10-Q

Table of Contents

United States

Securities and Exchange Commission

Washington, D.C. 20549

FORM 10-Q 

(Mark One)

☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended June 26, 2021

OR

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from ___ to ___

Commission file number 0-20388

LITTELFUSE, INC. 

(Exact name of registrant as specified in its charter)

Delaware		36-3795742
(State or other jurisdiction of incorporation or organization)		(I.R.S. Employer Identification No.)
8755 West Higgins Road
Suite 500
Chicago	Illinois	60631
(Address of principal executive offices)		(ZIP Code)

Registrant’s telephone number, including area code: 773-628-1000

Securities registered pursuant to Section 12(b) of the Act:

Title of Each Class	Trading Symbol	Name of exchange on which registered
Common Stock, $0.01 par value	LFUS	NASDAQ	Global Select Market

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes [X] No [ ]

Indicate by check mark whether the registrant has submitted electronically, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (Section 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes [X] No ☐

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate website, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (Section 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes [X] No [ ]

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act (Check one): Large accelerated filer [X] Accelerated filer [ ] Non-accelerated filer [ ] Smaller reporting company ☐ Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. Yes [ ] No [ ]

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ☐ No [X]

As of July 23, 2021, the registrant had outstanding 24,617,137 shares of Common Stock, net of Treasury Shares.

Table of Contents

TABLE OF CONTENTS

		Page
PART I	FINANCIAL INFORMATION
Item 1.	Financial Statements
	Condensed Consolidated Balance Sheets as of June 26, 2021 (unaudited) and December 26, 2020	3
	Condensed Consolidated Statements of Net Income (Loss) for the three and six months ended June 26, 2021 (unaudited) and June 27, 2020 (unaudited)	4
	Condensed Consolidated Statements of Comprehensive Income (Loss) for the three and six months ended June 26, 2021 (unaudited) and June 27, 2020 (unaudited)	5
	Condensed Consolidated Statements of Cash Flows for the six months ended June 26, 2021 (unaudited) and June 27, 2020 (unaudited)	6
	Condensed Consolidated Statements of Stockholders' Equity for the six months ended June 26, 2021 (unaudited) and June 27, 2020 (unaudited)	7
	Notes to Condensed Consolidated Financial Statements (unaudited)	9
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	28
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	38
Item 4.	Controls and Procedures	38
PART II	OTHER INFORMATION
Item 1.	Legal Proceedings	38
Item 1A.	Risk Factors	38
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	38
Item 3.	Defaults Upon Senior Securities	39
Item 4.	Mine Safety Disclosures	39
Item 5.	Other Information	39
Item 6.	Exhibits	39
Signatures		40

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LITTELFUSE, INC.

CONDENSED CONSOLIDATED BALANCE SHEETS

	(Unaudited)
(in thousands)	June 26, 2021		December 26, 2020
ASSETS
Current assets:
Cash and cash equivalents	$	616,330	$	687,525
Short-term investments	18		54
Trade receivables, less allowances of $46,328 and $45,237 at June 26, 2021 and December 26, 2020, respectively	313,332		232,760
Inventories	325,774		258,002
Prepaid income taxes and income taxes receivable	3,961		3,029
Prepaid expenses and other current assets	59,503		35,939
Total current assets	1,318,918		1,217,309
Net property, plant, and equipment	352,826		344,178
Intangible assets, net of amortization	307,771		291,887
Goodwill	851,070		816,812
Investments	39,255		30,547
Deferred income taxes	9,837		11,224
Right of use lease assets, net	28,465		17,615
Other assets	19,356		18,021
Total assets	$	2,927,498	$	2,747,593
LIABILITIES AND EQUITY
Current liabilities:
Accounts payable	$	205,138	$	145,984
Accrued liabilities	126,445		110,478
Accrued income taxes	25,109		19,186
Current portion of long-term debt	25,000		—
Total current liabilities	381,692		275,648
Long-term debt, less current portion	626,917		687,034
Deferred income taxes	47,518		50,134
Accrued post-retirement benefits	43,176		45,802
Non-current operating lease liabilities	19,241		12,950
Other long-term liabilities	66,734		67,252
Shareholders’ equity:
Common stock, par value $0.01 per share: 34,000,000 shares authorized; shares issued, June 26, 2021–26,280,882; December 26, 2020–26,131,544	260		259
Additional paid-in capital	930,106		907,858
Treasury stock, at cost: 1,664,200 and 1,644,283 shares, respectively	(247,963)		(242,366)
Accumulated other comprehensive loss	(90,574)		(91,157)
Retained earnings	1,150,260		1,034,048
Littelfuse, Inc. shareholders’ equity	1,742,089		1,608,642
Non-controlling interest	131		131
Total equity	1,742,220		1,608,773
Total liabilities and equity	$	2,927,498	$	2,747,593

See accompanying Notes to Condensed Consolidated Financial Statements.

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LITTELFUSE, INC.

CONDENSED CONSOLIDATED STATEMENTS OF NET INCOME (LOSS)

(Unaudited)

	Three Months Ended				Six Months Ended
(in thousands, except per share data)	June 26, 2021		June 27, 2020		June 26, 2021		June 27, 2020
Net sales	$	523,488	$	307,337	$	987,282	$	653,433
Cost of sales	326,092		207,435		629,420		429,175
Gross profit	197,396		99,902		357,862		224,258
Selling, general, and administrative expenses	73,315		53,199		131,603		104,399
Research and development expenses	16,394		13,161		31,133		27,624
Amortization of intangibles	10,641		9,827		21,162		19,808
Restructuring, impairment, and other charges	789		35,665		1,226		39,627
Total operating expenses	101,139		111,852		185,124		191,458
Operating income (loss)	96,257		(11,950)		172,738		32,800
Interest expense	4,626		5,855		9,299		11,273
Foreign exchange (gain) loss	(1,676)		(6,010)		5,161		(3,426)
Other (income) expense, net	(1,890)		(1,210)		(9,627)		39
Income (loss) before income taxes	95,197		(10,585)		167,905		24,914
Income taxes	13,102		(1,594)		28,097		9,261
Net income (loss)	$	82,095	$	(8,991)	$	139,808	$	15,653
Earnings (loss) per share:
Basic	$	3.34	$	(0.37)	$	5.69	$	0.64
Diluted	$	3.30	$	(0.37)	$	5.62	$	0.64
Weighted-average shares and equivalent shares outstanding:
Basic	24,592		24,312		24,562		24,353
Diluted	24,900		24,312		24,894		24,520

See accompanying Notes to Condensed Consolidated Financial Statements.

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LITTELFUSE, INC.

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)

(Unaudited)

	Three Months Ended				Six Months Ended
(in thousands)	June 26, 2021		June 27, 2020		June 26, 2021		June 27, 2020
Net income (loss)	$	82,095	$	(8,991)	$	139,808	$	15,653
Other comprehensive income (loss):
Pension and postemployment adjustment, net of tax	329		(10,839)		783		(10,278)
Foreign currency translation adjustments	5,125		8,422		(200)		(7,118)
Comprehensive income (loss)	$	87,549	$	(11,408)	$	140,391	$	(1,743)

See accompanying Notes to Condensed Consolidated Financial Statements.

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LITTELFUSE, INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited)

	Six Months Ended
(in thousands)	June 26, 2021		June 27, 2020
OPERATING ACTIVITIES
Net income	$	139,808	$	15,653
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	27,251		27,728
Amortization of intangibles	21,162		19,808
Deferred revenue	(316)		(289)
Non-cash inventory charges	6,807		—
Impairment charges	—		36,078
Stock-based compensation	12,238		10,852
(Gain) loss on investments and other assets	(8,865)		542
Deferred income taxes	(2,172)		2,512
Other	7,842		(1,222)
Changes in operating assets and liabilities:
Trade receivables	(69,881)		13,914
Inventories	(38,205)		(10,761)
Accounts payable	38,955		3,439
Accrued liabilities and income taxes	4,488		(19,144)
Prepaid expenses and other assets	(12,766)		2,176
Net cash provided by operating activities	126,346		101,286
INVESTING ACTIVITIES
Acquisitions of businesses, net of cash acquired	(109,852)		—
Purchases of property, plant, and equipment	(32,657)		(29,479)
Net proceeds from sale of property, plant and equipment, and other	2,569		89
Net cash used in investing activities	(139,940)		(29,390)
FINANCING ACTIVITIES
Proceeds of revolving credit facility	—		240,000
Payments of revolving credit facility	(30,000)		—
Payments of term loan	—		(145,000)
Net proceeds related to stock-based award activities	4,413		3,642
Purchases of common stock	—		(22,927)
Debt issuance costs	—		(1,786)
Cash dividends paid	(23,596)		(23,403)
Net cash (used in) provided by financing activities	(49,183)		50,526
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	(2,894)		(1,694)
(Decrease) increase in cash, cash equivalents, and restricted cash	(65,671)		120,728
Cash, cash equivalents, and restricted cash at beginning of period	687,525		531,139
Cash, cash equivalents, and restricted cash at end of period	$	621,854	$	651,867
Supplementary Cash Flow Information
Reconciliation of cash and cash equivalents:
Cash and cash equivalents	$	616,330	$	651,867
Restricted cash included in prepaid expenses and other current assets	$	3,790	—
Restricted cash included in other assets	$	1,734	$	—
Cash paid during the period for interest	$	8,719	$	10,799
Capital expenditures, not yet paid	$	6,826	$	4,665

 See accompanying Notes to Condensed Consolidated Financial Statements.

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LITTELFUSE, INC.

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY

(Unaudited)

	Littelfuse, Inc. Shareholders’ Equity
(in thousands, except share and per share data)	Common Stock		Addl. Paid in Capital		Treasury Stock		Accum. Other Comp. (Loss)		Retained Earnings		Non-controlling Interest		Total
Balance at December 26, 2020	$	259	$	907,858	$	(242,366)	$	(91,157)	$	1,034,048	$	131	$	1,608,773
Net income	—		—		—		—		57,713		—		57,713
Other comprehensive loss, net of tax	—		—		—		(4,871)		—		—		(4,871)
Stock-based compensation	—		3,395		—		—		—		—		3,395
Stock options exercised	—		7,509		—		—		—		—		7,509
Cash dividends paid ($0.48 per share)	—		—		—		—		(11,782)		—		(11,782)
Balance at March 27, 2021	$	259	$	918,762	$	(242,366)	$	(96,028)	$	1,079,979	$	131	$	1,660,737
Net income	—		—		—		—		82,095		—		82,095
Other comprehensive loss, net of tax	—		—		—		5,454		—		—		5,454
Stock-based compensation	—		8,843		—		—		—		—		8,843
Withheld shares on restricted share units for withholding taxes	—		—		(5,597)		—		—		—		(5,597)
Stock options exercised	1		2,501		—		—		—		—		2,502
Cash dividends paid ($0.48 per share)	—		—		—		—		(11,814)		—		(11,814)
Balance at June 26, 2021	$	260	$	930,106	$	(247,963)	$	(90,574)	$	1,150,260	$	131	$	1,742,220

See accompanying Notes to Condensed Consolidated Financial Statements.

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	Littelfuse, Inc. Shareholders’ Equity
(in thousands, except share and per share data)	Common Stock		Addl. Paid in Capital		Treasury Stock		Accum. Other Comp. (Loss)		Retained Earnings		Non-controlling Interest		Total
Balance at December 28, 2019	$	256	$	867,996	$	(216,447)	$	(106,823)	$	950,901	$	131	$	1,496,014
Net income	—		—		—		—		24,644		—		24,644
Other comprehensive loss, net of tax	—		—		—		(14,979)		—		—		(14,979)
Stock-based compensation	—		2,965		—		—		—		—		2,965
Withheld shares on restricted share units for withholding taxes	—		—		(443)		—		—		—		(443)
Stock options exercised	—		3,399		—		—		—		—		3,399
Repurchases of common stock	—		—		(22,927)		—		—		—		(22,927)
Cash dividends paid ($0.48 per share)	—		—		—		—		(11,725)		—		(11,725)
Balance at March 28, 2020	$	256	$	874,360	$	(239,817)	$	(121,802)	$	963,820	$	131	$	1,476,948
Net loss	—		—		—		—		(8,991)		—		(8,991)
Other comprehensive loss, net of tax	—		—		—		(2,417)		—		—		(2,417)
Stock-based compensation	—		7,887		—		—		—		—		7,887
Withheld shares on restricted share units for withholding taxes	—		—		(2,375)		—		—		—		(2,375)
Stock options exercised	1		3,059		—		—		—		—		3,060
Cash dividends paid ($0.48 per share)	—		—		—		—		(11,678)		—		(11,678)
Balance at June 27, 2020	$	257	$	885,306	$	(242,192)	$	(124,219)	$	943,151	$	131	$	1,462,434

See accompanying Notes to Condensed Consolidated Financial Statements.

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Notes to Condensed Consolidated Financial Statements 

1. Summary of Significant Accounting Policies and Other Information

Nature of Operations 

Founded in 1927, Littelfuse is an industrial technology manufacturing company empowering a sustainable, connected, and safer world. Across more than 15 countries, and with 12,000 global associates, we partner with customers to design and deliver innovative, reliable solutions. Serving over 100,000 end customers, our products are found in a variety of industrial, transportation and electronics end markets – everywhere, every day.

Basis of Presentation 

The Company’s accompanying unaudited Condensed Consolidated Financial Statements have been prepared in accordance with U.S. Generally Accepted Accounting Principles (“GAAP”) for interim financial information, the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, certain information and disclosures normally included in the consolidated balance sheets, statements of net income and comprehensive income, statements of cash flows, and statement of stockholders' equity prepared in conformity with U.S. GAAP have been condensed or omitted as permitted by such rules and regulations, although the Company believes that the disclosures made are adequate to make the information not misleading. They have been prepared in accordance with accounting policies described in the Company’s Annual Report on Form 10-K for the fiscal year ended December 26, 2020 which should be read in conjunction with the disclosures therein. In the opinion of management, all adjustments considered necessary for a fair presentation have been included and are of a normal, recurring nature. Operating results for interim periods are not necessarily indicative of annual operating results.

Revenue Recognition

Revenue Disaggregation

The following tables disaggregate the Company’s revenue by primary business units for the three and six months ended June 26, 2021 and June 27, 2020:

	Three Months Ended June 26, 2021								Six Months Ended June 26, 2021
(in thousands)	Electronics Segment		Automotive Segment		Industrial Segment		Total		Electronics Segment		Automotive Segment		Industrial Segment		Total
Electronics – Passive Products and Sensors	$	155,276	$	—	$	—	$	155,276	$	287,713	$	—	$	—	$	287,713
Electronics – Semiconductor	170,071		—		—		170,071		324,169		—		—		324,169
Passenger Car Products	—		68,048		—		68,048		—		135,949		—		135,949
Automotive Sensors	—		26,685		—		26,685		—		54,969		—		54,969
Commercial Vehicle Products	—		38,585		—		38,585		—		70,929		—		70,929
Industrial Products	—		—		64,823		64,823		—		—		113,553		113,553
Total	$	325,347	$	133,318	$	64,823	$	523,488	$	611,882	$	261,847	$	113,553	$	987,282

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	Three Months Ended June 27, 2020								Six Months Ended June 27, 2020
(in thousands)	Electronics Segment		Automotive Segment		Industrial Segment		Total		Electronics Segment		Automotive Segment		Industrial Segment		Total
Electronics – Passive Products and Sensors	$	92,846	$	—	$	—	$	92,846	$	177,444	$	—	$	—	$	177,444
Electronics – Semiconductor	130,425		—		—		130,425		260,016		—		—		260,016
Passenger Car Products	—		30,309		—		30,309		—		82,954		—		82,954
Automotive Sensors	—		13,899		—		13,899		—		38,073		—		38,073
Commercial Vehicle Products	—		17,791		—		17,791		—		45,742		—		45,742
Industrial Products	—		—		22,067		22,067		—		—		49,204		49,204
Total	$	223,271	$	61,999	$	22,067	$	307,337	$	437,460	$	166,769	$	49,204	$	653,433

See Note 15, Segment Information for net sales by segment and countries.

Revenue Recognition

The Company recognizes revenue on product sales in the period in which the Company satisfies its performance obligation and control of the product is transferred to the customer. The Company’s sales arrangements with customers are predominately short term in nature and generally provide for transfer of control at the time of shipment as this is the point at which title and risk of loss of the product transfers to the customer. At the end of each period, for those shipments where title to the products and the risk of loss and rewards of ownership do not transfer until the product has been received by the customer, the Company adjusts revenues and cost of sales for the delay between the time that the products are shipped and when they are received by the customer. The amount of revenue recorded reflects the consideration to which the Company expects to be entitled in exchange for goods and may include adjustments for customer allowance, rebates and price adjustments. The Company’s distribution channels are primarily through direct sales and independent third-party distributors.

The Company elected the practical expedient under Accounting Standards Codification ("ASC") 340-40-25-4 to expense commissions when incurred as the amortization period of the commission asset the Company would have otherwise recognized is less than one year.

Revenue and Billing

The Company generally accepts orders from customers through receipt of purchase orders or electronic data interchange based on written sales agreements and purchasing contracts. Contract pricing and selling agreement terms are based on market factors, costs, and competition. Pricing is often negotiated as an adjustment (premium or discount) from the Company’s published price lists. The customer is invoiced when the Company’s products are shipped to them in accordance with the terms of the sales agreement. As the Company’s standard payment terms are less than one year, the Company elected the practical expedient under ASC 606-10-32-18 to not assess whether a contract has a significant financing component. The Company also elected the practical expedient provided in ASC 606-10-25-18B to treat all product shipping and handling activities as fulfillment activities, and therefore recognize the gross revenue associated with the contract, inclusive of any shipping and handling revenue.

Ship and Debit Program

Some of the terms of the Company’s sales agreements and normal business conditions provide customers (distributors) the ability to receive price adjustments on products previously shipped and invoiced. This practice is common in the industry and is referred to as a “ship and debit” program. This program allows the distributor to debit the Company for the difference between the distributors’ contracted price and a lower price for specific transactions. Under certain circumstances (usually in a competitive situation or large volume opportunity), a distributor will request authorization for pricing allowances to reduce its price. When the Company approves such a reduction, the distributor is authorized to “debit” its account for the difference between the contracted price and the lower approved price. The Company establishes reserves for this program based on historic activity, electronic distributor inventory levels and actual authorizations for the debit and recognizes these debits as a reduction of revenue.

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Return to Stock 

The Company has a return to stock policy whereby certain customers, with prior authorization from Littelfuse management, can return previously purchased goods for full or partial credit. The Company establishes an estimated allowance for these returns based on historic activity. Sales revenue and cost of sales are reduced to anticipate estimated returns.

Volume Rebates

The Company offers volume based sales incentives to certain customers to encourage greater product sales. If customers achieve their specific quarterly or annual sales targets, they are entitled to rebates. The Company estimates the projected amount of rebates that will be achieved by the customer and recognizes this estimated cost as a reduction to revenue as products are sold.

Cash, Cash Equivalents and Restricted Cash

The following table provides a reconciliation of cash, cash equivalents and restricted cash at June 26, 2021 and December 26, 2020 reported within the Condensed Consolidated Balance Sheets that sum to the total of the same such amounts shown in the Condensed Consolidated Statement of Cash Flows.

(in thousands)	June 26, 2021		December 26, 2020
Cash and cash equivalents	$	616,330	$	687,525
Restricted cash included in prepaid expenses and other current assets	3,790		—
Restricted cash included in other assets	1,734		$	—
Total cash, cash equivalents and restricted cash	$	621,854	$	687,525

Recently Adopted Accounting Standards

In December 2019, the Financial Accounting Standards Board (FASB) issued Accounting Standard Update ("ASU") No. 2019-12, "Income Taxes (Topic 740) - Simplifying the Accounting for Income Taxes" as part of its initiative to reduce complexity in the accounting standards. The guidance is effective for fiscal years beginning after December 15, 2020 with early adoption permitted. The adoption of ASU 2019-12 did not have a material impact on our Condensed Consolidated Financial Statements.

2. Acquisitions

The Company accounts for acquisitions using the acquisition method in accordance with ASC 805, “Business Combinations,” in which assets acquired and liabilities assumed are recorded at fair value as of the date of acquisition. The operating results of the acquired business are included in the Company’s Consolidated Financial Statements from the date of the acquisition.

Hartland Controls

On January 28, 2021, the Company acquired Hartland Controls ("Hartland"), a manufacturer and leading supplier of electrical components used primarily in heating, ventilation, air conditioning (HVAC) and other industrial and control systems applications with annualized sales of approximately $70 million. The purchase price for Hartland was approximately $112.3 million and the operations of Hartland are included in the Industrial segment.

The total purchase consideration of $109.9 million, net of cash, cash equivalents, and restricted cash has been allocated, on a preliminary basis, to assets acquired and liabilities assumed, as of the completion of the acquisition, based on preliminary estimated fair values. The purchase consideration is subject to change for the final working capital adjustments. As of June 26, 2021, the Company had restricted cash of $1.7 million in an escrow account for general indemnification purposes. The purchase price allocation is preliminary because the evaluations necessary to assess the fair values of the net assets acquired are still in process. The primary areas that are not yet finalized relate to the completion of the valuation of certain contingent liabilities. As a result, these allocations are subject to change during the purchase price allocation period as the valuations are finalized.

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The following table summarizes the purchase price allocation of the fair value of assets acquired and liabilities assumed in the Hartland acquisition:

(in thousands)	Purchase Price Allocation
Total purchase consideration:
Cash, net of cash acquired, and restricted cash	$	109,852
Allocation of consideration to assets acquired and liabilities assumed:
Trade receivables, net	13,027
Inventories	35,808
Other current assets	2,224
Property, plant, and equipment	6,296
Intangible assets	39,660
Goodwill	40,442
Other non-current assets	3,787
Current liabilities	(24,846)
Other non-current liabilities	(6,546)
	$	109,852

During the three months ended June 26, 2021, the Company recorded a cumulative net measurement period adjustment that increased goodwill by $ 1.5 million and resulted in a decrease to the fair value assigned to trade receivables, inventories and net current liabilities of $1.3 million, $0.5 million and $0.3 million, respectively. The measurement period adjustment was primarily associated with certain contingent liabilities and customer settlements. The Company made these measurement period adjustments to reflect facts and circumstances that existed as of the acquisition date.

All Hartland goodwill, other assets and liabilities were recorded in the Industrial segment and are primarily reflected in the Americas and Asia-Pacific geographic areas. The goodwill resulting from this acquisition consists largely of the Company’s expected future product sales and synergies from combining Hartland’s products and technology with the Company’s existing industrial products portfolio. Goodwill resulting from the Hartland acquisition is not expected to be deductible for tax purposes.

