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Basis of Presentation and Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2020
Accounting Policies [Abstract]  
Summary of Changes in Carrying Amount of Accrued Warranty Expense
The following summarizes the changes in the carrying amount of Accrued warranty expense:
 Year Ended December 31,
 202020192018
 (In thousands)
Balance at beginning of period$9,042 $10,344 $13,428 
Additions1,341 2,232 1,494 
Expirations and other changes (1)
(1,624)(2,728)(3,367)
Payments(1,026)(1,065)(663)
Translation and other (2)
(2,441)259 (548)
Balance at end of period$5,292 $9,042 $10,344 
(1)Includes discounts provided to customers in satisfaction of warranty obligations totaling $(1.2) million in each of the years ended December 31, 2019 and 2018.
(2)Includes $(2.5) million related to the divestiture of the U.S.-based commercial nuclear services business during the year ended December 31, 2020.
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,
20202019
 (In thousands)
Cash and cash equivalents$42,610 $86,540 
Restricted cash and cash equivalents3,070 3,056 
Restricted cash and cash equivalents included in Other Assets2,618 2,804 
Total cash and cash equivalents and restricted cash and cash equivalents as presented on our consolidated statements of cash flows
$48,298 $92,400 
Property, Plant and Equipment
Property, plant and equipment is stated at cost and is set forth below:
 December 31,
 20202019
 (In thousands)
Land$9,585 $8,919 
Buildings267,808 221,462 
Machinery and equipment827,785 775,997 
Property under construction420,374 265,715 
1,525,552 1,272,093 
Less: Accumulated depreciation709,081 691,852 
Property, Plant and Equipment, Net$816,471 $580,241 
Changes in Carrying Amount of Goodwill
The following summarizes the changes in the carrying amount of Goodwill:
Nuclear
Operations Group		Nuclear
Power
Group		Nuclear
Services
Group		Total
 (In thousands)
Balance at December 31, 2018$110,939 $118,143 $45,000 $274,082 
Translation and other (1)
— 1,420 — 1,420 
Balance at December 31, 2019$110,939 $119,563 $45,000 $275,502 
Acquisition of Laker Energy Products (Note 2)— 5,753 — 5,753 
Translation— 2,453 — 2,453 
Balance at December 31, 2020$110,939 $127,769 $45,000 $283,708 
(1)Includes an adjustment of $(3.2) million, net of tax, to correct the business combination accounting for our 2016 acquisition.
Schedule of Intangible Assets
Our Intangible Assets were as follows:
 December 31,
 202020192018
 (In thousands)
Amortized intangible assets:
Gross cost:
Technical support agreement$68,785 $67,423 $64,749 
Customer relationships39,954 39,555 38,771 
Unpatented technology37,529 36,785 35,327 
Favorable operating leases— — 35,161 
CNSC class 1B nuclear facility license26,528 26,002 24,971 
Acquired backlog7,487 — 8,079 
Patented technology780 765 734 
All other858 2,200 2,200 
Total$181,921 $172,730 $209,992 
Accumulated amortization:
Technical support agreement$(7,227)$(4,153)$(1,173)
Customer relationships(15,996)(13,841)(11,767)
Unpatented technology(4,584)(2,805)(1,194)
Favorable operating leases— — (1,295)
CNSC class 1B nuclear facility license(3,573)(2,635)(1,698)
Acquired backlog(1,248)— (6,581)
Patented technology(286)(212)(136)
All other(86)(1,522)(1,302)
Total$(33,000)$(25,168)$(25,146)
Net amortized intangible assets$148,921 $147,562 $184,846 
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,
 202020192018
 (In thousands)
Balance at beginning of period$191,392 $228,676 $110,405 
Acquisitions (Note 2)8,180 — 139,257 
Amortization expense(8,824)(9,128)(11,490)
Reclassification of right-of-use assets— (33,866)— 
Translation and other (1)
2,003 5,710 (9,496)
Balance at end of period$192,751 $191,392 $228,676 
(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
2021$9,130 
2022$9,130 
2023$9,130 
2024$9,130 
2025$9,130 
Maturities of Lease Liabilities The maturities of our lease liabilities at December 31, 2020 were as follows (amounts in thousands):
2021$3,348 
20221,926 
20231,182 
2024697 
2025507 
Thereafter2,828 
Total lease payments$10,488 
Less: Interest(1,722)
Present value of lease liabilities (1)
$8,766 
(1)Includes current lease liabilities of $3.3 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,
 202020192018
 (In thousands)
Balance at beginning of period$8,006 $9,583 $4,202 
Additions6,803 — 9,443 
Interest expense (1)
(2,540)(1,577)(4,062)
Balance at end of period$12,269 $8,006 $9,583 
(1)Includes the recognition of prior deferred debt issuance costs associated with former credit facilities of $(0.7) million and $(2.4) million for the years ended December 31, 2020 and 2018, respectively.
Asset Retirement Obligations The following summarizes the changes in the carrying amount of these liabilities:
 Year Ended December 31,
 202020192018
 (In thousands)
Balance at beginning of period$77,288 $90,822 $78,036 
Costs incurred(1,608)(10,380)(1,011)
Additions/adjustments(3,284)(5,030)8,000 
Acquisitions— — 2,062 
Accretion5,343 5,379 5,523 
Translation and other (1)
371 (3,503)(1,788)
Balance at end of period (2)
$78,110 $77,288 $90,822 
(1)Includes an adjustment of $(4.3) million to correct the business combination accounting for our 2016 acquisition during the year ended December 31, 2019.
(2)Includes current asset retirement obligations of $2.8 million, $5.7 million and $13.8 million at December 31, 2020, 2019 and 2018, respectively.
Accumulated Other Comprehensive Income
The components of Accumulated other comprehensive income included in Stockholders' Equity are as follows:
 December 31,
 20202019
 (In thousands)
Currency translation adjustments$24,454 $8,769 
Net unrealized (loss) gain on derivative financial instruments(496)64 
Unrecognized prior service cost on benefit obligations(15,902)(16,614)
Net unrealized gain on available-for-sale investments142 333 
Accumulated other comprehensive income$8,198 $(7,448)
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, 
 202020192018 
Accumulated Other Comprehensive Income (Loss) Component Recognized
(In thousands)Line Item Presented
Realized (loss) gain on derivative financial instruments
$(35)$(132)$(242)
Revenues
695 (1,066)407 
Cost of operations
660 (1,198)165 
Total before tax
(173)310 (47)
Provision for Income Taxes
$487 $(888)$118 
Net Income
Amortization of prior service cost on benefit obligations
$(3,177)$(2,592)$(1,910)
Other – net
645 562 410 
Provision for Income Taxes
$(2,532)$(2,030)$(1,500)
Net Income
Realized gains on investments
$— $— $3 
Other – net
— — (1)
Provision for Income Taxes
$— $— $2 
Net Income
Total reclassification for the period
$(2,045)$(2,918)$(1,380)