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Basis of Presentation and Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2023
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,
20232022
 (In thousands)
Cash and cash equivalents$75,766 $35,244 
Restricted cash and cash equivalents2,858 2,928 
Restricted cash and cash equivalents included in Other Assets2,991 2,818 
Total cash and cash equivalents and restricted cash and cash equivalents as presented on our consolidated statements of cash flows
$81,615 $40,990 
Property, Plant and Equipment
Property, plant and equipment is stated at cost and is set forth below:
 December 31,
 20232022
 (In thousands)
Land$10,627 $9,844 
Buildings381,081 365,955 
Machinery and equipment1,108,504 1,026,024 
Property under construction571,758 515,494 
2,071,970 1,917,317 
Less: Accumulated depreciation843,450 782,420 
Property, Plant and Equipment, Net$1,228,520 $1,134,897 
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, 2021$155,939 $129,563 $285,502 
Acquisition (Note 2)16,609 — 16,609 
Translation(461)(8,485)(8,946)
Balance at December 31, 2022$172,087 $121,078 $293,165 
Purchase price adjustment588 — 588 
Translation578 2,689 3,267 
Balance at December 31, 2023$173,253 $123,767 $297,020 
Schedule of Intangible Assets
Our Intangible Assets were as follows:
 December 31,
 202320222021
 (In thousands)
Amortized intangible assets:
Gross cost:
Technical support agreement$66,562 $65,069 $69,781 
Customer relationships57,103 56,176 40,247 
Unpatented technology40,540 39,609 38,073 
CNSC class 1B nuclear facility license25,670 25,094 26,911 
Acquired backlog13,882 13,537 7,595 
Patented technology755 738 792 
All other831 812 871 
Total$205,343 $201,035 $184,270 
Accumulated amortization:
Technical support agreement$(15,676)$(12,495)$(10,366)
Customer relationships(23,649)(20,590)(18,176)
Unpatented technology(10,345)(7,966)(6,398)
CNSC class 1B nuclear facility license(6,023)(5,052)(4,521)
Acquired backlog(7,116)(4,474)(2,531)
Patented technology(483)(405)(363)
All other(371)(271)(194)
Total$(63,663)$(51,253)$(42,549)
Net amortized intangible assets$141,680 $149,782 $141,721 
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,
 202320222021
 (In thousands)
Balance at beginning of period$193,612 $185,551 $192,751 
Acquisitions (Note 2)— 28,500 — 
Amortization expense(11,396)(10,901)(9,329)
Translation3,294 (9,538)2,129 
Balance at end of period$185,510 $193,612 $185,551 
Estimated Amortization Expense
Estimated amortization expense for the next five fiscal years is as follows (amounts in thousands):
Year Ended December 31,Amount
2024$11,579 
2025$11,579 
2026$10,371 
2027$8,750 
2028$7,986 
Maturities of Lease Liabilities The maturities of our lease liabilities at December 31, 2023 were as follows (amounts in thousands):
2024$4,131 
2025$3,796 
2026$2,858 
2027$1,989 
2028$1,747 
Thereafter$13,573 
Total lease payments$28,094 
Less: Interest$(7,860)
Present value of lease liabilities (1)
$20,234 
(1)Includes current lease liabilities of $4.0 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,
 202320222021
 (In thousands)
Balance at beginning of period$11,126 $10,696 $12,269 
Additions— 2,405 4,838 
Interest expense(2,048)(1,975)(6,411)
Balance at end of period$9,078 $11,126 $10,696 
Asset Retirement Obligations The following summarizes the changes in the carrying amount of these liabilities:
 Year Ended December 31,
 202320222021
 (In thousands)
Balance at beginning of period$82,512 $84,132 $78,110 
Costs incurred(3,471)(1,223)(215)
Additions/adjustments(6,512)(4,289)— 
Accretion6,939 5,158 5,996 
Translation73 (1,266)241 
Balance at end of period (1)
$79,541 $82,512 $84,132 
(1)Includes current asset retirement obligations of $2.3 million, $4.7 million and $4.7 million at December 31, 2023, 2022 and 2021, respectively.
Accumulated Other Comprehensive Income
The components of Accumulated other comprehensive income (loss) included in Stockholders' Equity are as follows:
 December 31,
 20232022
 (In thousands)
Currency translation adjustments$8,669 $(4,207)
Net unrealized gain on derivative financial instruments558 105 
Unrecognized prior service cost on benefit obligations(16,917)(17,955)
Net unrealized gain on available-for-sale investments227 127 
Accumulated other comprehensive income (loss)$(7,463)$(21,930)
Schedule of Amounts Reclassified from Accumulated Other Comprehensive Income
The amounts reclassified out of Accumulated other comprehensive income (loss) by component and the affected consolidated statements of income line items are as follows:
 Year Ended December 31, 
 202320222021 
Accumulated Other Comprehensive Income (Loss) Component Recognized
(In thousands)Line Item Presented
Realized (loss) gain on derivative financial instruments$(72)$(370)$307 
Revenues
427 (343)(712)
Cost of operations
355 (713)(405)
Total before tax
(91)181 103 
Provision for Income Taxes
$264 $(532)$(302)
Net Income
Amortization of prior service cost on benefit obligations
$(3,278)$(3,283)$(2,919)
Other – net
609 657 624 
Provision for Income Taxes
$(2,669)$(2,626)$(2,295)
Net Income
Total reclassification for the period
$(2,405)$(3,158)$(2,597)