Included in the Company’s Condensed Consolidated Statements of Net Income for the three and six months ended June 26, 2021 are net sales of approximately $26.4 million and $43.1 million respectively, and a loss before income taxes of $0.3 million and $2.5 million, respectively since the January 28, 2021 acquisition of Hartland.

The Company recorded a $6.8 million step-up of inventory to its fair value as of the acquisition date based on the preliminary valuation. The step-up was amortized as a non-cash charge to cost of goods sold during the first and second quarters of 2021, as the acquired inventory was sold, and is reflected as other non-segment costs. During the three and six months ended June 26, 2021, the Company recognized a charge of $3.3 million and $6.8 million for the amortization of this fair value inventory step-up.

During the three and six months ended June 26, 2021, the Company incurred approximately $0.1 million and $0.8 million of legal and professional fees related to this acquisition recognized as Selling, general, and administrative expenses. These costs were reflected as other non-segment costs.

Pro Forma Results

The following table summarizes, on an unaudited pro forma basis, the combined results of operations of the Company and Hartland as though the acquisition had occurred as of December 29, 2019. The pro forma amounts presented are not necessarily indicative of either the actual consolidated results had the Hartland acquisition occurred as of December 29, 2019 or of future consolidated operating results.

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	For the Three Months Ended				For the Six Months Ended
(in thousands, except per share amounts)	June 26, 2021		June 27, 2020		June 26, 2021		June 27, 2020
Net sales	$	523,488	$	323,713	$	994,320	$	687,330
Income (loss) before income taxes	98,644		(10,392)		175,939		21,039
Net income (loss)	84,818		(8,873)		146,143		12,565
Net income (loss) per share — basic	3.45		(0.36)		5.95		0.52
Net income (loss) per share — diluted	3.41		(0.36)		5.87		0.51

Pro forma results presented above primarily reflect the following adjustments:

	For the Three Months Ended				For the Six Months Ended
(in thousands)	June 26, 2021		June 27, 2020		June 26, 2021		June 27, 2020
Amortization(a)	$	—	$	(837)	$	(280)	$	(1,676)
Depreciation	—		47		7		95
Transaction costs(b)	128		(128)		835		(835)
Amortization of inventory step-up(c)	3,319		(1,659)		6,808		(6,796)
Income tax (expense) benefit of above items	(724)		541		(1,555)		1,940

(a)The amortization adjustment for the three and six months ended June 27, 2020 primarily reflects incremental amortization resulting for the measurement of intangibles at their fair values.

(b)The transaction cost adjustments reflect the reversal of certain legal and professional fees from the three and six months ended June 26, 2021 and recognition of those fees during the three and six months ended June 27, 2020.

(c)The amortization of inventory step-up adjustment reflects the reversal of the amount recognized during the three and six months ended June 26, 2021 and the recognition of the amortization during the three and six months ended June 27, 2020. The inventory step-up was amortized over four months as the inventory was sold.

3. Inventories

The components of inventories at June 26, 2021 and December 26, 2020 are as follows:

(in thousands)	June 26, 2021		December 26, 2020
Raw materials	$	111,769	$	85,394
Work in process	106,552		92,783
Finished goods	142,777		114,641
Inventory Reserves	(35,324)		(34,816)
Total	$	325,774	$	258,002

4. Property, Plant, and Equipment

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The components of net property, plant, and equipment at June 26, 2021 and December 26, 2020 are as follows:

(in thousands)	June 26, 2021		December 26, 2020
Land	$	21,795	$	22,851
Building	128,528		123,497
Equipment	706,115		678,220
Accumulated depreciation and amortization	(503,612)		(480,390)
Total	$	352,826	$	344,178

The Company recorded depreciation expense of $13.6 million and $13.9 million for the three months ended June 26, 2021 and June 27, 2020, respectively, and $27.3 million and $27.7 million for the six months ended June 26, 2021 and June 27, 2020, respectively.

5. Goodwill and Other Intangible Assets

The amounts for goodwill and changes in the carrying value by segment for the six months ended June 26, 2021 are as follows:

(in thousands)	Electronics		Automotive		Industrial		Total
Net book value of goodwill as of December 26, 2020
Gross goodwill as of December 26, 2020	$	676,325	$	138,354	$	47,551	$	862,230
Accumulated impairment losses as of December 26, 2020	—		(36,423)		(8,995)		(45,418)
Total	676,325		101,931		38,556		816,812
Changes during 2021:
Additions(a)	—		—		40,442		40,442
Currency translation	(4,779)		(1,542)		137		(6,184)
Net book value of goodwill as of June 26, 2021
Gross goodwill as of June 26, 2021	671,546		136,699		88,130		896,375
Accumulated impairment losses as of June 26, 2021	—		(36,310)		(8,995)		(45,305)
Total	$	671,546	$	100,389	$	79,135	$	851,070

(a) The additions resulted from the acquisition of Hartland.

The Company tests its goodwill annually for impairment on the first day of its fiscal fourth quarter, or more frequently if an event occurs or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying value. During the second quarter of 2020, the Company recorded a non-cash charge of $33.8 million to recognize the impairment of goodwill in the automotive sensors reporting unit within the Automotive segment. The goodwill impairment charge was determined using Level 3 inputs, including discounted cash flow analysis and comparable marketplace fair value data. As of June 26, 2021, the automotive sensors reporting unit had $9.6 million of remaining goodwill.

The components of other intangible assets as of June 26, 2021 and December 26, 2020 are as follows:

	As of June 26, 2021
(in thousands)	Gross Carrying Value		Accumulated Amortization		Net Book Value
Land use rights	$	10,392	$	2,177	$	8,215
Patents, licenses and software	143,717		97,977		45,740
Distribution network	43,762		39,941		3,821
Customer relationships, trademarks, and tradenames	401,722		151,727		249,995
Total	$	599,593	$	291,822	$	307,771

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	As of December 26, 2020
(in thousands)	Gross Carrying Value		Accumulated Amortization		Net Book Value
Land use rights	$	10,280	$	2,007	$	8,273
Patents, licenses and software	137,210		92,868		44,342
Distribution network	43,910		38,980		4,930
Customer relationships, trademarks, and tradenames	372,064		137,722		234,342
Total	$	563,464	$	271,577	$	291,887

During the three months ended June 26, 2021 and June 27, 2020, the Company recorded amortization expense of $10.6 million and $9.8 million, respectively. During the six months ended June 26, 2021 and June 27, 2020, the Company recorded amortization expense of $21.2 million and $19.8 million, respectively.

The Company recognized a $0.3 million non-cash impairment charge in the first quarter of 2020 on a certain patent triggered by the Company’s announcement to consolidate a manufacturing facility within the Industrial segment.

During the six months ended June 26, 2021, the Company recorded additions to intangible assets of $39.7 million, related to the Hartland acquisition, the components of which were as follows:

(in thousands)	Weighted Average Useful Life	Amount
Patents, licenses and software	9.2	$	7,559
Customer relationships, trademarks, and tradenames	13.7	32,101
Total		$	39,660

Estimated annual amortization expense related to intangible assets with definite lives as of June 26, 2021 is as follows:

(in thousands)	Amount
2021	$	41,868
2022	40,877
2023	36,569
2024	33,135
2025	32,682
2026 and thereafter	143,802
Total	$	328,933

6. Accrued Liabilities

The components of accrued liabilities as of June 26, 2021 and December 26, 2020 are as follows:

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(in thousands)	June 26, 2021		December 26, 2020
Employee-related liabilities	$	64,909	$	50,689
Operating lease liability	8,853		6,811
Other non-income taxes	8,815		2,126
Interest	4,506		4,517
Professional services	2,962		3,321
Deferred revenue	2,444		2,959
Restructuring liability	1,109		4,195
Customer liability	790		3,858
Other	32,057		32,002
Total	$	126,445	$	110,478

Employee-related liabilities consist primarily of payroll, sales commissions, bonus, employee benefit accruals and workers’ compensation. Bonus accruals include amounts earned pursuant to the Company’s primary employee incentive compensation plans. Other accrued liabilities include miscellaneous operating accruals and other client-related liabilities.

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7. Restructuring, Impairment, and Other Charges

The Company recorded restructuring, impairment and other charges for the three and six months ended June 26, 2021 and June 27, 2020 as follows:

	Three months ended June 26, 2021								Six months ended June 26, 2021
(in thousands)	Electronics		Automotive		Industrial		Total		Electronics		Automotive		Industrial		Total
Employee terminations	$	295	$	416	$	6	$	717	$	552	$	416	$	169	$	1,137
Other restructuring charges	—		72		—		72		—		89		—		89
Total restructuring charges	295		488		6		789		552		505		169		1,226
Total	$	295	$	488	$	6	$	789	$	552	$	505	$	169	$	1,226

	Three months ended June 27, 2020								Six months ended June 27, 2020
(in thousands)	Electronics		Automotive		Industrial		Total		Electronics		Automotive		Industrial		Total
Employee terminations	$	856	$	209	$	750	$	1,815	$	1,737	$	608	$	1,071	$	3,416
Other restructuring charges	(1)		(12)		22		9		—		108		25		133
Total restructuring charges	855		197		772		1,824		1,737		716		1,096		3,549
Impairment	—		33,841		—		33,841		—		33,841		2,237		36,078
Total	$	855	$	34,038	$	772	$	35,665	$	1,737	$	34,557	$	3,333	$	39,627

2021

For the three and six months ended June 26, 2021, the Company recorded total restructuring charges of $0.8 million and $1.2 million, primarily for employee termination costs. These charges are primarily related to the reorganization of certain manufacturing, selling and administrative functions within the Automotive and Electronics segments.

2020

For the three and six months ended June 27, 2020, the Company recorded total restructuring charges of $1.8 million and $3.5 million, respectively, for employee termination costs and other restructuring charges. These charges are primarily related to the reorganization of certain manufacturing, selling and administrative functions across all segments and the announced consolidation of a manufacturing facility within the Industrial segment. The Company also recognized $33.8 million and $36.1 million of impairment charges for the three and six months ended June 27, 2020, respectively, which included a $33.8 million goodwill impairment charge associated with the automotive sensors reporting unit within the Automotive segment in the second quarter of 2020 and $2.2 million related to the land and building associated with the Company’s previously announced consolidation of a manufacturing facility within the Industrial segment in the first quarter of 2020. The impairment charges of the land and building were included in selling, genera,l and administrative expenses. See Note 5, Goodwill and Other Intangible Assets for further discussion regarding the goodwill impairment charge.

The restructuring liability as of June 26, 2021 and December 26, 2020 is $2.9 million and $4.2 million, respectively. The current portion of the total restructuring liability included within accrued liabilities is $1.1 million while the long-term balance of $1.8 million was included within other long-term liabilities, respectively, in the Condensed Consolidated Balance Sheets as of June 26, 2021. The Company anticipates the remaining payments associated with employee terminations will primarily be completed by the third quarter of 2022.

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8. Debt

The carrying amounts of debt at June 26, 2021 and December 26, 2020 are as follows:

(in thousands)	June 26, 2021		December 26, 2020
Revolving Credit Facility	$	100,000	$	130,000
Euro Senior Notes, Series A due 2023	139,610		142,679
Euro Senior Notes, Series B due 2028	113,359		115,850
U.S. Senior Notes, Series A due 2022	25,000		25,000
U.S. Senior Notes, Series B due 2027	100,000		100,000
U.S. Senior Notes, Series A due 2025	50,000		50,000
U.S. Senior Notes, Series B due 2030	125,000		125,000
Other	2,619		2,619
Unamortized debt issuance costs	(3,671)		(4,114)
Total debt	651,917		687,034
Less: Current maturities	(25,000)		—
Total long-term debt	$	626,917	$	687,034

Revolving Credit Facility

On April 3, 2020, the Company amended its Credit Agreement to effect certain changes, including, among others: (i) eliminating the $200.0 million unsecured term loan credit facility, the remaining outstanding balance ($140.0 million) of which was repaid in full on April 3, 2020 through the revolving credit facility; (ii) making certain financial and non-financial covenants less restrictive on the Company; (iii) modifying performance-based interest rate margins and undrawn fees; and (iv) extending the maturity date to April 3, 2025. The amended Credit Agreement also allows the Company to increase the size of the revolving credit facility or enter into one or more tranches of term loans if there is no event of default and the Company is in compliance with certain financial covenants. The Company made payments of $30.0 million on the amended revolving credit facility during the six months ended June 26, 2021. The balance under the facility was $100.0 million as of June 26, 2021.

Outstanding borrowings under the amended Credit Agreement bears interest, at the Company’s option, at either LIBOR, fixed for interest periods of one, two, three or six-month periods, plus 1.25% to 2.00%, or at the bank’s Base Rate, as defined, plus 0.25% to 1.00%, based upon the Company’s Consolidated Leverage Ratio, as defined. The Company is also required to pay commitment fees on unused portions of the credit agreement ranging from 0.125% to 0.20%, based on the Consolidated Leverage Ratio, as defined in the agreement. The amended Credit Agreement includes representations, covenants and events of default that are customary for financing transactions of this nature. The effective interest rate on outstanding borrowings under the credit facility was 1.59% at June 26, 2021.

As of June 26, 2021, the Company had no amount outstanding in letters of credit and had available $600.0 million of borrowing capacity under the Revolving Credit Facility. At June 26, 2021, the Company was in compliance with all covenants under the Credit Agreement.

Senior Notes

On December 8, 2016, the Company entered into a Note Purchase Agreement, pursuant to which the Company issued and sold €212 million aggregate principal amount of senior notes in two series. The funding date for the Euro denominated senior notes occurred on December 8, 2016 for €117 million in aggregate amount of 1.14% Senior Notes, Series A, due December 8, 2023 (“Euro Senior Notes, Series A due 2023”), and €95 million in aggregate amount of 1.83% Senior Notes, Series B due December 8, 2028 (“Euro Senior Notes, Series B due 2028”) (together, the “Euro Senior Notes”). Interest on the Euro Senior Notes is payable semiannually on June 8 and December 8, commencing June 8, 2017.

On December 8, 2016, the Company entered into a Note Purchase Agreement, pursuant to which the Company issued and sold $125 million aggregate principal amount of senior notes in two series. On February 15, 2017, $25 million in aggregate principal amount of 3.03% Senior Notes, Series A, due February 15, 2022 (“U.S. Senior Notes, Series A due 2022”), and $100 million in aggregate principal amount of 3.74% Senior Notes, Series B, due February 15, 2027 (“U.S. Senior Notes, Series B due 2027”)

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(together, the “U.S. Senior Notes due 2022 and 2027”) were funded. Interest on the U.S. Senior Notes due 2022 and 2027 is payable semiannually on February 15 and August 15, commencing August 15, 2017.

On November 15, 2017, the Company entered into a Note Purchase Agreement pursuant to which the Company issued and sold $175 million in aggregate principal amount of senior notes in two series. On January 16, 2018, $50 million aggregate principal amount of 3.48% Senior Notes, Series A, due February 15, 2025 (“U.S. Senior Notes, Series A due 2025”) and $125 million in aggregate principal amount of 3.78% Senior Notes, Series B, due February 15, 2030 (“U.S. Senior Notes, Series B due 2030”) (together the “U.S. Senior Notes due 2025 and 2030” and with the Euro Senior Notes and the U.S. Senior Notes due 2022 and 2027, the “Senior Notes”) were funded. Interest on the U.S. Senior Notes due 2025 and 2030 is payable semiannually on February 15 and August 15, commencing on August 15, 2018.

The Senior Notes have not been registered under the Securities Act, or applicable state securities laws. The Senior Notes are general unsecured senior obligations and rank equal in right of payment with all existing and future unsecured unsubordinated indebtedness of the Company.

The Senior Notes are subject to certain customary covenants, including limitations on the Company’s ability, with certain exceptions, to engage in mergers, consolidations, asset sales and transactions with affiliates, to engage in any business that would substantially change the general business of the Company, and to incur liens. In addition, the Company is required to satisfy certain financial covenants and tests relating to, among other matters, interest coverage and leverage. At June 26, 2021, the Company was in compliance with all covenants under the Senior Notes.

The Company may redeem the Senior Notes upon the satisfaction of certain conditions and the payment of a make-whole amount to noteholders and are required to offer to repurchase the Senior Notes at par following certain events, including a change of control.

Interest paid on all Company debt was $2.5 million and $3.4 million for the three months ended June 26, 2021 and June 27, 2020, respectively, and $8.7 million and $10.8 million for the six months ended June 26, 2021 and June 27, 2020, respectively.

9. Fair Value of Assets and Liabilities

For assets and liabilities measured at fair value on a recurring and nonrecurring basis, a three-level hierarchy of measurements based upon observable and unobservable inputs is used to arrive at fair value. Observable inputs are developed based on market data obtained from independent sources, while unobservable inputs reflect the Company’s assumptions about valuation based on the best information available in the circumstances. Depending on the inputs, the Company classifies each fair value measurement as follows:

Level 1—Valuations based on unadjusted quoted prices for identical assets or liabilities in active markets;

Level 2—Valuations based upon quoted prices for similar instruments, prices for identical or similar instruments in markets that are not active, or model-derived valuations, all of whose significant inputs are observable, and

Level 3—Valuations based upon one or more significant unobservable inputs.

Following is a description of the valuation methodologies used for instruments measured at fair value and their classification in the valuation hierarchy.

Cash Equivalents

Cash equivalents primarily consist of money market funds, which are held with an institution with sound credit rating and are highly liquid. The Company classified cash equivalents as Level 1 and are valued at cost which approximates fair value.

Investments in Equity Securities

Investments in equity securities listed on a national market or exchange are valued at the last sales price and classified within Level 1 of the valuation hierarchy and recorded in investments and other assets.

Other Investments

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The Company has certain convertible debt and convertible preferred stock investments that are accounted for under the cost method reflected in other assets in the Condensed Consolidated Balance Sheets. During the three and six months ended June 26, 2021, the Company impaired the remaining book value of these investments and recorded an impairment charge of $0.5 million in Other (income) expense, net in the Condensed Consolidated Statements of Net Income (Loss). As of December 26, 2020, the balances of these investments was $0.5 million. The fair value of these investments are measured on a nonrecurring basis using Level 3 inputs under the fair value hierarchy.

Mutual Funds

The Company has a non-qualified Supplemental Retirement and Savings Plan which provides additional retirement benefits for certain management employees and named executive officers by allowing participants to defer a portion of their annual compensation. The Company maintains accounts for participants through which participants make investment elections. The marketable securities are classified as Level 1 under the fair value hierarchy as they are maintained in mutual funds with readily determinable fair value and recorded in other assets.

There were no changes during the quarter ended June 26, 2021 to the Company’s valuation techniques used to measure asset and liability fair values on a recurring basis. As of June 26, 2021 and December 26, 2020, the Company did not hold any non-financial assets or liabilities that are required to be measured at fair value on a recurring basis.

The following table presents assets measured at fair value by classification within the fair value hierarchy as of June 26, 2021:

	Fair Value Measurements Using
(in thousands)	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Cash equivalents	$	25,768	$	—	$	—	$	25,768
Investments in equity securities	27,532		—		—		27,532
Mutual funds	14,545		—		—		14,545
Total	$	67,845	$	—	$	—	$	67,845

The following table presents assets measured at fair value by classification within the fair value hierarchy as of December 26, 2020: 

	Fair Value Measurements Using
(in thousands)	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Cash equivalents	$	73,461	$	—	$	—	$	73,461
Investments in equity securities	19,186		—		—		19,186
Mutual funds	13,249		—		—		13,249
Total	$	105,896	$	—	$	—	$	105,896

In addition to the methods and assumptions used for the financial instruments recorded at fair value as discussed above, the following methods and assumptions are used to estimate the fair value of other financial instruments that are not marked to market on a recurring basis. The Company’s other financial instruments include cash and cash equivalents, short-term investments, accounts receivable and its long-term debt. Due to their short-term maturity, the carrying amounts of cash and cash equivalents, short-term investments and accounts receivable approximate their fair values. The Company’s revolving credit facilities’ fair values approximate book value at June 26, 2021 and December 26, 2020, as the rates on these borrowings are variable in nature.

The carrying value and estimated fair values of the Company’s Euro Senior Notes, Series A and Series B and USD Senior Notes, Series A and Series B, as of June 26, 2021 and December 26, 2020 were as follows:

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	June 26, 2021				December 26, 2020
(in thousands)	Carrying Value		Estimated Fair Value		Carrying Value		Estimated Fair Value
Euro Senior Notes, Series A due 2023	$	139,610	$	141,709	$	142,679	$	144,323
Euro Senior Notes, Series B due 2028	113,359		119,481		115,850		123,588
USD Senior Notes, Series A due 2022	25,000		25,284		25,000		25,437
USD Senior Notes, Series B due 2027	100,000		107,293		100,000		109,552
USD Senior Notes, Series A due 2025	50,000		52,845		50,000		53,474
USD Senior Notes, Series B due 2030	125,000		134,145		125,000		138,036

The Company recognized impairment charges of $1.9 million for the land and building and $0.3 million for a certain patent as a result of the Company’s announcement to consolidate a manufacturing facility within the Industrial segment during the first quarter of 2020. See Note 7, Restructuring, Impairment, and Other Charges, for further discussion. The fair value of the land and building was valued using a real estate appraisal and classified as a Level 3 input under the fair value hierarchy.

10. Benefit Plans

The Company has company-sponsored defined benefit pension plans covering employees in the U.K., Germany, the Philippines, China, Japan, Mexico, Italy and France. The amount of the retirement benefits provided under the plans is based on years of service and final average pay.

The Company recognizes interest cost, expected return on plan assets, and amortization of prior service, net within Other (income) expense, net in the Condensed Consolidated Statements of Net Income (Loss). The components of net periodic benefit cost for the three and six months ended June 26, 2021 and June 27, 2020 were as follows: 

	For the Three Months Ended				For the Six Months Ended
(in thousands)	June 26, 2021		June 27, 2020		June 26, 2021		June 27, 2020
Components of net periodic benefit cost:
Service cost	$	700	$	592	$	1,402	$	1,210
Interest cost	443		486		883		1,144
Expected return on plan assets	(371)		(402)		(738)		(1,129)
Amortization of prior service and net actuarial loss	334		264		665		409
Net periodic benefit cost	$	1,106	$	940	$	2,212	$	1,634

The Company expects to make approximately $2.2 million of contributions to the plans and pay $3.8 million of benefits directly in 2021.

