,147 
2027$8,552 
Maturities of Lease Liabilities The maturities of our lease liabilities at December 31, 2022 were as follows (amounts in thousands):
2023$4,546 
20243,647 
20253,026 
20262,426 
20271,609 
Thereafter15,824 
Total lease payments$31,078 
Less: Interest(8,673)
Present value of lease liabilities (1)
$22,405 
(1)Includes current lease liabilities of $4.4 million.
Changes in Carrying Amount of Debt Issuance Costs The following summarizes the changes in the carrying amount of these assets:
 Year Ended December 31,
 202220212020
 (In thousands)
Balance at beginning of period$10,696 $12,269 $8,006 
Additions2,405 4,838 6,803 
Interest expense (1)
(1,975)(6,411)(2,540)
Balance at end of period$11,126 $10,696 $12,269 
(1)Includes the recognition of prior deferred debt issuance costs associated with former debt instruments of $(4.2) million and $(0.7) million for the years ended December 31, 2021 and 2020, respectively.
Asset Retirement Obligations The following summarizes the changes in the carrying amount of these liabilities:
 Year Ended December 31,
 202220212020
 (In thousands)
Balance at beginning of period$84,132 $78,110 $77,288 
Costs incurred(1,223)(215)(1,608)
Additions/adjustments(4,289)— (3,284)
Accretion5,158 5,996 5,343 
Translation(1,266)241 371 
Balance at end of period (1)
$82,512 $84,132 $78,110 
(1)Includes current asset retirement obligations of $4.7 million, $4.7 million and $2.8 million at December 31, 2022, 2021 and 2020, respectively.
Accumulated Other Comprehensive Income
The components of Accumulated other comprehensive income included in Stockholders' Equity are as follows:
 December 31,
 20222021
 (In thousands)
Currency translation adjustments$(4,207)$30,627 
Net unrealized gain (loss) on derivative financial instruments105 (694)
Unrecognized prior service cost on benefit obligations(17,955)(18,022)
Net unrealized gain on available-for-sale investments127 232 
Accumulated other comprehensive income$(21,930)$12,143 
Schedule of Amounts Reclassified from Accumulated Other Comprehensive Income
The amounts reclassified out of Accumulated other comprehensive income by component and the affected consolidated statements of income line items are as follows:
 Year Ended December 31, 
 202220212020 
Accumulated Other Comprehensive Income (Loss) Component Recognized
(In thousands)Line Item Presented
Realized (loss) gain on derivative financial instruments$(370)$307 $(35)
Revenues
(343)(712)695 
Cost of operations
(713)(405)660 
Total before tax
181 103 (173)
Provision for Income Taxes
$(532)$(302)$487 
Net Income
Amortization of prior service cost on benefit obligations
$(3,283)$(2,919)$(3,177)
Other – net
657 624 645 
Provision for Income Taxes
$(2,626)$(2,295)$(2,532)
Net Income
Total reclassification for the period
$(3,158)$(2,597)$(2,045)