The Company also sponsors certain post-employment plans in foreign countries and other statutory benefit plans. The Company recorded expense of $0.5 million for both the three months ended June 26, 2021 and June 27, 2020, respectively, and $1.0 million expense for both the six months ended June 26, 2021 and June 27, 2020, respectively, in Cost of Sales and Other (income) expense, net within the Condensed Consolidated Statements of Net Income (Loss). For the three and six months ended June 26, 2021, the pre-tax amounts recognized in other comprehensive income (loss) as components of net periodic benefit costs for these plans were $0.2 million and 0.3 million. For three and six months ended June 27, 2020, the pre-tax amounts recognized in other comprehensive income (loss) as components of net periodic benefit costs for these plans were $0.2 million and $0.4 million, respectively.

On April 7, 2020, the Company entered into a definitive agreement to purchase a group annuity contract, under which an insurance company will be required to directly pay and administer pension payments to certain of the Company’s U.K. pension plan participants, or their designated beneficiaries. The purchase of this group annuity contract will reduce the Company’s outstanding pension benefit obligation by approximately $55 million, representing approximately 37% of the total obligations

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of the Company’s qualified pension plans, and will be funded with pension plan assets and additional cash on hand. In connection with this transaction, the Company will record a one-time non-cash settlement charge currently estimated between $18 million and $22 million in the fourth quarter of 2021, reflecting the accelerated recognition of unamortized actuarial losses in the plan. The actual amount and timing of the settlement charge could differ from this estimate due to final data and plan wind-up expenses. Due to the signing of the group annuity contract being a significant change in the U.K. pension plan, the liabilities of the plan were remeasured as of April 6, 2020 resulting in an increase of $13.4 million (£10.9 million) to both the net pension liability and unamortized actuarial loss within other comprehensive income (loss) during the second quarter of 2020. Additionally, the Company made a cash contribution of $10.4 million (£8.4 million) under this agreement during the second quarter of 2020.

11. Other Comprehensive Income (Loss)

Changes in other comprehensive income (loss) by component were as follows:

(in thousands)	Three Months Ended June 26, 2021						Three Months Ended June 27, 2020
	Pre-tax		Tax		Net of Tax		Pre-tax		Tax		Net of Tax
Defined benefit pension plan and other adjustments	$	372	$	43	$	329	$	(13,098)	$	(2,259)	$	(10,839)
Foreign currency translation adjustments	5,125		—		5,125		8,422		—		8,422
Total change in other comprehensive income (loss)	$	5,497	$	43	$	5,454	$	(4,676)	$	(2,259)	$	(2,417)
(in thousands)	Six Months Ended June 26, 2021						Six Months Ended June 27, 2020
	Pre-tax		Tax		Net of Tax		Pre-tax		Tax		Net of Tax
Defined benefit pension plan adjustments	$	878	$	95	$	783	(12,543)		(2,265)		$	(10,278)
Foreign currency translation adjustments	(200)		—		(200)		$	(7,118)	$	—	$	(7,118)
Total change in other comprehensive income (loss)	$	678	$	95	$	583	$	(19,661)	$	(2,265)	$	(17,396)

Due to the signing of the group annuity contract being a significant change in the U.K. pension plan, the liabilities of the plan were remeasured as of April 6, 2020 resulting in an increase of $13.4 million to unamortized actuarial loss within other comprehensive income (loss). See Note 10, Benefits Plans for further discussion.

The following tables set forth the changes in accumulated other comprehensive (loss) by component for the six months ended June 26, 2021 and June 27, 2020:

(in thousands)	Defined benefit pension plan and other adjustments		Foreign currency translation adjustment		Accumulated other comprehensive (loss)
Balance at December 26, 2020	$	(34,141)	$	(57,016)	$	(91,157)
Activity in the period	783		(200)		583
Balance at June 26, 2021	$	(33,358)	$	(57,216)	$	(90,574)

(in thousands)	Defined benefit pension plan and other adjustments		Foreign currency translation adjustment		Accumulated other comprehensive (loss)
Balance at December 28, 2019	$	(18,046)	$	(88,777)	$	(106,823)
Activity in the period	(10,278)		(7,118)		(17,396)
Balance at June 27, 2020	$	(28,324)	$	(95,895)	$	(124,219)

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Amounts reclassified from accumulated other comprehensive (loss) to earnings for the three and six months ended June 26, 2021 and June 27, 2020 were as follows:

	Three Months Ended				Six Months Ended
(in thousands)	June 26, 2021		June 27, 2020		June 26, 2021		June 27, 2020
Pension and Postemployment plans:
Amortization of prior service and net actuarial loss	$	509	$	429	$	1,013	$	774

The Company recognizes the amortization of prior service costs in Other (income) expense, net within the Condensed Consolidated Statements of Net Income.

12. Income Taxes

The effective tax rate for the three and six months ended June 26, 2021 was 13.8% and 16.7%, respectively, compared to the effective tax rate for the three and six months ended June 27, 2020 of 15.1% and 37.2%, respectively. The effective tax rate for the second quarter of 2021 (which is based upon pre-tax income) is lower than the effective tax rate for the comparable 2020 period (which is based upon a pre-tax loss), primarily due to an increase in the forecasted income earned in lower tax jurisdictions in 2021 as compared to 2020, as well as the impact of the goodwill impairment charge of $33.8 million recorded in the second quarter of 2020, the substantial majority of which did not result in a tax benefit. The effective tax rate for the first six months of 2021 is lower than the effective tax rate for the comparable 2020 period, primarily due to an increase in the forecasted income earned in lower tax jurisdictions in 2021 as compared to 2020, as well as the impact of the goodwill impairment charge of $33.8 million recorded in the second quarter of 2020. The effective tax rate for the 2021 periods is lower than the applicable U.S. statutory tax rate primarily due to income earned in lower tax jurisdictions.

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13. Earnings (loss) Per Share

The following table sets forth the computation of basic and diluted earnings per share: 

	Three Months Ended				Six Months Ended
(in thousands, except per share amounts)	June 26, 2021		June 27, 2020		June 26, 2021		June 27, 2020
Numerator:
Net income (loss) as reported	$	82,095	$	(8,991)	$	139,808	$	15,653
Denominator:
Weighted average shares outstanding
Basic	24,592		24,312		24,562		24,353
Effect of dilutive securities	308		—		332		167
Diluted	24,900		24,312		24,894		24,520
Earnings (loss) Per Share:
Basic earnings (loss) per share	$	3.34	$	(0.37)	$	5.69	$	0.64
Diluted earnings (loss) per share	$	3.30	$	(0.37)	$	5.62	$	0.64

Potential shares of common stock relating to stock options and restricted share units excluded from the earnings per share calculation because their effect would be anti-dilutive were 41,216 and 328,624 for the three months ended June 26, 2021 and June 27, 2020, respectively, and 20,266 and 212,290 for the six months ended June 26, 2021 and June 27, 2020, respectively.

Share Repurchase Program

On April 26, 2019, the Company's Board of Directors authorized a program to repurchase up to 1,000,000 shares of the Company's common stock for the period May 1, 2019 to April 30, 2020 ("2019 program"). On April 29, 2020, the Company announced that the Board of Directors authorized a new program to repurchase up to 1,000,000 shares of the Company's common stock for the period May 1, 2020 to April 30, 2021 (the "2020 program") to replace its previous expired 2019 program. On April, 28, 2021, the Company announced that the Board of Directors authorized a new three year program to repurchase up to $300.0 million in the aggregate of shares of the Company’s common stock for the period May 1, 2021 to April 30, 2024 to replace its previous 2020 program.

The Company did not repurchase any shares of its common stock for the three and six months ended June 26, 2021. During the six months ended June 27, 2020, the Company repurchased 175,110 shares of its common stock totaling $22.9 million.

14. Related Party Transactions

The Company has equity ownership in various investments that are accounted for under the equity method. The following is a description of the investments and related party transactions.

Powersem GmbH: The Company owns 45% of the outstanding equity of Powersem GmbH (“Powersem”), a module manufacturer based in Germany.

EB-Tech Co., Ltd.: The Company owns approximately 19% of the outstanding equity of EB Tech Co., Ltd. (“EB Tech”), a company with expertise in radiation technology based in South Korea.

Automated Technology (Phil), Inc.: The Company owns approximately 24% of the outstanding common shares of Automated Technology (Phil), Inc. (“ATEC”), a supplier located in the Philippines that provides assembly and test services. One member of the Company's Board of Directors serves on the Board of Directors of ATEC.

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	For the Three Months Ended June 26, 2021						For the Three Months Ended June 27, 2020
(in millions)	Powersem		EB Tech		ATEC		Powersem		EB Tech		ATEC
Sales to related party	$	—	$	—	$	—	$	0.3	$	—	$	—
Purchase material/service from related party	0.7		0.1		2.8		0.8		—		1.6
	For the Six Months Ended June 26, 2021						For the Six Months Ended June 27, 2020
(in millions)	Powersem		EB Tech		ATEC		Powersem		EB Tech		ATEC
Sales to related party	$	0.2	$	—	$	—	$	0.7	$	—	$	—
Purchase material/service from related party	1.8		0.2		5.8		1.0		—		3.4
	June 26, 2021						December 26, 2020
(in millions)	Powersem		EB Tech		ATEC		Powersem		EB Tech		ATEC
Accounts receivable balance	$	—	$	—	$	—	$	0.1	$	—	$	—
Accounts payable balance	0.1		—		1.8		0.1		—		0.2

15. Segment Information

The Company and its subsidiaries design, manufacture and sell components and modules empowering a sustainable, connected, and safer world. The Company reports its operations by the following segments: Electronics, Automotive, and Industrial. An operating segment is defined as a component of an enterprise that engages in business activities from which it may earn revenues and incur expenses, and about which separate financial information is regularly evaluated by the Chief Operating Decision Maker (“CODM”) in deciding how to allocate resources. The CODM is the Company’s President and Chief Executive Officer (“CEO”). The CODM allocates resources to and assesses the performance of each operating segment using information about its revenue and operating income (loss) before interest and taxes, but does not evaluate the operating segments using discrete balance sheet information.

Sales, marketing, and research and development expenses are charged directly into each operating segment. Purchasing, logistics, customer service, finance, information technology, and human resources are shared functions that are allocated back to the three operating segments. The Company does not report inter-segment revenue because the operating segments do not record it. Certain expenses, determined by the CODM to be strategic in nature and not directly related to segments' current results, are not allocated but identified as “Other”. Additionally, the Company does not allocate interest and other income, interest expense, or taxes to operating segments. These costs are not allocated to the segments, as management excludes such costs when assessing the performance of the segments. Although the CODM uses operating income (loss) to evaluate the segments, operating costs included in one segment may benefit other segments. Except as discussed above, the accounting policies for segment reporting are the same as for the Company as a whole.

•Electronics Segment: Consists of one of the broadest product offerings in the industry, including fuses and fuse accessories, positive temperature coefficient (“PTC”) resettable fuses, polymer electrostatic discharge (“ESD”) suppressors, varistors, reed switch based magnetic sensing, gas discharge tubes; semiconductor products such as discrete transient voltage suppressor (“TVS”) diodes, TVS diode arrays, protection and switching thyristors, metal-oxide-semiconductor field effect transistors (“MOSFETs”) and silicon carbide diodes; and insulated gate bipolar transistors (“IGBT”) technologies. The segment covers a broad range of end markets, including industrial motor drives and power conversion, automotive electronics, electric vehicle and related infrastructure, power supplies, data centers and telecommunications, medical devices, alternative energy, building and home automation, appliances, and mobile electronics.

•Automotive Segment: Consists of a wide range of circuit protection, power control and sensing technologies for global original equipment manufacturers (“OEMs”), Tier-I suppliers and parts distributors in passenger car, heavy duty truck, off-road vehicles, material handling, agricultural, construction and other commercial vehicle end markets. Passenger car fuse products for internal combustion engine, hybrid and electric vehicles including blade fuses, battery cable protectors, resettable fuses, high-current fuses, and high-voltage fuses. Commercial vehicle products include fuses, switches, relays, and power distribution modules used in applications serving a number of end markets, including

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heavy truck, construction, agriculture and material handling. Automotive sensor products include a wide range of automotive and commercial vehicle products designed to monitor the passenger compartment occupant's safety and environment as well as the vehicle’s powertrain.

•Industrial Segment: Consists of industrial circuit protection products (i.e. fuses, power distribution modules, switches) and industrial control products (i.e. relays, transformers, contactors, sensors). These products are used in a variety of applications and end-markets including: Renewable Energy, Energy Storage, HVAC, Electric Vehicle Infrastructure, Industrial Equipment, Industrial Automation, Construction, Mining, and Oil & Gas.

Segment information is summarized as follows: 

	Three Months Ended				Six Months Ended
(in thousands)	June 26, 2021		June 27, 2020		June 26, 2021		June 27, 2020
Net sales
Electronics	$	325,347	$	223,271	$	611,882	$	437,460
Automotive	133,318		61,999		261,847		166,769
Industrial	64,823		22,067		113,553		49,204
Total net sales	$	523,488	$	307,337	$	987,282	$	653,433
Depreciation and amortization
Electronics	$	15,114	$	15,617	$	30,495	31,148
Automotive	6,946		7,071		14,019		14,258
Industrial	2,155		1,046		3,899		2,130
Total depreciation and amortization	$	24,215	$	23,734	$	48,413	$	47,536
Operating income (loss)
Electronics	$	74,236	$	32,651	$	129,759	$	64,923
Automotive	19,258		(8,857)		39,574		5,259
Industrial	8,375		(23)		11,881		3,511
Other(a)	(5,612)		(35,721)		(8,476)		(40,893)
Total operating income (loss)	96,257		(11,950)		172,738		32,800
Interest expense	4,626		5,855		9,299		11,273
Foreign exchange (gain) loss	(1,676)		(6,010)		5,161		(3,426)
Other (income) expense, net	(1,890)		(1,210)		(9,627)		39
Income (loss) before income taxes	$	95,197	$	(10,585)	$	167,905	$	24,914

(a) Included in “Other” Operating income for the second quarter of 2021 was $3.3 million ($6.8 million year-to-date) of purchase accounting inventory step-up charges, $0.5 million ($1.3 million year-to-date) of legal and professional fees and other integration expenses related to Hartland and other contemplated acquisitions, and $0.8 million ($1.3 million year-to-date) of restructuring, impairment and other charges, primarily related to employee termination costs. See Note 7, Restructuring, Impairment, and Other Charges, for further discussion. In addition, there was a loss of $1.0 million recorded during the second quarter of 2021 for a total year-to-date gain of $0.9 million from the sale of a building within the Electronics segment.

Included in “Other” Operating (loss) income for the 2020 second quarter is $0.1 million ($1.3 million year-to-date) of acquisition-related and integration charges related to the IXYS acquisition and other contemplated acquisitions. In addition, there was $35.6 million ($39.6 million year-to-date) of restructuring, impairment and other charges, primarily related to the goodwill impairment charge of $33.8 million recorded in the second quarter associated with the automotive sensors reporting unit within the Automotive segment, $1.8 million ($3.5 million year-to-date) of employee termination costs, and other restructuring charges and impairment charges of $2.2 million recorded in the first quarter associated with the announced consolidation of a manufacturing facility within the Industrial segment. See Note 5, Goodwill and Other Intangible Assets and Note 7, Restructuring, Impairment, and Other Charges, for further discussion.

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The Company’s net sales by country were as follows: 

	Three Months Ended				Six Months Ended
(in thousands)	June 26, 2021		June 27, 2020		June 26, 2021		June 27, 2020
Net sales
United States	$	154,797	$	76,870	$	285,728	$	179,780
China	156,086		102,026		295,244		188,041
Other countries(a)	212,605		128,441		406,310		285,612
Total net sales	$	523,488	$	307,337	$	987,282	$	653,433

 The Company’s long-lived assets by country were as follows:

(in thousands)	June 26, 2021		December 26, 2020
Long-lived assets
United States	$	47,509	$	46,132
China	87,497		85,876
Mexico	76,700		70,125
Germany	37,447		37,976
Philippines	69,308		66,994
Other countries(a)	34,365		37,075
Total long-lived assets	$	352,826	$	344,178

The Company’s additions to long-lived assets by country were as follows:

	Six Months Ended
(in thousands)	June 26, 2021		June 27, 2020
Additions to long-lived assets
United States	$	1,732	$	2,026
China	7,127		4,516
Mexico	13,231		4,260
Germany	2,533		2,509
Philippines	6,941		9,039
Other countries(a)	1,793		687
Total additions to long-lived assets	$	33,357	$	23,037

(a)Each country included in other countries is less than 10% of net sales.

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ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS.

Cautionary Statement Regarding Forward-Looking Statements Under the Private Securities Litigation Reform Act of 1995 (“PSLRA”).

Certain statements in this section and other parts of this Quarterly Report on Form 10-Q may constitute "forward-looking statements" within the meaning of the federal securities laws and are entitled to the safe-harbor provisions of the PSLRA. These statements include statements regarding the Company’s future performance, as well as management's expectations, beliefs, intentions, plans, estimates or projections relating to the future. Such statements can be identified by the use of forward-looking terminology such as "believes," "expects," "may," "estimates," "will," "should," "plans" or "anticipates" or the negative thereof or other variations thereon or comparable terminology, or by discussions of strategy, although not all forward-looking statements contain such terms. The Company cautions that forward-looking statements, which speak only as of the date they are made, are subject to risks, uncertainties and other factors, and actual results and outcomes may differ materially from those indicated or implied by the forward-looking statements. These risks, uncertainties and other factors include, but are not limited to, risks and uncertainties relating to general economic conditions; the severity and duration of the coronavirus disease 2019 ("COVID-19") pandemic and the measures taken in response thereto and the effects of those items on the Company’s business; product demand and market acceptance; economic conditions; the impact of competitive products and pricing; product quality problems or product recalls; capacity and supply difficulties or constraints; coal mining exposures reserves; failure of an indemnification for environmental liability; exchange rate fluctuations; commodity price fluctuations; the effect of the Company's accounting policies; labor disputes; restructuring costs in excess of expectations; pension plan asset returns less than assumed; uncertainties related to political or regulatory changes; integration of acquisitions may not be achieved in a timely manner, or at all; and other risks that may be detailed in Item 1A. "Risk Factors" of the Company's Annual Report on Form 10-K for the year ended December 26, 2020, and the Company's other filings and submissions with the Securities and Exchange Commission. The Company does not undertake any obligation to update or revise any forward-looking statements to reflect future events or circumstances, new information or otherwise.

This report, including the Management’s Discussion and Analysis of Financial Condition and Results of Operations, should be read in conjunction with information provided in the consolidated financial statements and the related Notes thereto appearing in the Company's Annual Report on Form 10-K for the year ended December 26, 2020. 

Management’s Discussion and Analysis of Financial Condition and Results of Operations ("MD&A") is designed to provide information that is supplemental to, and should be read together with, the consolidated financial statements and the accompanying notes. Information in MD&A is intended to assist the reader in obtaining an understanding of (i) the consolidated financial statements, (ii) the changes in certain key items within those financial statements from year-to-year, (iii) the primary factors that contributed to those changes, and (iv) any changes in known trends or uncertainties that we are aware of and that may have a material effect on future performance. In addition, MD&A provides information about the Company’s segments and how the results of those segments impact the results of operations and financial condition as a whole.

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Executive Overview

Founded in 1927, Littelfuse is an industrial technology manufacturing company empowering a sustainable, connected, and safer world. Across more than 15 countries, and with 12,000 global associates, we partner with customers to design and deliver innovative, reliable solutions. Serving over 100,000 end customers, our products are found in a variety of industrial, transportation and electronics end markets – everywhere, every day.

The Company maintains a network of global laboratories and engineering centers that develop new products and product enhancements, provide customer application support and test products for safety, reliability, and regulatory compliance. The Company conducts its business through three reportable segments: Electronics, Automotive, and Industrial. Within these segments, the Company designs, manufactures and sells components and modules empowering a sustainable, connected, and safer world. Our products protect against electrostatic discharge, power surges, short circuits, voltage spikes and other harmful occurrences, safely and efficiently control power and improve productivity and are used to identify and detect temperature, proximity, flow speed and fluid level in various applications.

Executive Summary

For the second quarter of 2021, the Company recognized net sales of $523.5 million compared to $307.3 million in the second quarter of 2020 representing an increase of $216.2 million, or 70.3%. The increase was primarily driven by higher volumes across all businesses in each of the segments, $26.4 million or 5.0% of net sales from the Hartland acquisition within the Industrial segment and $13.5 million or 4.4% of favorable changes in foreign exchange rates. The Company recognized net income of $82.1 million, or $3.30 per diluted share, in the second quarter of 2021 compared to a net loss of $9.0 million, or $0.37 per diluted share in the second quarter of 2020. The increase in net income reflects higher operating income of $108.2 million driven by a $41.6 million and a $28.1 million increase in operating income in the Electronics and Automotive segments, respectively, and the second quarter of 2020 included a non-cash goodwill impairment charge of $33.8 million related to the automotive sensors reporting unit within the Automotive segment.

On January 28, 2021, the Company acquired Hartland Controls ("Hartland"), a manufacturer and leading supplier of electrical components used primarily in heating, ventilation, air conditioning (HVAC) and other industrial and control systems applications with annualized sales of approximately $70 million. The purchase price for Hartland was approximately $112.3 million and the operations of Hartland are included in the Industrial segment.

Net cash provided by operating activities was $126.3 million for the six months ended June 26, 2021 as compared to $101.3 million for the six months ended June 27, 2020. The increase in net cash provided by operating activities was primarily due to higher cash earnings partially offset by increases in working capital resulting from higher sales growth.

Impact of COVID-19 on Business

The effects from COVID-19 continue to drive increased costs, though lower than 2020 levels. Ongoing costs include spending on personal protective equipment ("PPE"), additional personnel and employee transportation costs, and manufacturing inefficiencies, as well as an increase in freight costs and raw material due to the transportation capacity constraints across the world.

The Company anticipates that the global health crisis caused by COVID-19 may continue to impact its business activity for the foreseeable future. It is currently difficult to estimate the magnitude of the COVID-19 disruption, if future disruptions will occur due to a resurgence in COVID-19 cases and its impact on our employees, customers, suppliers and vendors. The Company will continue to actively monitor the situation and may take further actions altering our business operations that we determine are in the best interests of our employees, customers, partners, suppliers, and other stakeholders, or as required by federal, state, or local authorities. It is not clear what the potential effects any such alterations or modifications may have on our business and operations, including the effects on our customers, employees, and prospects, or on our financial results for the fiscal year 2021.

Results of Operations

The following table summarizes the Company’s unaudited condensed consolidated results of operations for the periods presented. The second quarter of 2021 includes $3.3 million ($6.8 million year-to-date) of purchase accounting inventory step-

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up charges, $0.5 million ($1.3 million year-to-date) of legal and professional fees and other integration expenses related to Hartland and other contemplated acquisitions and $0.8 million ($1.3 million year-to-date) of restructuring, impairment and other charges, primarily related to employee termination costs. In addition, there was a loss of $1.0 million recorded during the second quarter of 2021 for a total year-to-date gain of $0.9 million from the sale of a building within the Electronics segment

The second quarter of 2020 includes $0.1 million ($1.3 million year-to-date) of acquisition-related and integration charges related to the IXYS acquisition and other contemplated acquisitions. In addition, there was $35.6 million ($39.6 million year-to-date) of restructuring, impairment and other charges, primarily related to the goodwill impairment charge of $33.8 million recorded in the second quarter associated with the automotive sensors reporting unit within the Automotive segment, $1.8 million ($3.5 million year-to-date) of employee termination costs, and other restructuring charges and impairment charges of $2.2 million recorded in the first quarter associated with the announced consolidation of a manufacturing facility within the Industrial segment.

	Second Quarter								First Six Months
(in thousands)	2021		2020		Change		% Change		2021		2020		Change		% Change
Net sales	$	523,488	$	307,337	$	216,151	70.3	%	$	987,282	$	653,433	$	333,849	51.1	%
Cost of sales	326,092		207,435		118,657		57.2	%	629,420		429,175		200,245		46.7	%
Gross profit	197,396		99,902		97,494		97.6	%	357,862		224,258		133,604		59.6	%
Operating expenses	101,139		111,852		(10,713)		(9.6)	%	185,124		191,458		(6,334)		(3.3)	%
Operating income (loss)	96,257		(11,950)		108,207		905.5	%	172,738		32,800		139,938		426.6	%
Income (loss) before income taxes	95,197		(10,585)		105,782		999.4	%	167,905		24,914		142,991		573.9	%
Income taxes	13,102		(1,594)		14,696		922.0	%	28,097		9,261		18,836		203.4	%
Net income (loss)	$	82,095	$	(8,991)	$	91,086	1,013.1	%	$	139,808	$	15,653	$	124,155	793.2	%

Net Sales

Net sales increased $216.2 million or 70.3% including $13.5 million or 4.4% of favorable changes in foreign exchange rates for the second quarter of 2021 compared to the second quarter of 2020. The increase was driven by volume growth across each of our segments and businesses within these segments whereas the second quarter of 2020 had temporary closures of manufacturing facilities resulting from government directives due to the impact of COVID-19. The sales growth was primarily across all businesses within the Electronics and Automotive segments, which had sales increases of $102.1 million and $71.3 million, respectively. The volume increase within the Electronics segment was led by broad-based demand across electronics, transportation and industrial end markets. The volume increase within the Automotive segment was led by growth in global auto and commercial vehicle market demand along with greater content growth across passenger vehicles due to vehicle mix, including growth in electric vehicles. The remaining increase in net sales was primarily due to $26.4 million of net sales resulting from the Hartland acquisition included in the Industrial segment and volume growth across all businesses within the Industrial segment.

Net sales increased $333.8 million or 51.1% including $25.9 million or 4.0% of favorable changes in foreign exchange rates for the first six months of 2021 compared to the first six months of 2020. The increase was due to volume growth across all segments and businesses while the first six months of 2020 had temporary closures of manufacturing facilities resulting from government directives due to the impact of COVID-19. The increase was primarily due to higher sales of $174.4 million and $95.1 million in the Electronics and Automotive segments, respectively, driven by higher volumes across all businesses within these segments. The volume increase within the Electronics segment was led by broad-based demand across electronics, transportation and industrial end markets. The volume increase within the Automotive segment was led by growth in global auto and commercial vehicle market demand along with greater content growth across passenger vehicles due to vehicle mix, including growth in electric vehicles. The remaining increase in net sales was primarily due to $43.1 million of net sales resulting from the Hartland acquisition included in the Industrial segment and volume growth across all businesses within the Industrial segment.

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Cost of Sales

Cost of sales was $326.1 million, or 62.3% of net sales, in 2021, compared to $207.4 million, or 67.5% of net sales, in 2020. The increase in cost of sales was primarily due to greater volume across all segments driven by the factors discussed above along with the acquisition of Hartland. As a percent of net sales, cost of sales decreased 5.2% driven by volume leverage, partially offset by higher freight costs of 1.2%, the Hartland purchase accounting inventory charges of $3.3 million or 0.6%, and higher commodity costs.

Cost of sales was $629.4 million, or 63.8% of net sales for the first six months of 2021, compared to $429.2 million, or 65.7% of net sales for the first six months of 2020. The increase in cost of sales was primarily due to greater volume across all segments driven by the factors discussed above along with the acquisition of Hartland. As a percent of net sales, cost of sales decreased 1.9% driven by volume leverage, partially offset by higher freight costs of 1.1%, the Hartland purchase accounting inventory charges of $6.8 million or 0.7%, and higher commodity costs.

Gross Profit

Gross profit was $197.4 million, or 37.7% of net sales, in the second quarter of 2021 compared to $99.9 million, or 32.5% of net sales, for the second quarter of 2020. The $97.5 million increase in gross profit was primarily due to higher volume across all segments while the second quarter of 2020 had additional costs associated with the temporary closures of manufacturing facilities resulting from government directives due to the impact of COVID-19. The increase in gross margin of 5.2% was primarily driven by volume leverage, partially offset by higher freight costs as a percent of net sales of 1.2%, the purchase accounting inventory charges of $3.3 million or 0.6%, and higher commodity costs.

Gross profit was $357.9 million, or 36.2% of net sales, in the first six months of 2021 compared to $224.3 million, or 34.3% of net sales, for the first six months of 2020. The $133.6 million increase in gross profit was primarily due to higher volume across all segments while the first six months of 2020 had additional costs associated with government-directed plant shutdowns and supply chain constraints. The increase in gross margin of 1.9% was primarily driven by volume leverage, partially offset by the higher freight costs as a percent of net sales of 1.1%, the purchase accounting inventory charges of $6.8 million or 0.7%, and higher commodity costs.

Operating Expenses

Total operating expenses were $101.1 million, or 19.3% of net sales, for the second quarter of 2021 compared to $111.9 million, or 36.4% of net sales, for the second quarter of 2020. The decrease in operating expenses of $10.7 million was primarily due to the goodwill impairment charge of $33.8 million, or 11.0% of net sales, in the automotive sensors reporting unit within the Automotive segment recorded during the second quarter of 2020, partially offset by higher selling, general and administrative expenses of $20.1 million largely due to higher accrued incentive compensation and the Hartland acquisition, and higher research and development expenses of $3.2 million.

Total operating expenses were $185.1 million, or 18.8% of net sales, for the first six months of 2021 compared to $191.5 million, or 29.3% of net sales, for the first six months of 2020. The decrease in operating expenses of $6.3 million is primarily due to the 2020 goodwill impairment charge of $33.8 million, or 5.2% of net sales, in the automotive sensors reporting unit within the Automotive segment and impairment charges of $2.2 million related to the Company’s 2020 first quarter announcement to consolidate a manufacturing facility within the Industrial segment, partially offset by higher selling, general, and administrative expenses of $27.2 million largely due to higher accrued incentive compensation and the Hartland acquisition, and higher research and development expenses of $3.5 million.

Operating Income (Loss)

Operating income was $96.3 million, an increase of $108.2 million for the second quarter of 2021 compared to an operating loss of $12.0 million for the second quarter of 2020. The increase in operating income was primarily due to higher gross profit from all segments as noted above and the second quarter of 2020 goodwill impairment charge of $33.8 million. Operating margins increased from (3.9)% in the second quarter of 2020 to 18.4% in the second quarter of 2021 driven by the factors mentioned above. The goodwill impairment charge of $33.8 million negatively impacted operating margin by 11.0% in the second quarter of 2020.

Operating income was $172.7 million, an increase of $139.9 million, or 426.6%, for the first six months of 2021 compared to $32.8 million for the first six months of 2020. The increase in operating income was primarily due to higher gross margin across all segments and lower operating expenses noted above. Operating margins increased from 5.0% in the first six months

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of 2020 to 17.5% in the first six months of 2021 driven by the factors mentioned above. The goodwill impairment charge of $33.8 million negatively impacted the operating margin by 5.2% for the first six months of 2020.

Income (Loss) Before Income Taxes

Income before income taxes was $95.2 million, or 18.2% of net sales, for the second quarter of 2021 compared to a loss before income taxes of $10.6 million, or 3.4% of net sales, for the second quarter of 2020. In addition to the factors impacting comparative results for operating income (loss) discussed above, income before income taxes was primarily impacted by lower foreign exchange gains of $4.3 million and a $0.7 million decreases in unrealized investment gains associated with our equity investments, partially offset by lower interest expense of $1.2 million due to lower outstanding borrowings under the credit facility.

Income before income taxes was $167.9 million, or 17.0% of net sales, for the first six months of 2021 compared to $24.9 million, or 3.8% of net sales, for the first six months of 2020. In addition to the factors impacting comparative results for operating income discussed above, income before income taxes was impacted by a $9.0 million increases in unrealized investment gains associated with our equity investment and lower interest expense of $2.0 million due to lower outstanding borrowings under the credit facility along with a lower effective interest rate, partially offset by the foreign exchange loss of $5.2 million during the six months ended June 26, 2021 compared to foreign exchange gains of $3.4 million during six months ended June 27, 2020.

Income Taxes

Income tax expense for the second quarter of 2021 was $13.1 million, or an effective tax rate of 13.8%, compared to income tax benefit of $1.6 million, or an effective tax rate of 15.1%, for the second quarter of 2020. The effective tax rate for the second quarter of 2021 (which is based upon pre-tax income) is lower than the effective tax rate for the comparable 2020 period (which is based upon a pre-tax loss), primarily due to an increase in the forecasted income earned in lower tax jurisdictions in 2021 as compared to 2020, as well as the impact of the goodwill impairment charge of $33.8 million recorded in the second quarter of 2020, the substantial majority of which did not result in a tax benefit.

Income tax expense for the first six months of 2021 was $28.1 million, or an effective tax rate of 16.7%, compared to income tax expense of $9.3 million, or an effective tax rate of 37.2%, for the first six months of 2020. The effective tax rate for the first six months of 2021 is lower than the effective tax rate for the comparable 2020 period primarily due to an increase in the forecasted income earned in lower tax jurisdictions in 2021 compared to 2020, and the impact of the goodwill impairment charge of $33.8 million recorded in the second quarter of 2020.

The effective tax rate for the 2021 periods is lower than the applicable U.S. statutory tax rate primarily due to income earned in lower tax jurisdictions.

Segment Results of Operations

The Company reports its operations by the following segments: Electronics, Automotive and Industrial. Segment information is described more fully in Note 15, Segment Information, of the Notes to Condensed Consolidated Financial Statements included in this Quarterly Report.

The following table is a summary of the Company’s net sales by segment:

	Second Quarter								First Six Months
(in thousands)	2021		2020		Change		% Change		2021		2020		Change		% Change
Electronics	$	325,347	$	223,271	$	102,076	45.7	%	$	611,882	$	437,460	$	174,422	39.9	%
Automotive	133,318		61,999		71,319		115.0	%	261,847		166,769		95,078		57.0	%
Industrial	64,823		22,067		42,756		193.8	%	113,553		49,204		64,349		130.8	%
Total	$	523,488	$	307,337	$	216,151	70.3	%	$	987,282	$	653,433	$	333,849	51.1	%

Electronics Segment

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Net sales increased $102.1 million, or 45.7%, in the second quarter of 2021 compared to the second quarter of 2020 and included favorable changes in foreign exchange rates of $7.3 million. The sales increase was primarily due to increased volume for the electronics products and semiconductor businesses of $62.4 million and $39.6 million, respectively. The volume increases were led by broad-based demand across electronics, transportation and industrial end markets. The second quarter of 2020 also included production disruptions due to the impact of COVID-19. 

Net sales increased $174.4 million, or 39.9%, in the first six months of 2021 compared to the first six months of 2020 and included favorable changes in foreign exchange rates of $13.8 million. The sales increase was primarily due to increased volume for the electronics products and semiconductor businesses of $110.3 million and $64.2 million, respectively. The volume increases were driven by strong demand across the consumer electronics, automotive and industrial end markets while the first six months of 2020 were negatively impacted by production disruptions due to the impact of COVID-19.

Automotive Segment

Net sales increased $71.3 million, or 115.0%, in the second quarter of 2021 compared to the second quarter of 2020 and included favorable changes in foreign exchange rates of $5.8 million. The sales increase was due to higher volume in passenger car products, commercial vehicle products, and the automotive sensors business of $37.7 million, $20.8 million, and $12.8 million, respectively. The volume increase within the Automotive segment was led by growth in global auto and commercial vehicle market demand along with greater content growth across passenger vehicles due to vehicle mix, including growth in electric vehicle. This growth was across all regions, particularly in North America and Europe where volumes and demand increased from the second quarter of 2020 that was negatively impacted by COVID-19 production disruptions and temporary plant closures.

Net sales increased $95.1 million, or 57.0%, in the first six months of 2021 compared to the first six months of 2020 and included favorable changes in foreign exchange rates of $11.3 million. These sales increases were due to higher volume in passenger car products, commercial vehicle products, and the automotive sensors business of $53.0 million, $25.2 million, and $16.9 million, respectively. These increases were due to stronger global auto and commercial vehicle market demand. Each of our regions experienced growth driven by an increase in global auto market demand as compared to the first six months of 2020, which had production disruptions due to the impact of COVID-19. Sales also grew due to the launch of new products and higher content per vehicle due to vehicle mix.

Industrial Segment

Net sales increased by $42.8 million, or 193.8%, in the second quarter of 2021 compared to the second quarter of 2020, which included favorable changes in foreign exchange rates of $0.4 million. The increase in net sales was primarily due to incremental net sales of $26.4 million or 119.6% from the Hartland acquisition, higher volume of $10.6 million in the industrial circuit protection (power fuse) business led by growth across renewable energy and data center markets, and the transfer of the temperature sensor product line totaling $2.8 million which was previously reported in the Electronics segment. Additionally, the second quarter of 2020 was negatively impacted by temporary plant shutdowns and production disruptions due to the impact of COVID-19.

Net sales increased by $64.3 million, or 130.8%, in the first six months of 2021 compared to the first six months of 2020, which included favorable changes in foreign exchange rates of $0.8 million. The increase in net sales was primarily due to incremental net sales of $43.1 million or 87.5% from the Hartland acquisition, higher volume of $15.1 million in the industrial circuit protection (power fuse) business, and the transfer of the temperature sensor product line totaling $4.7 million which was previously reported in the Electronics segment. Additionally, the first six months of 2020 was negatively impacted by production disruptions and temporary plant shutdown due to the impact of COVID-19. 

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Geographic Net Sales Information

Net sales by geography represent net sales to customer or distributor locations. The following table is a summary of the Company’s net sales by geography:

	Second Quarter								First Six Months
(in thousands)	2021		2020		Change		% Change		2021		2020		Change		% Change
Asia-Pacific	$	239,477	$	155,737	$	83,740	53.8	%	$	451,662	$	296,610	$	155,052	52.3	%
Americas	180,335		89,651		90,684		101.2	%	333,241		210,152		123,089		58.6	%
Europe	103,676		61,949		41,727		67.4	%	202,379		146,671		55,708		38.0	%
Total	$	523,488	$	307,337	$	216,151	70.3	%	$	987,282	$	653,433	$	333,849	51.1	%

Asia-Pacific 

Net sales increased $83.7 million, or 53.8%, in the second quarter of 2021 compared to the second quarter of 2020 and included favorable changes in foreign exchange rates of $4.8 million. The increase in net sales was primarily due to higher volume across all businesses within the Electronics segment and higher volume in the passenger car products and commercial vehicle businesses within the Automotive segment compared to the second quarter of 2020 that had production disruptions due to the impact of COVID-19.

Net sales increased $155.1 million, or 52.3%, in the first six months of 2021 compared to the first six months of 2020 and included favorable changes in foreign exchange rates of $9.0 million. The increase in net sales was primarily due to higher volume across all businesses across all segments compared to the first six months of 2020 that had production disruptions due to the impact of COVID-19.

Americas

Net sales increased $90.7 million, or 101.2%, in the second quarter of 2021 compared to the second quarter of 2020 and included favorable changes in foreign exchange rates of $0.4 million. The increase in net sales was primarily due to higher volume across all businesses within the Automotive and Electronics segments, incremental sales of $26.4 million from the Hartland acquisition and higher volume in the industrial circuit protection (power fuse) business included in the Industrial segment compared to the second quarter of 2020 that had production disruptions due to the impact of COVID-19.

Net sales increased $123.1 million, or 58.6%, in the first six months of 2021 compared to first six months of 2020 and included favorable changes in foreign exchange rates of $0.5 million. The increase in net sales was primarily due to incremental sales of $43.1 million from the Hartland acquisition, higher volume across all businesses within the Electronics and Automotive segments, and higher volume in the industrial circuit protection (power fuse) business included in the Industrial segment compared to the first six months of 2020 that had production disruptions due to the impact of COVID-19.

Europe 

Net sales increased $41.7 million, or 67.4%, in the second quarter of 2021 compared to the second quarter of 2020 and included favorable changes in foreign exchange rates of $8.3 million. The increase in net sales was primarily due to increased volume across all businesses within the Automotive and Electronics segments compared to the second quarter of 2020 that had production disruptions due to the impact of COVID-19.

Net sales increased $55.7 million, or 38.0%, in the first six months of 2021 compared to the first six months of 2020 and included favorable changes in foreign exchange rates of $16.4 million. The increase in net sales was primarily due to increased volume across all businesses within the Automotive and Electronics segments compared to the first six months of 2020 that had production disruptions due to the impact of COVID-19.

Liquidity and Capital Resources 

The Company has historically supported its liquidity needs through cash flows from operations. Management expects that the Company’s (i) current level of cash, cash equivalents, and marketable securities, (ii) current and forecasted cash flows from operations, (iii) availability under existing funding arrangements, and (iv) access to capital in the capital markets will provide

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sufficient funds to support the Company’s operations, capital expenditures, investments, and debt obligations on both a short-term and long-term basis.

Cash and cash equivalents were $616.3 million as of June 26, 2021, a decrease of $71.2 million as compared to December 26, 2020. As of June 26, 2021, $323.7 million of the Company's $616.3 million cash and cash equivalents was held by U.S. subsidiaries.

Revolving Credit Facility

On April 3, 2020, the Company amended its Credit Agreement to effect certain changes, including, among others: (i) eliminating the $200.0 million unsecured term loan credit facility, the remaining outstanding balance ($140.0 million) of which was repaid in full on April 3, 2020 through the revolving credit facility; (ii) making certain financial and non-financial covenants less restrictive on the Company; (iii) modifying performance-based interest rate margins and undrawn fees; and (iv) extending the maturity date to April 3, 2025. The amended Credit Agreement also allows the Company to increase the size of the revolving credit facility or enter into one or more tranches of term loans if there is no event of default and the Company is in compliance with certain financial covenants. The Company made payments of $30.0 million on the amended revolving credit facility during the six months ended June 26, 2021. The balance under the facility was $100.0 million as of June 26, 2021.

Outstanding borrowings under the amended Credit Agreement bears interest, at the Company’s option, at either LIBOR, fixed for interest periods of one, two, three or six-month periods, plus 1.25% to 2.00%, or at the bank’s Base Rate, as defined, plus 0.25% to 1.00%, based upon the Company’s Consolidated Leverage Ratio, as defined. The Company was also required to pay commitment fees on unused portions of the credit agreement ranging from 0.125% to 0.20%, based on the Consolidated Leverage Ratio, as defined in the agreement. The amended Credit Agreement included representations, covenants and events of default that are customary for financing transactions of this nature. The effective interest rate on outstanding borrowings under the credit facility was 1.59% at June 26, 2021.

As of June 26, 2021, the Company had no amount outstanding in letters of credit and had available $600.0 million of borrowing capacity under the Revolving Credit Facility. At June 26, 2021, the Company was in compliance with all covenants under the Credit Agreement.

Senior Notes

On December 8, 2016, the Company entered into a Note Purchase Agreement, pursuant to which the Company issued and sold €212 million aggregate principal amount of senior notes in two series. The funding date for the Euro denominated senior notes occurred on December 8, 2016 for €117 million in aggregate amount of 1.14% Senior Notes, Series A, due December 8, 2023 (“Euro Senior Notes, Series A due 2023”), and €95 million in aggregate amount of 1.83% Senior Notes, Series B due December 8, 2028 (“Euro Senior Notes, Series B due 2028”) (together, the “Euro Senior Notes”). Interest on the Euro Senior Notes is payable semiannually on June 8 and December 8, commencing June 8, 2017.

On December 8, 2016, the Company entered into a Note Purchase Agreement, pursuant to which the Company issued and sold $125 million aggregate principal amount of senior notes in two series. On February 15, 2017, $25 million in aggregate principal amount of 3.03% Senior Notes, Series A, due February 15, 2022 (“U.S. Senior Notes, Series A due 2022”), and $100 million in aggregate principal amount of 3.74% Senior Notes, Series B, due February 15, 2027 (“U.S. Senior Notes, Series B due 2027”) (together, the “U.S. Senior Notes due 2022 and 2027”) were funded. Interest on the U.S. Senior Notes due 2022 and 2027 is payable semiannually on February 15 and August 15, commencing August 15, 2017.

On November 15, 2017, the Company entered into a Note Purchase Agreement pursuant to which the Company issued and sold $175 million in aggregate principal amount of senior notes in two series. On January 16, 2018, $50 million aggregate principal amount of 3.48% Senior Notes, Series A, due February 15, 2025 (“U.S. Senior Notes, Series A due 2025”) and $125 million in aggregate principal amount of 3.78% Senior Notes, Series B, due February 15, 2030 (“U.S. Senior Notes, Series B due 2030”) (together the “U.S. Senior Notes due 2025 and 2030” and with the Euro Senior Notes and the U.S. Senior Notes due 2022 and 2027, the “Senior Notes”) were funded. Interest on the U.S. Senior Notes due 2025 and 2030 is payable semiannually on February 15 and August 15, commencing on August 15, 2018. Further information regarding the Company’s Senior Notes is provided in Note 8, Debt, of the Notes to the Condensed Consolidated Financial Statements included in this Quarterly Report.

Debt Covenants

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The Company was in compliance with all covenants under the Credit Agreement and Senior Notes as of June 26, 2021 and currently expects to remain in compliance based on management’s estimates of operating and financial results for 2021. As of June 26, 2021, the Company met all the conditions required to borrow under the Credit Agreement and management expects the Company to continue to meet the applicable borrowing conditions.

Acquisitions

On January 28, 2021, the Company acquired Hartland Controls ("Hartland"), a manufacturer and leading supplier of electrical components used primarily in heating, ventilation, air conditioning (HVAC) and other industrial and control systems applications with annualized sales of approximately $70 million. The purchase price for Hartland was approximately $112.3 million and the operations of Hartland Controls are included in the Industrial segment. The net cash payment of $109.9 million for this acquisition was funded by the Company's cash on hand.

Dividends

During the second quarter of 2021 the Company paid quarterly dividends of $11.8 million to the shareholders. On July 21, 2021, the Board of Directors of the Company approved a 10% increase in the quarterly cash dividend from $0.48 to $0.53 per share, payable on September 2, 2021 to stockholders of record as of August 19, 2021.

U.K. pension plan

On April 7, 2020, the Company entered into a definitive agreement to purchase a group annuity contract, under which an insurance company will be required to directly pay and administer pension payments to certain of the Company’s U.K. pension plan participants, or their designated beneficiaries. The purchase of this group annuity contract will reduce the Company’s outstanding pension benefit obligation by approximately $55 million, representing approximately 37% of the total obligations of the Company’s qualified pension plans, and will be funded with pension plan assets and additional cash on hand. In connection with this transaction, the Company will record a one-time non-cash settlement charge currently estimated between $18 million and $22 million in the fourth quarter of 2021, reflecting the accelerated recognition of unamortized actuarial losses in the plan. The actual amount and timing of the settlement charge could differ from this estimate due to final data and plan wind-up expenses. Due to the signing of the group annuity contract being a significant change in the U.K. pension plan, the liabilities of the plan were remeasured as of April 6, 2020 resulting in an increase of $13.4 million (£10.9 million) to both the net pension liability and unamortized actuarial loss within other comprehensive income (loss) during the second quarter of 2020. Additionally, the Company made a cash contribution of $10.4 million (£8.4 million) under this agreement during the second quarter of 2020.

Cash Flow Overview

	First Six Months
(in thousands)	2021		2020
Net cash provided by operating activities	$	126,346	$	101,286
Net cash used in investing activities	(139,940)		(29,390)
Net cash (used in) provided by financing activities	(49,183)		50,526
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	(2,894)		(1,694)
(Decrease) increase in cash, cash equivalents, and restricted cash	(65,671)		120,728
Cash, cash equivalents, and restricted cash at beginning of period	687,525		531,139
Cash, cash equivalents, and restricted cash at end of period	$	621,854	$	651,867

Cash Flow from Operating Activities

Operating cash inflows are largely attributable to sales of the Company’s products. Operating cash outflows are largely attributable to recurring expenditures for raw materials, labor, rent, interest, taxes and other operating activities.

Net cash provided by operating activities was $126.3 million for the six months ended June 26, 2021 as compared to $101.3 million for the six months ended June 27, 2020. The increase in net cash provided by operating activities was primarily due to higher cash earnings partially offset by increases in working capital resulting from higher sales growth. 

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Cash Flow from Investing Activities

Net cash used in investing activities was $139.9 million for the six months ended June 26, 2021 compared to $29.4 million during the six months ended June 27, 2020. Net cash paid for the Hartland acquisition was $109.9 million for the six months ended June 26, 2021. Capital expenditures were $32.7 million, representing an increase of $3.2 million compared to 2020. During the six months ended June 26, 2021, the Company received proceeds of $2.6 million from the sale of a property within the Electronics segment.

Cash Flow from Financing Activities

Net cash used in financing activities was $49.2 million for the six months ended June 26, 2021 compared to net cash provided by financing activities of $50.5 million for the six months ended June 27, 2020. The Company made payments of $30.0 million on the amended revolving credit facility during the six months ended June 26, 2021. On April 3, 2020, the Company amended the Credit Agreement to eliminate the $200.0 million unsecured term loan credit facility, with the remaining outstanding balance of $140.0 million repaid in full on April 3, 2020 through a new borrowing of $140.0 million under the amended revolving credit facility. During the six months ended June 27, 2020, the Company borrowed $100.0 million from its revolving credit facility to preserve financial flexibility and enhance liquidity, given the increasing levels of uncertainty related to COVID-19. The Company also made principal payments of $5.0 million on the term loan during the six months ended June 27, 2020. For the six months ended June 27, 2020, the Company repurchased 175,110 shares of its common stock totaling $22.9 million. Additionally, the Company paid dividends $23.6 million and $23.4 million in the six months ended June 26, 2021 and June 27, 2020, respectively.

Share Repurchase Program

On April 26, 2019, the Company's Board of Directors authorized a program to repurchase up to 1,000,000 shares of the Company's common stock for the period May 1, 2019 to April 30, 2020 ("2019 program"). On April 29, 2020, the Company announced that the Board of Directors authorized a new program to repurchase up to 1,000,000 shares of the Company's common stock for the period May 1, 2020 to April 30, 2021 (the "2020 program") to replace its previous expired 2019 program. On April, 28, 2021, the Company announced that the Board of Directors authorized a new three year program to repurchase up to $300.0 million in the aggregate of shares of the Company’s common stock for the period May 1, 2021 to April 30, 2024 to replace its previous 2020 program.

The Company did not repurchase any shares of its common stock for the three and six months ended June 26, 2021. During the six months ended June 27, 2020, the Company repurchased 175,110 shares of its common stock totaling $22.9 million.

Off-Balance Sheet Arrangements

As of June 26, 2021, the Company did not have any off-balance sheet arrangements, as defined under SEC rules. Specifically, the Company was not liable for guarantees of indebtedness owed by third parties, the Company was not directly liable for the debt of any unconsolidated entity and the Company did not have any retained or contingent interest in assets. The Company does not participate in transactions that generate relationships with unconsolidated entities or financial partnerships, such as entities often referred to as structured finance or special purpose entities.

Critical Accounting Policies and Estimates

The Company’s Condensed Consolidated Financial Statements are prepared in accordance with U.S. GAAP. In connection with the preparation of the Condensed Consolidated Financial Statements, the Company uses estimates and makes judgments and assumptions about future events that affect the reported amounts of assets, liabilities, revenue, expenses, and the related disclosures. The assumptions, estimates, and judgments are based on historical experience, current trends, and other factors the Company believes are relevant at the time it prepares the Condensed Consolidated Financial Statements.

The significant accounting policies and critical accounting estimates are consistent with those discussed in Note 1, Summary of Significant Accounting Policies and Other Information, to the consolidated financial statements and the MD&A section of the Company’s Annual Report on Form 10-K for the year ended December 26, 2020. During the six months ended June 26, 2021, there were no significant changes in the application of critical accounting policies.

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ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK.

See Item 7A, Quantitative and Qualitative Disclosures about Market Risk, of our Annual Report on Form 10-K for the year ended December 26, 2020. During the six months ended June 26, 2021, there have been no material changes in our exposure to market risk.

ITEM 4. CONTROLS AND PROCEDURES 

(a) Evaluation of Disclosure Controls and Procedures

Disclosure controls and procedures (as defined in Rules 13a-15(b) and 15d-15(e) under the Exchange Act) are designed to ensure that information required to be disclosed in reports filed or submitted under the Exchange Act is recorded, processed, summarized, and reported within the time periods specified in the SEC rules and forms, and that such information is accumulated and communicated to management, including our Chief Executive Officer and Chief Financial Officer, to allow timely decisions regarding required disclosures.

In connection with the preparation of this report, management, under the supervision and with the participation of the Chief Executive Officer and Chief Financial Officer, conducted an evaluation of the effectiveness of the design and operation of our disclosure controls and procedures as of June 26, 2021. Based on that evaluation, our Chief Executive Officer and Chief Financial Officer have concluded that, as of the quarter ended June 26, 2021, our disclosure controls and procedures were effective.

(b) Changes in Internal Control over Financial Reporting

There were no changes in our internal control over financial reporting identified in connection with the evaluation required by Rules 13a-15(f) and 15d-15(f) under the Exchange Act that occurred during the quarter ended June 26, 2021 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

PART II – OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS 

None.

ITEM 1A. RISK FACTORS 

There have been no material changes in our risk factors from those disclosed in our Annual Report on Form 10-K for our year ended December 26, 2020.

ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS 

Recent Sales of Unregistered Securities

None.

Purchases of Equity Securities

On April 26, 2019, the Company's Board of Directors authorized a program to repurchase up to 1,000,000 shares of the Company's common stock for the period May 1, 2019 to April 30, 2020 ("2019 program"). On April 29, 2020, the Company announced that the Board of Directors authorized a new program to repurchase up to 1,000,000 shares of the Company's common stock for the period May 1, 2020 to April 30, 2021 (the "2020 program") to replace its previous expired 2019 program. On April, 28, 2021, the Company announced that the Board of Directors authorized a new three year program to repurchase up to $300.0 million in the aggregate of shares of the Company’s common stock for the period May 1, 2021 to April 30, 2024 to replace its previous 2020 program.

The Company did not repurchase any shares of its common stock for the three months ended June 26, 2021 and June 27, 2020.

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ITEM 3. DEFAULTS UPON SENIOR SECURITIES 

None.

ITEM 4. MINE SAFETY DISCLOSURES 

None.

ITEM 5. OTHER INFORMATION 

None.

ITEM 6. EXHIBITS

Exhibit	Description
10.1*	Employment offer letter between Littelfuse, Inc. and Maggie Chu, dated April 28, 2021 ++
31.1*	Certification of David W. Heinzmann, Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2*	Certification of Meenal A. Sethna, Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.1**	Certification Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101	The following financial information from LITTELFUSE, Inc.'s Quarterly Report on Form 10-Q for the quarter ended June 26, 2021 formatted in Inline XBRL (Extensible Business Reporting Language) includes: (i) the Condensed Consolidated Balance Sheets, (ii) the Condensed Consolidated Statements of Net Income (Loss), (iii) the Condensed Consolidated Statements of Comprehensive Income (Loss), (iv) the Consolidated Statements of Stockholders' Equity , (v) the Condensed Consolidated Statements of Cash Flows, and (vi) Notes to the Condensed Consolidated Financial Statements.
104	The cover page from this Quarterly Report on Form 10-Q for the quarter ended June 26, 2021, formatted in Inline XBRL.
*	Filed herewith.
**	Furnished herewith.
++	Management contract or compensatory plan or arrangement.

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this Quarterly Report on Form 10-Q for the quarter ended June 26, 2021, to be signed on its behalf by the undersigned thereunto duly authorized.

	Littelfuse, Inc.
	By:	/s/ Meenal A. Sethna
		Meenal A. Sethna
	Executive Vice President and Chief Financial Officer
Date: July 28, 2021	By:	/s/ Jeffrey G. Gorski
		Jeffrey G. Gorski
	Vice President and Chief Accounting Officer

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EX-10.1

April 27, 2021

Dear Maggie,

It was pleasure talking to you. The following is a summary of the key provisions of our offer of employment. We will provide you with more detailed documents in due course, but I wanted to make sure you have the outline of our offer in writing.

Position: Senior Vice President and Chief Human Resources Officer

Start Date: As soon as practical, but in no event later than June 1, 2021.

Base Compensation: Your annual base salary is $325,000 paid on a semi-monthly basis less appropriate deductions and withholdings.

Annual Incentive Plan: You will be eligible to participate in our Annual Incentive Plan for 2021. Your targeted incentive will be 60% of your annual salary and will be pro-rated to reflect the actual number of full months you have worked.

Long-Term Incentive Program: You will participate in our Long Term Incentive (LTI) Plan. We will recommend your being eligible for an award during our regular 2022 LTI grant process, subject to approval by our Board of Directors, of an LTI award that has an equity value of 100% of your base salary.

Sign-on bonus:

•Cash sign-on bonus in the amount of $110,000. This cash sign-on bonus is contingent upon successfully completing 30 days of employment and is subject to applicable tax withholding. The bonus will be paid out in the pay cycle following your 30 days of employment. To receive this sign-on bonus, you must accept the Sign-on Bonus Repayment Agreement.

•Equity sign-on bonus of $825,000 that will be split between options and RSUs. The options will have an approximate equivalent value of $162,500, will vest pro rata over three years, and will have a strike price that will be equal to the closing price of Littelfuse stock on the date of issuance. The grant of Restricted Stock Units (RSUs) which will have an approximate equivalent value of $662,500 based on the closing price of Littelfuse common stock on the date of your hire. The RSUs will vest in three annual installments beginning one year from the date of grant.

Financial Planning Assistance: You will be eligible annually for $12,000 of financial planning assistance.

Annual Executive Physical: You will be eligible to participate in an annual executive physical program.

Paid Time Off: You will receive 26 days a year starting January 1, 2022.

Change of Control/Severance: You will receive a Change of Control/Severance Agreement commensurate with Senior Vice President level.

•Severance: Provides for a severance payment equal to one year of your base compensation plus target bonus in the event your employment with Littelfuse is terminated without cause.

•Change of Control: Provides that should the Company be acquired, and your job is eliminated, you will receive a Change of Control payment as outlined in the enclosed agreement.

Post Offer Contingencies: As a condition of employment, you must successfully complete a post-offer drug screen prior to your start date. This drug screen can be performed at an approved Sterling Check Lab. Other contingencies associated with this offer include the satisfactory review of your completed employment application and a criminal background check.

Maggie, I have a high level of confidence in your abilities and look forward to you having a successful and rewarding career here at Littelfuse.

Sincerely,

David Heinzmann

President and Chief Executive Officer

ACCEPTANCE

I, Maggie Chu, accept the Company’s offer of employment on the terms and conditions stated in this letter.

Signature: /s/ Maggie Chu Dated: April 28, 2021

-2-

Sign-On Bonus Repayment Agreement

I agree that if my employment with Littelfuse ends within the first 24 months from the date of commencement, because of my resignation (regardless of any reason), I will repay to Littelfuse the sign-on bonus. I agree that this repayment obligation cannot be waived.

The amount I must repay will be determined by the following formula:

Repayment amount = Sign-On Bonus x [(24 – Full or Partial Months of Service) ÷ 24]

I agree that the Repayment Amount will become fully due and payable upon my termination of employment.

I hereby authorize Littelfuse, to the full extent allowed by law, to deduct the Repayment Amount from any monies owed to me by Littelfuse, including, but not limited to: wages, bonus, reimbursement for expenses, payment for unused benefits, and/or any other sums payable to me by Littelfuse.

Accepted by:

Signature: /s/ Maggie Chu

Maggie Chu

-3-

EX-31.1

EXHIBIT 31.1

SECTION 302 CERTIFICATION

I, David W. Heinzmann, certify that:

1I have reviewed this Quarterly Report on Form 10-Q of Littelfuse Inc.;

2Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a)all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b)any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Dated: July 28, 2021
	/s/ David W. Heinzmann
	David W. Heinzmann President and Chief Executive Officer

EX-31.2

EXHIBIT 31.2

SECTION 302 CERTIFICATION

I, Meenal A. Sethna, certify that:

1I have reviewed this Quarterly Report on Form 10-Q of Littelfuse Inc.;

2Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a)all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b)any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Dated: July 28, 2021
	/s/ Meenal A. Sethna
	Meenal A. Sethna Executive Vice President and Chief Financial Officer

EX-32.1

EXHIBIT 32.1

LITTELFUSE, INC.

Certification Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, 18 U.S.C. Section 1350

Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (subsections (a) and (b) of Section 1350, Chapter 63 of title 18, United States Code), each of the undersigned officers of Littelfuse, Inc. (“the Company”) does hereby certify that to his knowledge:

The Quarterly Report of the Company on Form 10-Q for the fiscal quarter ended June 26, 2021 (“the Report”) fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934, and the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ David W. Heinzmann	/s/ Meenal A. Sethna
David W. Heinzmann	Meenal A. Sethna
President and Chief Executive Officer	Executive Vice President and Chief Financial Officer
Dated: July 28, 2021	Dated: July 28, 2021

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Cover Page - shares	6 Months Ended
	Jun. 26, 2021	Jul. 23, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 26, 2021
Document Transition Report	false
Entity File Number	0-20388
Entity Registrant Name	LITTELFUSE INC /DE
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	36-3795742
Entity Address, Address Line One	8755 West Higgins Road
Entity Address, Address Line Two	Suite 500
Entity Address, City or Town	Chicago
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	60631
City Area Code	773
Local Phone Number	628-1000
Title of 12(b) Security	Common Stock, $0.01 par value
Trading Symbol	LFUS
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		24,617,137
Entity Central Index Key	0000889331
Current Fiscal Year End Date	--12-26
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2
Amendment Flag	false

XML

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 26, 2021	Dec. 26, 2020
Current assets:
Cash and cash equivalents	$ 616,330	$ 687,525
Short-term investments	18	54
Trade receivables, less allowances of $46,328 and $45,237 at June 26, 2021 and December 26, 2020, respectively	313,332	232,760
Inventories	325,774	258,002
Prepaid income taxes and income taxes receivable	3,961	3,029
Prepaid expenses and other current assets	59,503	35,939
Total current assets	1,318,918	1,217,309
Net property, plant, and equipment	352,826	344,178
Intangible assets, net of amortization	307,771	291,887
Goodwill	851,070	816,812
Investments	39,255	30,547
Deferred income taxes	9,837	11,224
Right of use lease assets, net	28,465	17,615
Other assets	19,356	18,021
Total assets	2,927,498	2,747,593
Current liabilities:
Accounts payable	205,138	145,984
Accrued liabilities	126,445	110,478
Accrued income taxes	25,109	19,186
Current portion of long-term debt	25,000	0
Total current liabilities	381,692	275,648
Long-term debt, less current portion	626,917	687,034
Deferred income taxes	47,518	50,134
Accrued post-retirement benefits	43,176	45,802
Non-current operating lease liabilities	19,241	12,950
Other long-term liabilities	66,734	67,252
Shareholders’ equity:
Common stock, par value $0.01 per share: 34,000,000 shares authorized; shares issued, June 26, 2021–26,280,882; December 26, 2020–26,131,544	260	259
Additional paid-in capital	930,106	907,858
Treasury stock, at cost: 1,664,200 and 1,644,283 shares, respectively	(247,963)	(242,366)
Accumulated other comprehensive loss	(90,574)	(91,157)
Retained earnings	1,150,260	1,034,048
Littelfuse, Inc. shareholders’ equity	1,742,089	1,608,642
Non-controlling interest	131	131
Total equity	1,742,220	1,608,773
Total liabilities and equity	$ 2,927,498	$ 2,747,593

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CONDENSED CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($) $ in Thousands	Jun. 26, 2021	Dec. 26, 2020
Statement of Financial Position [Abstract]
Allowance for trade receivables	$ 46,328	$ 45,237
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock authorized (in shares)	34,000,000	34,000,000
Common stock issued (in shares)	26,280,882	26,131,544
Treasury stock (in shares)	1,664,200	1,644,283

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CONDENSED CONSOLIDATED STATEMENTS OF NET INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 26, 2021	Jun. 27, 2020	Jun. 26, 2021	Jun. 27, 2020
Income Statement [Abstract]
Net sales	$ 523,488	$ 307,337	$ 987,282	$ 653,433
Cost of sales	326,092	207,435	629,420	429,175
Gross profit	197,396	99,902	357,862	224,258
Selling, general, and administrative expenses	73,315	53,199	131,603	104,399
Research and development expenses	16,394	13,161	31,133	27,624
Amortization of intangibles	10,641	9,827	21,162	19,808
Restructuring, impairment, and other charges	789	35,665	1,226	39,627
Total operating expenses	101,139	111,852	185,124	191,458
Operating income (loss)	96,257	(11,950)	172,738	32,800
Interest expense	4,626	5,855	9,299	11,273
Foreign exchange (gain) loss	(1,676)	(6,010)	5,161	(3,426)
Other (income) expense, net	(1,890)	(1,210)	(9,627)	39
Income (loss) before income taxes	95,197	(10,585)	167,905	24,914
Income taxes	13,102	(1,594)	28,097	9,261
Net income (loss)	$ 82,095	$ (8,991)	$ 139,808	$ 15,653
Earnings (loss) per share:
Basic (in dollars per share)	$ 3.34	$ (0.37)	$ 5.69	$ 0.64
Diluted (in dollars per share)	$ 3.30	$ (0.37)	$ 5.62	$ 0.64
Weighted-average shares and equivalent shares outstanding:
Basic (in shares)	24,592	24,312	24,562	24,353
Diluted (in shares)	24,900	24,312	24,894	24,520

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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 26, 2021	Jun. 27, 2020	Jun. 26, 2021	Jun. 27, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 82,095	$ (8,991)	$ 139,808	$ 15,653
Other comprehensive income (loss):
Pension and postemployment adjustment, net of tax	329	(10,839)	783	(10,278)
Foreign currency translation adjustments	5,125	8,422	(200)	(7,118)
Comprehensive income (loss)	$ 87,549	$ (11,408)	$ 140,391	$ (1,743)

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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 27, 2020 USD ($)	Jun. 26, 2021 USD ($)	Jun. 27, 2020 USD ($)
OPERATING ACTIVITIES
Net income (loss)	$ (8,991)	$ 139,808	$ 15,653
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	13,900	27,251	27,728
Amortization of intangibles	9,827	21,162	19,808
Deferred revenue		(316)	(289)
Non-cash inventory charges		6,807	0
Impairment charges	33,841	0	36,078
Stock-based compensation		12,238	10,852
(Gain) loss on investments and other assets		(8,865)	542
Deferred income taxes		(2,172)	2,512
Other		7,842	(1,222)
Changes in operating assets and liabilities:
Trade receivables		(69,881)	13,914
Inventories		(38,205)	(10,761)
Accounts payable		38,955	3,439
Accrued liabilities and income taxes		4,488	(19,144)
Prepaid expenses and other assets		(12,766)	2,176
Net cash provided by operating activities		126,346	101,286
INVESTING ACTIVITIES
Acquisitions of businesses, net of cash acquired		(109,852)	0
Purchases of property, plant, and equipment		(32,657)	(29,479)
Net proceeds from sale of property, plant and equipment, and other		2,569	89
Net cash used in investing activities		(139,940)	(29,390)
FINANCING ACTIVITIES
Proceeds of revolving credit facility		0	240,000
Payments of revolving credit facility		(30,000)	0
Payments of term loan		0	(145,000)
Net proceeds related to stock-based award activities		4,413	3,642
Purchases of common stock		0	(22,927)
Debt issuance costs		0	(1,786)
Cash dividends paid		(23,596)	(23,403)
Net cash (used in) provided by financing activities		(49,183)	50,526
Effect of exchange rate changes on cash, cash equivalents, and restricted cash		(2,894)	(1,694)
(Decrease) increase in cash, cash equivalents, and restricted cash		(65,671)	120,728
Cash, cash equivalents, and restricted cash at beginning of period		687,525	531,139
Cash, cash equivalents, and restricted cash at end of period	651,867	621,854	651,867
Supplementary Cash Flow Information
Cash and cash equivalents	651,867	616,330	651,867
Restricted cash included in prepaid expenses and other current assets	0	3,790	0
Restricted cash included in other assets	0	1,734	0
Cash paid during the period for interest	$ 3,400	8,719	10,799
Capital expenditures, not yet paid		$ 6,826	$ 4,665

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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Addl. Paid in Capital	Treasury Stock	Accum. Other Comp. (Loss)	Retained Earnings	Non-controlling Interest
Balance at Dec. 28, 2019	$ 1,496,014	$ 256	$ 867,996	$ (216,447)	$ (106,823)	$ 950,901	$ 131
Increase (Decrease) in Stockholders' Equity
Net income (loss)	24,644					24,644
Other comprehensive loss, net of tax	(14,979)				(14,979)
Stock-based compensation	2,965		2,965
Withheld shares on restricted share units for withholding taxes	(443)			(443)
Stock options exercised	3,399		3,399
Repurchases of common stock	(22,927)			(22,927)
Cash dividends paid	(11,725)					(11,725)
Balance at Mar. 28, 2020	1,476,948	256	874,360	(239,817)	(121,802)	963,820	131
Balance at Dec. 28, 2019	1,496,014	256	867,996	(216,447)	(106,823)	950,901	131
Increase (Decrease) in Stockholders' Equity
Net income (loss)	15,653
Other comprehensive loss, net of tax	(17,396)
Repurchases of common stock	(22,900)
Balance at Jun. 27, 2020	1,462,434	257	885,306	(242,192)	(124,219)	943,151	131
Balance at Mar. 28, 2020	1,476,948	256	874,360	(239,817)	(121,802)	963,820	131
Increase (Decrease) in Stockholders' Equity
Net income (loss)	(8,991)					(8,991)
Other comprehensive loss, net of tax	(2,417)				(2,417)
Stock-based compensation	7,887		7,887
Withheld shares on restricted share units for withholding taxes	(2,375)			(2,375)
Stock options exercised	3,060	1	3,059
Cash dividends paid	(11,678)					(11,678)
Balance at Jun. 27, 2020	1,462,434	257	885,306	(242,192)	(124,219)	943,151	131
Balance at Dec. 26, 2020	1,608,773	259	907,858	(242,366)	(91,157)	1,034,048	131
Increase (Decrease) in Stockholders' Equity
Net income (loss)	57,713					57,713
Other comprehensive loss, net of tax	(4,871)				(4,871)
Stock-based compensation	3,395		3,395
Stock options exercised	7,509		7,509
Cash dividends paid	(11,782)					(11,782)
Balance at Mar. 27, 2021	1,660,737	259	918,762	(242,366)	(96,028)	1,079,979	131
Balance at Dec. 26, 2020	1,608,773	259	907,858	(242,366)	(91,157)	1,034,048	131
Increase (Decrease) in Stockholders' Equity
Net income (loss)	139,808
Other comprehensive loss, net of tax	583
Balance at Jun. 26, 2021	1,742,220	260	930,106	(247,963)	(90,574)	1,150,260	131
Balance at Mar. 27, 2021	1,660,737	259	918,762	(242,366)	(96,028)	1,079,979	131
Increase (Decrease) in Stockholders' Equity
Net income (loss)	82,095					82,095
Other comprehensive loss, net of tax	5,454				5,454
Stock-based compensation	8,843		8,843
Withheld shares on restricted share units for withholding taxes	(5,597)			(5,597)
Stock options exercised	2,502	1	2,501
Cash dividends paid	(11,814)					(11,814)
Balance at Jun. 26, 2021	$ 1,742,220	$ 260	$ 930,106	$ (247,963)	$ (90,574)	$ 1,150,260	$ 131

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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parentheticals) - $ / shares	3 Months Ended
	Jun. 26, 2021	Mar. 27, 2021	Jun. 27, 2020	Mar. 28, 2020
Statement of Stockholders' Equity [Abstract]
Cash dividends paid, per share (in dollars per share)	$ 0.48	$ 0.48	$ 0.48	$ 0.48

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Summary of Significant Accounting Policies and Other Information

6 Months Ended

Jun. 26, 2021

Accounting Policies [Abstract]

Summary of Significant Accounting Policies and Other Information

Summary of Significant Accounting Policies and Other Information

Nature of Operations 

Founded in 1927, Littelfuse is an industrial technology manufacturing company empowering a sustainable, connected, and safer world. Across more than 15 countries, and with 12,000 global associates, we partner with customers to design and deliver innovative, reliable solutions. Serving over 100,000 end customers, our products are found in a variety of industrial, transportation and electronics end markets – everywhere, every day.

Basis of Presentation 

The Company’s accompanying unaudited Condensed Consolidated Financial Statements have been prepared in accordance with U.S. Generally Accepted Accounting Principles (“GAAP”) for interim financial information, the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, certain information and disclosures normally included in the consolidated balance sheets, statements of net income and comprehensive income, statements of cash flows, and statement of stockholders' equity prepared in conformity with U.S. GAAP have been condensed or omitted as permitted by such rules and regulations, although the Company believes that the disclosures made are adequate to make the information not misleading. They have been prepared in accordance with accounting policies described in the Company’s Annual Report on Form 10-K for the fiscal year ended December 26, 2020 which should be read in conjunction with the disclosures therein. In the opinion of management, all adjustments considered necessary for a fair presentation have been included and are of a normal, recurring nature. Operating results for interim periods are not necessarily indicative of annual operating results.

Revenue Recognition

Revenue Disaggregation

The following tables disaggregate the Company’s revenue by primary business units for the three and six months ended June 26, 2021 and June 27, 2020:

	Three Months Ended June 26, 2021								Six Months Ended June 26, 2021
(in thousands)	Electronics Segment		Automotive Segment		Industrial Segment		Total		Electronics Segment		Automotive Segment		Industrial Segment		Total
Electronics – Passive Products and Sensors	$	155,276	$	—	$	—	$	155,276	$	287,713	$	—	$	—	$	287,713
Electronics – Semiconductor	170,071		—		—		170,071		324,169		—		—		324,169
Passenger Car Products	—		68,048		—		68,048		—		135,949		—		135,949
Automotive Sensors	—		26,685		—		26,685		—		54,969		—		54,969
Commercial Vehicle Products	—		38,585		—		38,585		—		70,929		—		70,929
Industrial Products	—		—		64,823		64,823		—		—		113,553		113,553
Total	$	325,347	$	133,318	$	64,823	$	523,488	$	611,882	$	261,847	$	113,553	$	987,282

	Three Months Ended June 27, 2020								Six Months Ended June 27, 2020
(in thousands)	Electronics Segment		Automotive Segment		Industrial Segment		Total		Electronics Segment		Automotive Segment		Industrial Segment		Total
Electronics – Passive Products and Sensors	$	92,846	$	—	$	—	$	92,846	$	177,444	$	—	$	—	$	177,444
Electronics – Semiconductor	130,425		—		—		130,425		260,016		—		—		260,016
Passenger Car Products	—		30,309		—		30,309		—		82,954		—		82,954
Automotive Sensors	—		13,899		—		13,899		—		38,073		—		38,073
Commercial Vehicle Products	—		17,791		—		17,791		—		45,742		—		45,742
Industrial Products	—		—		22,067		22,067		—		—		49,204		49,204
Total	$	223,271	$	61,999	$	22,067	$	307,337	$	437,460	$	166,769	$	49,204	$	653,433

See Note 15, Segment Information for net sales by segment and countries.

Revenue Recognition

The Company recognizes revenue on product sales in the period in which the Company satisfies its performance obligation and control of the product is transferred to the customer. The Company’s sales arrangements with customers are predominately short term in nature and generally provide for transfer of control at the time of shipment as this is the point at which title and risk of loss of the product transfers to the customer. At the end of each period, for those shipments where title to the products and the risk of loss and rewards of ownership do not transfer until the product has been received by the customer, the Company adjusts revenues and cost of sales for the delay between the time that the products are shipped and when they are received by the customer. The amount of revenue recorded reflects the consideration to which the Company expects to be entitled in exchange for goods and may include adjustments for customer allowance, rebates and price adjustments. The Company’s distribution channels are primarily through direct sales and independent third-party distributors.

The Company elected the practical expedient under Accounting Standards Codification ("ASC") 340-40-25-4 to expense commissions when incurred as the amortization period of the commission asset the Company would have otherwise recognized is less than one year.

Revenue and Billing

The Company generally accepts orders from customers through receipt of purchase orders or electronic data interchange based on written sales agreements and purchasing contracts. Contract pricing and selling agreement terms are based on market factors, costs, and competition. Pricing is often negotiated as an adjustment (premium or discount) from the Company’s published price lists. The customer is invoiced when the Company’s products are shipped to them in accordance with the terms of the sales agreement. As the Company’s standard payment terms are less than one year, the Company elected the practical expedient under ASC 606-10-32-18 to not assess whether a contract has a significant financing component. The Company also elected the practical expedient provided in ASC 606-10-25-18B to treat all product shipping and handling activities as fulfillment activities, and therefore recognize the gross revenue associated with the contract, inclusive of any shipping and handling revenue.

Ship and Debit Program

Some of the terms of the Company’s sales agreements and normal business conditions provide customers (distributors) the ability to receive price adjustments on products previously shipped and invoiced. This practice is common in the industry and is referred to as a “ship and debit” program. This program allows the distributor to debit the Company for the difference between the distributors’ contracted price and a lower price for specific transactions. Under certain circumstances (usually in a competitive situation or large volume opportunity), a distributor will request authorization for pricing allowances to reduce its price. When the Company approves such a reduction, the distributor is authorized to “debit” its account for the difference between the contracted price and the lower approved price. The Company establishes reserves for this program based on historic activity, electronic distributor inventory levels and actual authorizations for the debit and recognizes these debits as a reduction of revenue.

Return to Stock 

The Company has a return to stock policy whereby certain customers, with prior authorization from Littelfuse management, can return previously purchased goods for full or partial credit. The Company establishes an estimated allowance for these returns based on historic activity. Sales revenue and cost of sales are reduced to anticipate estimated returns.

Volume Rebates

The Company offers volume based sales incentives to certain customers to encourage greater product sales. If customers achieve their specific quarterly or annual sales targets, they are entitled to rebates. The Company estimates the projected amount of rebates that will be achieved by the customer and recognizes this estimated cost as a reduction to revenue as products are sold.

Cash, Cash Equivalents and Restricted Cash

The following table provides a reconciliation of cash, cash equivalents and restricted cash at June 26, 2021 and December 26, 2020 reported within the Condensed Consolidated Balance Sheets that sum to the total of the same such amounts shown in the Condensed Consolidated Statement of Cash Flows.

(in thousands)	June 26, 2021		December 26, 2020
Cash and cash equivalents	$	616,330	$	687,525
Restricted cash included in prepaid expenses and other current assets	3,790		—
Restricted cash included in other assets	1,734		$	—
Total cash, cash equivalents and restricted cash	$	621,854	$	687,525

Recently Adopted Accounting Standards

In December 2019, the Financial Accounting Standards Board (FASB) issued Accounting Standard Update ("ASU") No. 2019-12, "Income Taxes (Topic 740) - Simplifying the Accounting for Income Taxes" as part of its initiative to reduce complexity in the accounting standards. The guidance is effective for fiscal years beginning after December 15, 2020 with early adoption permitted. The adoption of ASU 2019-12 did not have a material impact on our Condensed Consolidated Financial Statements.

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Acquisitions

6 Months Ended

Jun. 26, 2021

Business Combination and Asset Acquisition [Abstract]

Acquisitions

Acquisitions

The Company accounts for acquisitions using the acquisition method in accordance with ASC 805, “Business Combinations,” in which assets acquired and liabilities assumed are recorded at fair value as of the date of acquisition. The operating results of the acquired business are included in the Company’s Consolidated Financial Statements from the date of the acquisition.

Hartland Controls

On January 28, 2021, the Company acquired Hartland Controls ("Hartland"), a manufacturer and leading supplier of electrical components used primarily in heating, ventilation, air conditioning (HVAC) and other industrial and control systems applications with annualized sales of approximately $70 million. The purchase price for Hartland was approximately $112.3 million and the operations of Hartland are included in the Industrial segment.

The total purchase consideration of $109.9 million, net of cash, cash equivalents, and restricted cash has been allocated, on a preliminary basis, to assets acquired and liabilities assumed, as of the completion of the acquisition, based on preliminary estimated fair values. The purchase consideration is subject to change for the final working capital adjustments. As of June 26, 2021, the Company had restricted cash of $1.7 million in an escrow account for general indemnification purposes. The purchase price allocation is preliminary because the evaluations necessary to assess the fair values of the net assets acquired are still in process. The primary areas that are not yet finalized relate to the completion of the valuation of certain contingent liabilities. As a result, these allocations are subject to change during the purchase price allocation period as the valuations are finalized.

The following table summarizes the purchase price allocation of the fair value of assets acquired and liabilities assumed in the Hartland acquisition:

(in thousands)	Purchase Price Allocation
Total purchase consideration:
Cash, net of cash acquired, and restricted cash	$	109,852
Allocation of consideration to assets acquired and liabilities assumed:
Trade receivables, net	13,027
Inventories	35,808
Other current assets	2,224
Property, plant, and equipment	6,296
Intangible assets	39,660
Goodwill	40,442
Other non-current assets	3,787
Current liabilities	(24,846)
Other non-current liabilities	(6,546)
	$	109,852

During the three months ended June 26, 2021, the Company recorded a cumulative net measurement period adjustment that increased goodwill by $ 1.5 million and resulted in a decrease to the fair value assigned to trade receivables, inventories and net current liabilities of $1.3 million, $0.5 million and $0.3 million, respectively. The measurement period adjustment was primarily associated with certain contingent liabilities and customer settlements. The Company made these measurement period adjustments to reflect facts and circumstances that existed as of the acquisition date.

All Hartland goodwill, other assets and liabilities were recorded in the Industrial segment and are primarily reflected in the Americas and Asia-Pacific geographic areas. The goodwill resulting from this acquisition consists largely of the Company’s expected future product sales and synergies from combining Hartland’s products and technology with the Company’s existing industrial products portfolio. Goodwill resulting from the Hartland acquisition is not expected to be deductible for tax purposes.

Included in the Company’s Condensed Consolidated Statements of Net Income for the three and six months ended June 26, 2021 are net sales of approximately $26.4 million and $43.1 million respectively, and a loss before income taxes of $0.3 million and $2.5 million, respectively since the January 28, 2021 acquisition of Hartland.

The Company recorded a $6.8 million step-up of inventory to its fair value as of the acquisition date based on the preliminary valuation. The step-up was amortized as a non-cash charge to cost of goods sold during the first and second quarters of 2021, as the acquired inventory was sold, and is reflected as other non-segment costs. During the three and six months ended June 26, 2021, the Company recognized a charge of $3.3 million and $6.8 million for the amortization of this fair value inventory step-up.

During the three and six months ended June 26, 2021, the Company incurred approximately $0.1 million and $0.8 million of legal and professional fees related to this acquisition recognized as Selling, general, and administrative expenses. These costs were reflected as other non-segment costs.

Pro Forma Results

The following table summarizes, on an unaudited pro forma basis, the combined results of operations of the Company and Hartland as though the acquisition had occurred as of December 29, 2019. The pro forma amounts presented are not necessarily indicative of either the actual consolidated results had the Hartland acquisition occurred as of December 29, 2019 or of future consolidated operating results.

	For the Three Months Ended				For the Six Months Ended
(in thousands, except per share amounts)	June 26, 2021		June 27, 2020		June 26, 2021		June 27, 2020
Net sales	$	523,488	$	323,713	$	994,320	$	687,330
Income (loss) before income taxes	98,644		(10,392)		175,939		21,039
Net income (loss)	84,818		(8,873)		146,143		12,565
Net income (loss) per share — basic	3.45		(0.36)		5.95		0.52
Net income (loss) per share — diluted	3.41		(0.36)		5.87		0.51

Pro forma results presented above primarily reflect the following adjustments:

	For the Three Months Ended				For the Six Months Ended
(in thousands)	June 26, 2021		June 27, 2020		June 26, 2021		June 27, 2020
Amortization(a)	$	—	$	(837)	$	(280)	$	(1,676)
Depreciation	—		47		7		95
Transaction costs(b)	128		(128)		835		(835)
Amortization of inventory step-up(c)	3,319		(1,659)		6,808		(6,796)
Income tax (expense) benefit of above items	(724)		541		(1,555)		1,940

(a)The amortization adjustment for the three and six months ended June 27, 2020 primarily reflects incremental amortization resulting for the measurement of intangibles at their fair values.

(b)The transaction cost adjustments reflect the reversal of certain legal and professional fees from the three and six months ended June 26, 2021 and recognition of those fees during the three and six months ended June 27, 2020.

(c)The amortization of inventory step-up adjustment reflects the reversal of the amount recognized during the three and six months ended June 26, 2021 and the recognition of the amortization during the three and six months ended June 27, 2020. The inventory step-up was amortized over four months as the inventory was sold.

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Inventories

6 Months Ended

Jun. 26, 2021

Inventory Disclosure [Abstract]

Inventories

Inventories

The components of inventories at June 26, 2021 and December 26, 2020 are as follows:

(in thousands)	June 26, 2021		December 26, 2020
Raw materials	$	111,769	$	85,394
Work in process	106,552		92,783
Finished goods	142,777		114,641
Inventory Reserves	(35,324)		(34,816)
Total	$	325,774	$	258,002

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Property, Plant, and Equipment

6 Months Ended

Jun. 26, 2021

Property, Plant and Equipment [Abstract]

Property, Plant, and Equipment

Property, Plant, and Equipment 

The components of net property, plant, and equipment at June 26, 2021 and December 26, 2020 are as follows:

(in thousands)	June 26, 2021		December 26, 2020
Land	$	21,795	$	22,851
Building	128,528		123,497
Equipment	706,115		678,220
Accumulated depreciation and amortization	(503,612)		(480,390)
Total	$	352,826	$	344,178

The Company recorded depreciation expense of $13.6 million and $13.9 million for the three months ended June 26, 2021 and June 27, 2020, respectively, and $27.3 million and $27.7 million for the six months ended June 26, 2021 and June 27, 2020, respectively.

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Goodwill and Other Intangible Assets

6 Months Ended

Jun. 26, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Other Intangible Assets

Goodwill and Other Intangible Assets

The amounts for goodwill and changes in the carrying value by segment for the six months ended June 26, 2021 are as follows:

(in thousands)	Electronics		Automotive		Industrial		Total
Net book value of goodwill as of December 26, 2020
Gross goodwill as of December 26, 2020	$	676,325	$	138,354	$	47,551	$	862,230
Accumulated impairment losses as of December 26, 2020	—		(36,423)		(8,995)		(45,418)
Total	676,325		101,931		38,556		816,812
Changes during 2021:
Additions(a)	—		—		40,442		40,442
Currency translation	(4,779)		(1,542)		137		(6,184)
Net book value of goodwill as of June 26, 2021
Gross goodwill as of June 26, 2021	671,546		136,699		88,130		896,375
Accumulated impairment losses as of June 26, 2021	—		(36,310)		(8,995)		(45,305)
Total	$	671,546	$	100,389	$	79,135	$	851,070

(a) The additions resulted from the acquisition of Hartland.

The Company tests its goodwill annually for impairment on the first day of its fiscal fourth quarter, or more frequently if an event occurs or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying value. During the second quarter of 2020, the Company recorded a non-cash charge of $33.8 million to recognize the impairment of goodwill in the automotive sensors reporting unit within the Automotive segment. The goodwill impairment charge was determined using Level 3 inputs, including discounted cash flow analysis and comparable marketplace fair value data. As of June 26, 2021, the automotive sensors reporting unit had $9.6 million of remaining goodwill.

The components of other intangible assets as of June 26, 2021 and December 26, 2020 are as follows:

	As of June 26, 2021
(in thousands)	Gross Carrying Value		Accumulated Amortization		Net Book Value
Land use rights	$	10,392	$	2,177	$	8,215
Patents, licenses and software	143,717		97,977		45,740
Distribution network	43,762		39,941		3,821
Customer relationships, trademarks, and tradenames	401,722		151,727		249,995
Total	$	599,593	$	291,822	$	307,771

	As of December 26, 2020
(in thousands)	Gross Carrying Value		Accumulated Amortization		Net Book Value
Land use rights	$	10,280	$	2,007	$	8,273
Patents, licenses and software	137,210		92,868		44,342
Distribution network	43,910		38,980		4,930
Customer relationships, trademarks, and tradenames	372,064		137,722		234,342
Total	$	563,464	$	271,577	$	291,887

During the three months ended June 26, 2021 and June 27, 2020, the Company recorded amortization expense of $10.6 million and $9.8 million, respectively. During the six months ended June 26, 2021 and June 27, 2020, the Company recorded amortization expense of $21.2 million and $19.8 million, respectively.

The Company recognized a $0.3 million non-cash impairment charge in the first quarter of 2020 on a certain patent triggered by the Company’s announcement to consolidate a manufacturing facility within the Industrial segment.

During the six months ended June 26, 2021, the Company recorded additions to intangible assets of $39.7 million, related to the Hartland acquisition, the components of which were as follows:

(in thousands)	Weighted Average Useful Life	Amount
Patents, licenses and software	9.2	$	7,559
Customer relationships, trademarks, and tradenames	13.7	32,101
Total		$	39,660

Estimated annual amortization expense related to intangible assets with definite lives as of June 26, 2021 is as follows:

(in thousands)	Amount
2021	$	41,868
2022	40,877
2023	36,569
2024	33,135
2025	32,682
2026 and thereafter	143,802
Total	$	328,933

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Accrued Liabilities

6 Months Ended

Jun. 26, 2021

Payables and Accruals [Abstract]

Accrued Liabilities

Accrued Liabilities

The components of accrued liabilities as of June 26, 2021 and December 26, 2020 are as follows:

(in thousands)	June 26, 2021		December 26, 2020
Employee-related liabilities	$	64,909	$	50,689
Operating lease liability	8,853		6,811
Other non-income taxes	8,815		2,126
Interest	4,506		4,517
Professional services	2,962		3,321
Deferred revenue	2,444		2,959
Restructuring liability	1,109		4,195
Customer liability	790		3,858
Other	32,057		32,002
Total	$	126,445	$	110,478

Employee-related liabilities consist primarily of payroll, sales commissions, bonus, employee benefit accruals and workers’ compensation. Bonus accruals include amounts earned pursuant to the Company’s primary employee incentive compensation plans. Other accrued liabilities include miscellaneous operating accruals and other client-related liabilities.

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Restructuring, Impairment and Other Charges

6 Months Ended

Jun. 26, 2021

Restructuring and Related Activities [Abstract]

Restructuring, Impairment and Other Charges

Restructuring, Impairment, and Other Charges

The Company recorded restructuring, impairment and other charges for the three and six months ended June 26, 2021 and June 27, 2020 as follows:

	Three months ended June 26, 2021								Six months ended June 26, 2021
(in thousands)	Electronics		Automotive		Industrial		Total		Electronics		Automotive		Industrial		Total
Employee terminations	$	295	$	416	$	6	$	717	$	552	$	416	$	169	$	1,137
Other restructuring charges	—		72		—		72		—		89		—		89
Total restructuring charges	295		488		6		789		552		505		169		1,226
Total	$	295	$	488	$	6	$	789	$	552	$	505	$	169	$	1,226

	Three months ended June 27, 2020								Six months ended June 27, 2020
(in thousands)	Electronics		Automotive		Industrial		Total		Electronics		Automotive		Industrial		Total
Employee terminations	$	856	$	209	$	750	$	1,815	$	1,737	$	608	$	1,071	$	3,416
Other restructuring charges	(1)		(12)		22		9		—		108		25		133
Total restructuring charges	855		197		772		1,824		1,737		716		1,096		3,549
Impairment	—		33,841		—		33,841		—		33,841		2,237		36,078
Total	$	855	$	34,038	$	772	$	35,665	$	1,737	$	34,557	$	3,333	$	39,627

2021

For the three and six months ended June 26, 2021, the Company recorded total restructuring charges of $0.8 million and $1.2 million, primarily for employee termination costs. These charges are primarily related to the reorganization of certain manufacturing, selling and administrative functions within the Automotive and Electronics segments.

2020

For the three and six months ended June 27, 2020, the Company recorded total restructuring charges of $1.8 million and $3.5 million, respectively, for employee termination costs and other restructuring charges. These charges are primarily related to the reorganization of certain manufacturing, selling and administrative functions across all segments and the announced consolidation of a manufacturing facility within the Industrial segment. The Company also recognized $33.8 million and $36.1 million of impairment charges for the three and six months ended June 27, 2020, respectively, which included a $33.8 million goodwill impairment charge associated with the automotive sensors reporting unit within the Automotive segment in the second quarter of 2020 and $2.2 million related to the land and building associated with the Company’s previously announced consolidation of a manufacturing facility within the Industrial segment in the first quarter of 2020. The impairment charges of the land and building were included in selling, genera,l and administrative expenses. See Note 5, Goodwill and Other Intangible Assets for further discussion regarding the goodwill impairment charge.

The restructuring liability as of June 26, 2021 and December 26, 2020 is $2.9 million and $4.2 million, respectively. The current portion of the total restructuring liability included within accrued liabilities is $1.1 million while the long-term balance of $1.8 million was included within other long-term liabilities, respectively, in the Condensed Consolidated Balance Sheets as of June 26, 2021. The Company anticipates the remaining payments associated with employee terminations will primarily be completed by the third quarter of 2022.

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Debt

6 Months Ended

Jun. 26, 2021

Debt Disclosure [Abstract]

Debt

Debt

The carrying amounts of debt at June 26, 2021 and December 26, 2020 are as follows:

(in thousands)	June 26, 2021		December 26, 2020
Revolving Credit Facility	$	100,000	$	130,000
Euro Senior Notes, Series A due 2023	139,610		142,679
Euro Senior Notes, Series B due 2028	113,359		115,850
U.S. Senior Notes, Series A due 2022	25,000		25,000
U.S. Senior Notes, Series B due 2027	100,000		100,000
U.S. Senior Notes, Series A due 2025	50,000		50,000
U.S. Senior Notes, Series B due 2030	125,000		125,000
Other	2,619		2,619
Unamortized debt issuance costs	(3,671)		(4,114)
Total debt	651,917		687,034
Less: Current maturities	(25,000)		—
Total long-term debt	$	626,917	$	687,034

Revolving Credit Facility

On April 3, 2020, the Company amended its Credit Agreement to effect certain changes, including, among others: (i) eliminating the $200.0 million unsecured term loan credit facility, the remaining outstanding balance ($140.0 million) of which was repaid in full on April 3, 2020 through the revolving credit facility; (ii) making certain financial and non-financial covenants less restrictive on the Company; (iii) modifying performance-based interest rate margins and undrawn fees; and (iv) extending the maturity date to April 3, 2025. The amended Credit Agreement also allows the Company to increase the size of the revolving credit facility or enter into one or more tranches of term loans if there is no event of default and the Company is in compliance with certain financial covenants. The Company made payments of $30.0 million on the amended revolving credit facility during the six months ended June 26, 2021. The balance under the facility was $100.0 million as of June 26, 2021.

Outstanding borrowings under the amended Credit Agreement bears interest, at the Company’s option, at either LIBOR, fixed for interest periods of one, two, three or six-month periods, plus 1.25% to 2.00%, or at the bank’s Base Rate, as defined, plus 0.25% to 1.00%, based upon the Company’s Consolidated Leverage Ratio, as defined. The Company is also required to pay commitment fees on unused portions of the credit agreement ranging from 0.125% to 0.20%, based on the Consolidated Leverage Ratio, as defined in the agreement. The amended Credit Agreement includes representations, covenants and events of default that are customary for financing transactions of this nature. The effective interest rate on outstanding borrowings under the credit facility was 1.59% at June 26, 2021.

As of June 26, 2021, the Company had no amount outstanding in letters of credit and had available $600.0 million of borrowing capacity under the Revolving Credit Facility. At June 26, 2021, the Company was in compliance with all covenants under the Credit Agreement.

Senior Notes

On December 8, 2016, the Company entered into a Note Purchase Agreement, pursuant to which the Company issued and sold €212 million aggregate principal amount of senior notes in two series. The funding date for the Euro denominated senior notes occurred on December 8, 2016 for €117 million in aggregate amount of 1.14% Senior Notes, Series A, due December 8, 2023 (“Euro Senior Notes, Series A due 2023”), and €95 million in aggregate amount of 1.83% Senior Notes, Series B due December 8, 2028 (“Euro Senior Notes, Series B due 2028”) (together, the “Euro Senior Notes”). Interest on the Euro Senior Notes is payable semiannually on June 8 and December 8, commencing June 8, 2017.

On December 8, 2016, the Company entered into a Note Purchase Agreement, pursuant to which the Company issued and sold $125 million aggregate principal amount of senior notes in two series. On February 15, 2017, $25 million in aggregate principal amount of 3.03% Senior Notes, Series A, due February 15, 2022 (“U.S. Senior Notes, Series A due 2022”), and $100 million in aggregate principal amount of 3.74% Senior Notes, Series B, due February 15, 2027 (“U.S. Senior Notes, Series B due 2027”)

(together, the “U.S. Senior Notes due 2022 and 2027”) were funded. Interest on the U.S. Senior Notes due 2022 and 2027 is payable semiannually on February 15 and August 15, commencing August 15, 2017.

On November 15, 2017, the Company entered into a Note Purchase Agreement pursuant to which the Company issued and sold $175 million in aggregate principal amount of senior notes in two series. On January 16, 2018, $50 million aggregate principal amount of 3.48% Senior Notes, Series A, due February 15, 2025 (“U.S. Senior Notes, Series A due 2025”) and $125 million in aggregate principal amount of 3.78% Senior Notes, Series B, due February 15, 2030 (“U.S. Senior Notes, Series B due 2030”) (together the “U.S. Senior Notes due 2025 and 2030” and with the Euro Senior Notes and the U.S. Senior Notes due 2022 and 2027, the “Senior Notes”) were funded. Interest on the U.S. Senior Notes due 2025 and 2030 is payable semiannually on February 15 and August 15, commencing on August 15, 2018.

The Senior Notes have not been registered under the Securities Act, or applicable state securities laws. The Senior Notes are general unsecured senior obligations and rank equal in right of payment with all existing and future unsecured unsubordinated indebtedness of the Company.

The Senior Notes are subject to certain customary covenants, including limitations on the Company’s ability, with certain exceptions, to engage in mergers, consolidations, asset sales and transactions with affiliates, to engage in any business that would substantially change the general business of the Company, and to incur liens. In addition, the Company is required to satisfy certain financial covenants and tests relating to, among other matters, interest coverage and leverage. At June 26, 2021, the Company was in compliance with all covenants under the Senior Notes.

The Company may redeem the Senior Notes upon the satisfaction of certain conditions and the payment of a make-whole amount to noteholders and are required to offer to repurchase the Senior Notes at par following certain events, including a change of control.

Interest paid on all Company debt was $2.5 million and $3.4 million for the three months ended June 26, 2021 and June 27, 2020, respectively, and $8.7 million and $10.8 million for the six months ended June 26, 2021 and June 27, 2020, respectively.

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Fair Value of Assets and Liabilities

6 Months Ended

Jun. 26, 2021

Fair Value Disclosures [Abstract]

Fair Value of Assets and Liabilities

Fair Value of Assets and Liabilities

For assets and liabilities measured at fair value on a recurring and nonrecurring basis, a three-level hierarchy of measurements based upon observable and unobservable inputs is used to arrive at fair value. Observable inputs are developed based on market data obtained from independent sources, while unobservable inputs reflect the Company’s assumptions about valuation based on the best information available in the circumstances. Depending on the inputs, the Company classifies each fair value measurement as follows:

Level 1—Valuations based on unadjusted quoted prices for identical assets or liabilities in active markets;

Level 2—Valuations based upon quoted prices for similar instruments, prices for identical or similar instruments in markets that are not active, or model-derived valuations, all of whose significant inputs are observable, and

Level 3—Valuations based upon one or more significant unobservable inputs.

Following is a description of the valuation methodologies used for instruments measured at fair value and their classification in the valuation hierarchy.

Cash Equivalents

Cash equivalents primarily consist of money market funds, which are held with an institution with sound credit rating and are highly liquid. The Company classified cash equivalents as Level 1 and are valued at cost which approximates fair value.

Investments in Equity Securities

Investments in equity securities listed on a national market or exchange are valued at the last sales price and classified within Level 1 of the valuation hierarchy and recorded in investments and other assets.

Other Investments

The Company has certain convertible debt and convertible preferred stock investments that are accounted for under the cost method reflected in other assets in the Condensed Consolidated Balance Sheets. During the three and six months ended June 26, 2021, the Company impaired the remaining book value of these investments and recorded an impairment charge of $0.5 million in Other (income) expense, net in the Condensed Consolidated Statements of Net Income (Loss). As of December 26, 2020, the balances of these investments was $0.5 million. The fair value of these investments are measured on a nonrecurring basis using Level 3 inputs under the fair value hierarchy.

Mutual Funds

The Company has a non-qualified Supplemental Retirement and Savings Plan which provides additional retirement benefits for certain management employees and named executive officers by allowing participants to defer a portion of their annual compensation. The Company maintains accounts for participants through which participants make investment elections. The marketable securities are classified as Level 1 under the fair value hierarchy as they are maintained in mutual funds with readily determinable fair value and recorded in other assets.

There were no changes during the quarter ended June 26, 2021 to the Company’s valuation techniques used to measure asset and liability fair values on a recurring basis. As of June 26, 2021 and December 26, 2020, the Company did not hold any non-financial assets or liabilities that are required to be measured at fair value on a recurring basis.

The following table presents assets measured at fair value by classification within the fair value hierarchy as of June 26, 2021:

	Fair Value Measurements Using
(in thousands)	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Cash equivalents	$	25,768	$	—	$	—	$	25,768
Investments in equity securities	27,532		—		—		27,532
Mutual funds	14,545		—		—		14,545
Total	$	67,845	$	—	$	—	$	67,845

The following table presents assets measured at fair value by classification within the fair value hierarchy as of December 26, 2020: 

	Fair Value Measurements Using
(in thousands)	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Cash equivalents	$	73,461	$	—	$	—	$	73,461
Investments in equity securities	19,186		—		—		19,186
Mutual funds	13,249		—		—		13,249
Total	$	105,896	$	—	$	—	$	105,896

In addition to the methods and assumptions used for the financial instruments recorded at fair value as discussed above, the following methods and assumptions are used to estimate the fair value of other financial instruments that are not marked to market on a recurring basis. The Company’s other financial instruments include cash and cash equivalents, short-term investments, accounts receivable and its long-term debt. Due to their short-term maturity, the carrying amounts of cash and cash equivalents, short-term investments and accounts receivable approximate their fair values. The Company’s revolving credit facilities’ fair values approximate book value at June 26, 2021 and December 26, 2020, as the rates on these borrowings are variable in nature.

The carrying value and estimated fair values of the Company’s Euro Senior Notes, Series A and Series B and USD Senior Notes, Series A and Series B, as of June 26, 2021 and December 26, 2020 were as follows:

	June 26, 2021				December 26, 2020
(in thousands)	Carrying Value		Estimated Fair Value		Carrying Value		Estimated Fair Value
Euro Senior Notes, Series A due 2023	$	139,610	$	141,709	$	142,679	$	144,323
Euro Senior Notes, Series B due 2028	113,359		119,481		115,850		123,588
USD Senior Notes, Series A due 2022	25,000		25,284		25,000		25,437
USD Senior Notes, Series B due 2027	100,000		107,293		100,000		109,552
USD Senior Notes, Series A due 2025	50,000		52,845		50,000		53,474
USD Senior Notes, Series B due 2030	125,000		134,145		125,000		138,036

The Company recognized impairment charges of $1.9 million for the land and building and $0.3 million for a certain patent as a result of the Company’s announcement to consolidate a manufacturing facility within the Industrial segment during the first quarter of 2020. See Note 7, Restructuring, Impairment, and Other Charges, for further discussion. The fair value of the land and building was valued using a real estate appraisal and classified as a Level 3 input under the fair value hierarchy.

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Benefit Plans

6 Months Ended

Jun. 26, 2021

Retirement Benefits [Abstract]

Benefit Plans

Benefit Plans

The Company has company-sponsored defined benefit pension plans covering employees in the U.K., Germany, the Philippines, China, Japan, Mexico, Italy and France. The amount of the retirement benefits provided under the plans is based on years of service and final average pay.

The Company recognizes interest cost, expected return on plan assets, and amortization of prior service, net within Other (income) expense, net in the Condensed Consolidated Statements of Net Income (Loss). The components of net periodic benefit cost for the three and six months ended June 26, 2021 and June 27, 2020 were as follows: 

	For the Three Months Ended				For the Six Months Ended
(in thousands)	June 26, 2021		June 27, 2020		June 26, 2021		June 27, 2020
Components of net periodic benefit cost:
Service cost	$	700	$	592	$	1,402	$	1,210
Interest cost	443		486		883		1,144
Expected return on plan assets	(371)		(402)		(738)		(1,129)
Amortization of prior service and net actuarial loss	334		264		665		409
Net periodic benefit cost	$	1,106	$	940	$	2,212	$	1,634

The Company expects to make approximately $2.2 million of contributions to the plans and pay $3.8 million of benefits directly in 2021.

The Company also sponsors certain post-employment plans in foreign countries and other statutory benefit plans. The Company recorded expense of $0.5 million for both the three months ended June 26, 2021 and June 27, 2020, respectively, and $1.0 million expense for both the six months ended June 26, 2021 and June 27, 2020, respectively, in Cost of Sales and Other (income) expense, net within the Condensed Consolidated Statements of Net Income (Loss). For the three and six months ended June 26, 2021, the pre-tax amounts recognized in other comprehensive income (loss) as components of net periodic benefit costs for these plans were $0.2 million and 0.3 million. For three and six months ended June 27, 2020, the pre-tax amounts recognized in other comprehensive income (loss) as components of net periodic benefit costs for these plans were $0.2 million and $0.4 million, respectively.

On April 7, 2020, the Company entered into a definitive agreement to purchase a group annuity contract, under which an insurance company will be required to directly pay and administer pension payments to certain of the Company’s U.K. pension plan participants, or their designated beneficiaries. The purchase of this group annuity contract will reduce the Company’s outstanding pension benefit obligation by approximately $55 million, representing approximately 37% of the total obligations

of the Company’s qualified pension plans, and will be funded with pension plan assets and additional cash on hand. In connection with this transaction, the Company will record a one-time non-cash settlement charge currently estimated between $18 million and $22 million in the fourth quarter of 2021, reflecting the accelerated recognition of unamortized actuarial losses in the plan. The actual amount and timing of the settlement charge could differ from this estimate due to final data and plan wind-up expenses. Due to the signing of the group annuity contract being a significant change in the U.K. pension plan, the liabilities of the plan were remeasured as of April 6, 2020 resulting in an increase of $13.4 million (£10.9 million) to both the net pension liability and unamortized actuarial loss within other comprehensive income (loss) during the second quarter of 2020. Additionally, the Company made a cash contribution of $10.4 million (£8.4 million) under this agreement during the second quarter of 2020.

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Other Comprehensive Income (Loss)

6 Months Ended

Jun. 26, 2021

Equity [Abstract]

Other Comprehensive Income (Loss)

Other Comprehensive Income (Loss)

Changes in other comprehensive income (loss) by component were as follows:

(in thousands)	Three Months Ended June 26, 2021						Three Months Ended June 27, 2020
	Pre-tax		Tax		Net of Tax		Pre-tax		Tax		Net of Tax
Defined benefit pension plan and other adjustments	$	372	$	43	$	329	$	(13,098)	$	(2,259)	$	(10,839)
Foreign currency translation adjustments	5,125		—		5,125		8,422		—		8,422
Total change in other comprehensive income (loss)	$	5,497	$	43	$	5,454	$	(4,676)	$	(2,259)	$	(2,417)
(in thousands)	Six Months Ended June 26, 2021						Six Months Ended June 27, 2020
	Pre-tax		Tax		Net of Tax		Pre-tax		Tax		Net of Tax
Defined benefit pension plan adjustments	$	878	$	95	$	783	(12,543)		(2,265)		$	(10,278)
Foreign currency translation adjustments	(200)		—		(200)		$	(7,118)	$	—	$	(7,118)
Total change in other comprehensive income (loss)	$	678	$	95	$	583	$	(19,661)	$	(2,265)	$	(17,396)

Due to the signing of the group annuity contract being a significant change in the U.K. pension plan, the liabilities of the plan were remeasured as of April 6, 2020 resulting in an increase of $13.4 million to unamortized actuarial loss within other comprehensive income (loss). See Note 10, Benefits Plans for further discussion.

The following tables set forth the changes in accumulated other comprehensive (loss) by component for the six months ended June 26, 2021 and June 27, 2020:

(in thousands)	Defined benefit pension plan and other adjustments		Foreign currency translation adjustment		Accumulated other comprehensive (loss)
Balance at December 26, 2020	$	(34,141)	$	(57,016)	$	(91,157)
Activity in the period	783		(200)		583
Balance at June 26, 2021	$	(33,358)	$	(57,216)	$	(90,574)

(in thousands)	Defined benefit pension plan and other adjustments		Foreign currency translation adjustment		Accumulated other comprehensive (loss)
Balance at December 28, 2019	$	(18,046)	$	(88,777)	$	(106,823)
Activity in the period	(10,278)		(7,118)		(17,396)
Balance at June 27, 2020	$	(28,324)	$	(95,895)	$	(124,219)

Amounts reclassified from accumulated other comprehensive (loss) to earnings for the three and six months ended June 26, 2021 and June 27, 2020 were as follows:

	Three Months Ended				Six Months Ended
(in thousands)	June 26, 2021		June 27, 2020		June 26, 2021		June 27, 2020
Pension and Postemployment plans:
Amortization of prior service and net actuarial loss	$	509	$	429	$	1,013	$	774

The Company recognizes the amortization of prior service costs in Other (income) expense, net within the Condensed Consolidated Statements of Net Income.

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Income Taxes

6 Months Ended

Jun. 26, 2021

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

The effective tax rate for the three and six months ended June 26, 2021 was 13.8% and 16.7%, respectively, compared to the effective tax rate for the three and six months ended June 27, 2020 of 15.1% and 37.2%, respectively. The effective tax rate for the second quarter of 2021 (which is based upon pre-tax income) is lower than the effective tax rate for the comparable 2020 period (which is based upon a pre-tax loss), primarily due to an increase in the forecasted income earned in lower tax jurisdictions in 2021 as compared to 2020, as well as the impact of the goodwill impairment charge of $33.8 million recorded in the second quarter of 2020, the substantial majority of which did not result in a tax benefit. The effective tax rate for the first six months of 2021 is lower than the effective tax rate for the comparable 2020 period, primarily due to an increase in the forecasted income earned in lower tax jurisdictions in 2021 as compared to 2020, as well as the impact of the goodwill impairment charge of $33.8 million recorded in the second quarter of 2020. The effective tax rate for the 2021 periods is lower than the applicable U.S. statutory tax rate primarily due to income earned in lower tax jurisdictions.

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Earnings (loss) Per Share

6 Months Ended

Jun. 26, 2021

Earnings Per Share [Abstract]

Earnings (loss) Per Share

Earnings (loss) Per Share

The following table sets forth the computation of basic and diluted earnings per share: 

	Three Months Ended				Six Months Ended
(in thousands, except per share amounts)	June 26, 2021		June 27, 2020		June 26, 2021		June 27, 2020
Numerator:
Net income (loss) as reported	$	82,095	$	(8,991)	$	139,808	$	15,653
Denominator:
Weighted average shares outstanding
Basic	24,592		24,312		24,562		24,353
Effect of dilutive securities	308		—		332		167
Diluted	24,900		24,312		24,894		24,520
Earnings (loss) Per Share:
Basic earnings (loss) per share	$	3.34	$	(0.37)	$	5.69	$	0.64
Diluted earnings (loss) per share	$	3.30	$	(0.37)	$	5.62	$	0.64

Potential shares of common stock relating to stock options and restricted share units excluded from the earnings per share calculation because their effect would be anti-dilutive were 41,216 and 328,624 for the three months ended June 26, 2021 and June 27, 2020, respectively, and 20,266 and 212,290 for the six months ended June 26, 2021 and June 27, 2020, respectively.

Share Repurchase Program

On April 26, 2019, the Company's Board of Directors authorized a program to repurchase up to 1,000,000 shares of the Company's common stock for the period May 1, 2019 to April 30, 2020 ("2019 program"). On April 29, 2020, the Company announced that the Board of Directors authorized a new program to repurchase up to 1,000,000 shares of the Company's common stock for the period May 1, 2020 to April 30, 2021 (the "2020 program") to replace its previous expired 2019 program. On April, 28, 2021, the Company announced that the Board of Directors authorized a new three year program to repurchase up to $300.0 million in the aggregate of shares of the Company’s common stock for the period May 1, 2021 to April 30, 2024 to replace its previous 2020 program.

The Company did not repurchase any shares of its common stock for the three and six months ended June 26, 2021. During the six months ended June 27, 2020, the Company repurchased 175,110 shares of its common stock totaling $22.9 million.

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Related Party Transactions

6 Months Ended

Jun. 26, 2021

Related Party Transactions [Abstract]

Related Party Transactions

Related Party Transactions

The Company has equity ownership in various investments that are accounted for under the equity method. The following is a description of the investments and related party transactions.

Powersem GmbH: The Company owns 45% of the outstanding equity of Powersem GmbH (“Powersem”), a module manufacturer based in Germany.

EB-Tech Co., Ltd.: The Company owns approximately 19% of the outstanding equity of EB Tech Co., Ltd. (“EB Tech”), a company with expertise in radiation technology based in South Korea.

Automated Technology (Phil), Inc.: The Company owns approximately 24% of the outstanding common shares of Automated Technology (Phil), Inc. (“ATEC”), a supplier located in the Philippines that provides assembly and test services. One member of the Company's Board of Directors serves on the Board of Directors of ATEC.

	For the Three Months Ended June 26, 2021						For the Three Months Ended June 27, 2020
(in millions)	Powersem		EB Tech		ATEC		Powersem		EB Tech		ATEC
Sales to related party	$	—	$	—	$	—	$	0.3	$	—	$	—
Purchase material/service from related party	0.7		0.1		2.8		0.8		—		1.6
	For the Six Months Ended June 26, 2021						For the Six Months Ended June 27, 2020
(in millions)	Powersem		EB Tech		ATEC		Powersem		EB Tech		ATEC
Sales to related party	$	0.2	$	—	$	—	$	0.7	$	—	$	—
Purchase material/service from related party	1.8		0.2		5.8		1.0		—		3.4
	June 26, 2021						December 26, 2020
(in millions)	Powersem		EB Tech		ATEC		Powersem		EB Tech		ATEC
Accounts receivable balance	$	—	$	—	$	—	$	0.1	$	—	$	—
Accounts payable balance	0.1		—		1.8		0.1		—		0.2

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Segment Information

6 Months Ended

Jun. 26, 2021

Segment Reporting [Abstract]

Segment Information

Segment Information

The Company and its subsidiaries design, manufacture and sell components and modules empowering a sustainable, connected, and safer world. The Company reports its operations by the following segments: Electronics, Automotive, and Industrial. An operating segment is defined as a component of an enterprise that engages in business activities from which it may earn revenues and incur expenses, and about which separate financial information is regularly evaluated by the Chief Operating Decision Maker (“CODM”) in deciding how to allocate resources. The CODM is the Company’s President and Chief Executive Officer (“CEO”). The CODM allocates resources to and assesses the performance of each operating segment using information about its revenue and operating income (loss) before interest and taxes, but does not evaluate the operating segments using discrete balance sheet information.

Sales, marketing, and research and development expenses are charged directly into each operating segment. Purchasing, logistics, customer service, finance, information technology, and human resources are shared functions that are allocated back to the three operating segments. The Company does not report inter-segment revenue because the operating segments do not record it. Certain expenses, determined by the CODM to be strategic in nature and not directly related to segments' current results, are not allocated but identified as “Other”. Additionally, the Company does not allocate interest and other income, interest expense, or taxes to operating segments. These costs are not allocated to the segments, as management excludes such costs when assessing the performance of the segments. Although the CODM uses operating income (loss) to evaluate the segments, operating costs included in one segment may benefit other segments. Except as discussed above, the accounting policies for segment reporting are the same as for the Company as a whole.

•Electronics Segment: Consists of one of the broadest product offerings in the industry, including fuses and fuse accessories, positive temperature coefficient (“PTC”) resettable fuses, polymer electrostatic discharge (“ESD”) suppressors, varistors, reed switch based magnetic sensing, gas discharge tubes; semiconductor products such as discrete transient voltage suppressor (“TVS”) diodes, TVS diode arrays, protection and switching thyristors, metal-oxide-semiconductor field effect transistors (“MOSFETs”) and silicon carbide diodes; and insulated gate bipolar transistors (“IGBT”) technologies. The segment covers a broad range of end markets, including industrial motor drives and power conversion, automotive electronics, electric vehicle and related infrastructure, power supplies, data centers and telecommunications, medical devices, alternative energy, building and home automation, appliances, and mobile electronics.

•Automotive Segment: Consists of a wide range of circuit protection, power control and sensing technologies for global original equipment manufacturers (“OEMs”), Tier-I suppliers and parts distributors in passenger car, heavy duty truck, off-road vehicles, material handling, agricultural, construction and other commercial vehicle end markets. Passenger car fuse products for internal combustion engine, hybrid and electric vehicles including blade fuses, battery cable protectors, resettable fuses, high-current fuses, and high-voltage fuses. Commercial vehicle products include fuses, switches, relays, and power distribution modules used in applications serving a number of end markets, including

heavy truck, construction, agriculture and material handling. Automotive sensor products include a wide range of automotive and commercial vehicle products designed to monitor the passenger compartment occupant's safety and environment as well as the vehicle’s powertrain.

•Industrial Segment: Consists of industrial circuit protection products (i.e. fuses, power distribution modules, switches) and industrial control products (i.e. relays, transformers, contactors, sensors). These products are used in a variety of applications and end-markets including: Renewable Energy, Energy Storage, HVAC, Electric Vehicle Infrastructure, Industrial Equipment, Industrial Automation, Construction, Mining, and Oil & Gas.

Segment information is summarized as follows: 

	Three Months Ended				Six Months Ended
(in thousands)	June 26, 2021		June 27, 2020		June 26, 2021		June 27, 2020
Net sales
Electronics	$	325,347	$	223,271	$	611,882	$	437,460
Automotive	133,318		61,999		261,847		166,769
Industrial	64,823		22,067		113,553		49,204
Total net sales	$	523,488	$	307,337	$	987,282	$	653,433
Depreciation and amortization
Electronics	$	15,114	$	15,617	$	30,495	31,148
Automotive	6,946		7,071		14,019		14,258
Industrial	2,155		1,046		3,899		2,130
Total depreciation and amortization	$	24,215	$	23,734	$	48,413	$	47,536
Operating income (loss)
Electronics	$	74,236	$	32,651	$	129,759	$	64,923
Automotive	19,258		(8,857)		39,574		5,259
Industrial	8,375		(23)		11,881		3,511
Other(a)	(5,612)		(35,721)		(8,476)		(40,893)
Total operating income (loss)	96,257		(11,950)		172,738		32,800
Interest expense	4,626		5,855		9,299		11,273
Foreign exchange (gain) loss	(1,676)		(6,010)		5,161		(3,426)
Other (income) expense, net	(1,890)		(1,210)		(9,627)		39
Income (loss) before income taxes	$	95,197	$	(10,585)	$	167,905	$	24,914

(a) Included in “Other” Operating income for the second quarter of 2021 was $3.3 million ($6.8 million year-to-date) of purchase accounting inventory step-up charges, $0.5 million ($1.3 million year-to-date) of legal and professional fees and other integration expenses related to Hartland and other contemplated acquisitions, and $0.8 million ($1.3 million year-to-date) of restructuring, impairment and other charges, primarily related to employee termination costs. See Note 7, Restructuring, Impairment, and Other Charges, for further discussion. In addition, there was a loss of $1.0 million recorded during the second quarter of 2021 for a total year-to-date gain of $0.9 million from the sale of a building within the Electronics segment.

Included in “Other” Operating (loss) income for the 2020 second quarter is $0.1 million ($1.3 million year-to-date) of acquisition-related and integration charges related to the IXYS acquisition and other contemplated acquisitions. In addition, there was $35.6 million ($39.6 million year-to-date) of restructuring, impairment and other charges, primarily related to the goodwill impairment charge of $33.8 million recorded in the second quarter associated with the automotive sensors reporting unit within the Automotive segment, $1.8 million ($3.5 million year-to-date) of employee termination costs, and other restructuring charges and impairment charges of $2.2 million recorded in the first quarter associated with the announced consolidation of a manufacturing facility within the Industrial segment. See Note 5, Goodwill and Other Intangible Assets and Note 7, Restructuring, Impairment, and Other Charges, for further discussion.

The Company’s net sales by country were as follows: 

	Three Months Ended				Six Months Ended
(in thousands)	June 26, 2021		June 27, 2020		June 26, 2021		June 27, 2020
Net sales
United States	$	154,797	$	76,870	$	285,728	$	179,780
China	156,086		102,026		295,244		188,041
Other countries(a)	212,605		128,441		406,310		285,612
Total net sales	$	523,488	$	307,337	$	987,282	$	653,433

 The Company’s long-lived assets by country were as follows:

(in thousands)	June 26, 2021		December 26, 2020
Long-lived assets
United States	$	47,509	$	46,132
China	87,497		85,876
Mexico	76,700		70,125
Germany	37,447		37,976
Philippines	69,308		66,994
Other countries(a)	34,365		37,075
Total long-lived assets	$	352,826	$	344,178

The Company’s additions to long-lived assets by country were as follows:

	Six Months Ended
(in thousands)	June 26, 2021		June 27, 2020
Additions to long-lived assets
United States	$	1,732	$	2,026
China	7,127		4,516
Mexico	13,231		4,260
Germany	2,533		2,509
Philippines	6,941		9,039
Other countries(a)	1,793		687
Total additions to long-lived assets	$	33,357	$	23,037

(a)Each country included in other countries is less than 10% of net sales.

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Summary of Significant Accounting Policies and Other Information (Policies)

6 Months Ended

Jun. 26, 2021

Accounting Policies [Abstract]

Basis of Presentation

Basis of Presentation 

The Company’s accompanying unaudited Condensed Consolidated Financial Statements have been prepared in accordance with U.S. Generally Accepted Accounting Principles (“GAAP”) for interim financial information, the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, certain information and disclosures normally included in the consolidated balance sheets, statements of net income and comprehensive income, statements of cash flows, and statement of stockholders' equity prepared in conformity with U.S. GAAP have been condensed or omitted as permitted by such rules and regulations, although the Company believes that the disclosures made are adequate to make the information not misleading. They have been prepared in accordance with accounting policies described in the Company’s Annual Report on Form 10-K for the fiscal year ended December 26, 2020 which should be read in conjunction with the disclosures therein. In the opinion of management, all adjustments considered necessary for a fair presentation have been included and are of a normal, recurring nature. Operating results for interim periods are not necessarily indicative of annual operating results.

Revenue Recognition

Revenue Recognition

Revenue Disaggregation

The following tables disaggregate the Company’s revenue by primary business units for the three and six months ended June 26, 2021 and June 27, 2020:

	Three Months Ended June 26, 2021								Six Months Ended June 26, 2021
(in thousands)	Electronics Segment		Automotive Segment		Industrial Segment		Total		Electronics Segment		Automotive Segment		Industrial Segment		Total
Electronics – Passive Products and Sensors	$	155,276	$	—	$	—	$	155,276	$	287,713	$	—	$	—	$	287,713
Electronics – Semiconductor	170,071		—		—		170,071		324,169		—		—		324,169
Passenger Car Products	—		68,048		—		68,048		—		135,949		—		135,949
Automotive Sensors	—		26,685		—		26,685		—		54,969		—		54,969
Commercial Vehicle Products	—		38,585		—		38,585		—		70,929		—		70,929
Industrial Products	—		—		64,823		64,823		—		—		113,553		113,553
Total	$	325,347	$	133,318	$	64,823	$	523,488	$	611,882	$	261,847	$	113,553	$	987,282

	Three Months Ended June 27, 2020								Six Months Ended June 27, 2020
(in thousands)	Electronics Segment		Automotive Segment		Industrial Segment		Total		Electronics Segment		Automotive Segment		Industrial Segment		Total
Electronics – Passive Products and Sensors	$	92,846	$	—	$	—	$	92,846	$	177,444	$	—	$	—	$	177,444
Electronics – Semiconductor	130,425		—		—		130,425		260,016		—		—		260,016
Passenger Car Products	—		30,309		—		30,309		—		82,954		—		82,954
Automotive Sensors	—		13,899		—		13,899		—		38,073		—		38,073
Commercial Vehicle Products	—		17,791		—		17,791		—		45,742		—		45,742
Industrial Products	—		—		22,067		22,067		—		—		49,204		49,204
Total	$	223,271	$	61,999	$	22,067	$	307,337	$	437,460	$	166,769	$	49,204	$	653,433

See Note 15, Segment Information for net sales by segment and countries.

Revenue Recognition

The Company recognizes revenue on product sales in the period in which the Company satisfies its performance obligation and control of the product is transferred to the customer. The Company’s sales arrangements with customers are predominately short term in nature and generally provide for transfer of control at the time of shipment as this is the point at which title and risk of loss of the product transfers to the customer. At the end of each period, for those shipments where title to the products and the risk of loss and rewards of ownership do not transfer until the product has been received by the customer, the Company adjusts revenues and cost of sales for the delay between the time that the products are shipped and when they are received by the customer. The amount of revenue recorded reflects the consideration to which the Company expects to be entitled in exchange for goods and may include adjustments for customer allowance, rebates and price adjustments. The Company’s distribution channels are primarily through direct sales and independent third-party distributors.

The Company elected the practical expedient under Accounting Standards Codification ("ASC") 340-40-25-4 to expense commissions when incurred as the amortization period of the commission asset the Company would have otherwise recognized is less than one year.

Revenue and Billing

The Company generally accepts orders from customers through receipt of purchase orders or electronic data interchange based on written sales agreements and purchasing contracts. Contract pricing and selling agreement terms are based on market factors, costs, and competition. Pricing is often negotiated as an adjustment (premium or discount) from the Company’s published price lists. The customer is invoiced when the Company’s products are shipped to them in accordance with the terms of the sales agreement. As the Company’s standard payment terms are less than one year, the Company elected the practical expedient under ASC 606-10-32-18 to not assess whether a contract has a significant financing component. The Company also elected the practical expedient provided in ASC 606-10-25-18B to treat all product shipping and handling activities as fulfillment activities, and therefore recognize the gross revenue associated with the contract, inclusive of any shipping and handling revenue.

Ship and Debit Program

Some of the terms of the Company’s sales agreements and normal business conditions provide customers (distributors) the ability to receive price adjustments on products previously shipped and invoiced. This practice is common in the industry and is referred to as a “ship and debit” program. This program allows the distributor to debit the Company for the difference between the distributors’ contracted price and a lower price for specific transactions. Under certain circumstances (usually in a competitive situation or large volume opportunity), a distributor will request authorization for pricing allowances to reduce its price. When the Company approves such a reduction, the distributor is authorized to “debit” its account for the difference between the contracted price and the lower approved price. The Company establishes reserves for this program based on historic activity, electronic distributor inventory levels and actual authorizations for the debit and recognizes these debits as a reduction of revenue.

Return to Stock 

The Company has a return to stock policy whereby certain customers, with prior authorization from Littelfuse management, can return previously purchased goods for full or partial credit. The Company establishes an estimated allowance for these returns based on historic activity. Sales revenue and cost of sales are reduced to anticipate estimated returns.

Volume Rebates

The Company offers volume based sales incentives to certain customers to encourage greater product sales. If customers achieve their specific quarterly or annual sales targets, they are entitled to rebates. The Company estimates the projected amount of rebates that will be achieved by the customer and recognizes this estimated cost as a reduction to revenue as products are sold.

Recently Adopted Accounting Standards

Recently Adopted Accounting Standards

In December 2019, the Financial Accounting Standards Board (FASB) issued Accounting Standard Update ("ASU") No. 2019-12, "Income Taxes (Topic 740) - Simplifying the Accounting for Income Taxes" as part of its initiative to reduce complexity in the accounting standards. The guidance is effective for fiscal years beginning after December 15, 2020 with early adoption permitted. The adoption of ASU 2019-12 did not have a material impact on our Condensed Consolidated Financial Statements.

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Summary of Significant Accounting Policies and Other Information (Tables)

6 Months Ended

Jun. 26, 2021

Accounting Policies [Abstract]

Schedule of revenue disaggregation

The following tables disaggregate the Company’s revenue by primary business units for the three and six months ended June 26, 2021 and June 27, 2020:

	Three Months Ended June 26, 2021								Six Months Ended June 26, 2021
(in thousands)	Electronics Segment		Automotive Segment		Industrial Segment		Total		Electronics Segment		Automotive Segment		Industrial Segment		Total
Electronics – Passive Products and Sensors	$	155,276	$	—	$	—	$	155,276	$	287,713	$	—	$	—	$	287,713
Electronics – Semiconductor	170,071		—		—		170,071		324,169		—		—		324,169
Passenger Car Products	—		68,048		—		68,048		—		135,949		—		135,949
Automotive Sensors	—		26,685		—		26,685		—		54,969		—		54,969
Commercial Vehicle Products	—		38,585		—		38,585		—		70,929		—		70,929
Industrial Products	—		—		64,823		64,823		—		—		113,553		113,553
Total	$	325,347	$	133,318	$	64,823	$	523,488	$	611,882	$	261,847	$	113,553	$	987,282

	Three Months Ended June 27, 2020								Six Months Ended June 27, 2020
(in thousands)	Electronics Segment		Automotive Segment		Industrial Segment		Total		Electronics Segment		Automotive Segment		Industrial Segment		Total
Electronics – Passive Products and Sensors	$	92,846	$	—	$	—	$	92,846	$	177,444	$	—	$	—	$	177,444
Electronics – Semiconductor	130,425		—		—		130,425		260,016		—		—		260,016
Passenger Car Products	—		30,309		—		30,309		—		82,954		—		82,954
Automotive Sensors	—		13,899		—		13,899		—		38,073		—		38,073
Commercial Vehicle Products	—		17,791		—		17,791		—		45,742		—		45,742
Industrial Products	—		—		22,067		22,067		—		—		49,204		49,204
Total	$	223,271	$	61,999	$	22,067	$	307,337	$	437,460	$	166,769	$	49,204	$	653,433

Schedule of cash and cash equivalents

The following table provides a reconciliation of cash, cash equivalents and restricted cash at June 26, 2021 and December 26, 2020 reported within the Condensed Consolidated Balance Sheets that sum to the total of the same such amounts shown in the Condensed Consolidated Statement of Cash Flows.

(in thousands)	June 26, 2021		December 26, 2020
Cash and cash equivalents	$	616,330	$	687,525
Restricted cash included in prepaid expenses and other current assets	3,790		—
Restricted cash included in other assets	1,734		$	—
Total cash, cash equivalents and restricted cash	$	621,854	$	687,525

Schedule of restricted cash and cash equivalents

The following table provides a reconciliation of cash, cash equivalents and restricted cash at June 26, 2021 and December 26, 2020 reported within the Condensed Consolidated Balance Sheets that sum to the total of the same such amounts shown in the Condensed Consolidated Statement of Cash Flows.

(in thousands)	June 26, 2021		December 26, 2020
Cash and cash equivalents	$	616,330	$	687,525
Restricted cash included in prepaid expenses and other current assets	3,790		—
Restricted cash included in other assets	1,734		$	—
Total cash, cash equivalents and restricted cash	$	621,854	$	687,525

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Acquisitions (Tables)

6 Months Ended

Jun. 26, 2021

Business Combination and Asset Acquisition [Abstract]

Schedule of recognized identified assets acquired and liabilities assumed

The following table summarizes the purchase price allocation of the fair value of assets acquired and liabilities assumed in the Hartland acquisition:

(in thousands)	Purchase Price Allocation
Total purchase consideration:
Cash, net of cash acquired, and restricted cash	$	109,852
Allocation of consideration to assets acquired and liabilities assumed:
Trade receivables, net	13,027
Inventories	35,808
Other current assets	2,224
Property, plant, and equipment	6,296
Intangible assets	39,660
Goodwill	40,442
Other non-current assets	3,787
Current liabilities	(24,846)
Other non-current liabilities	(6,546)
	$	109,852

Summary of business acquisition, pro forma information

The following table summarizes, on an unaudited pro forma basis, the combined results of operations of the Company and Hartland as though the acquisition had occurred as of December 29, 2019. The pro forma amounts presented are not necessarily indicative of either the actual consolidated results had the Hartland acquisition occurred as of December 29, 2019 or of future consolidated operating results.

	For the Three Months Ended				For the Six Months Ended
(in thousands, except per share amounts)	June 26, 2021		June 27, 2020		June 26, 2021		June 27, 2020
Net sales	$	523,488	$	323,713	$	994,320	$	687,330
Income (loss) before income taxes	98,644		(10,392)		175,939		21,039
Net income (loss)	84,818		(8,873)		146,143		12,565
Net income (loss) per share — basic	3.45		(0.36)		5.95		0.52
Net income (loss) per share — diluted	3.41		(0.36)		5.87		0.51

Summary of business acquisition, pro forma information, nonrecurring adjustments

Pro forma results presented above primarily reflect the following adjustments:

	For the Three Months Ended				For the Six Months Ended
(in thousands)	June 26, 2021		June 27, 2020		June 26, 2021		June 27, 2020
Amortization(a)	$	—	$	(837)	$	(280)	$	(1,676)
Depreciation	—		47		7		95
Transaction costs(b)	128		(128)		835		(835)
Amortization of inventory step-up(c)	3,319		(1,659)		6,808		(6,796)
Income tax (expense) benefit of above items	(724)		541		(1,555)		1,940

(a)The amortization adjustment for the three and six months ended June 27, 2020 primarily reflects incremental amortization resulting for the measurement of intangibles at their fair values.

(b)The transaction cost adjustments reflect the reversal of certain legal and professional fees from the three and six months ended June 26, 2021 and recognition of those fees during the three and six months ended June 27, 2020.

(c)The amortization of inventory step-up adjustment reflects the reversal of the amount recognized during the three and six months ended June 26, 2021 and the recognition of the amortization during the three and six months ended June 27, 2020. The inventory step-up was amortized over four months as the inventory was sold.

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Inventories (Tables)

6 Months Ended

Jun. 26, 2021

Inventory Disclosure [Abstract]

Schedule of inventory

The components of inventories at June 26, 2021 and December 26, 2020 are as follows:

(in thousands)	June 26, 2021		December 26, 2020
Raw materials	$	111,769	$	85,394
Work in process	106,552		92,783
Finished goods	142,777		114,641
Inventory Reserves	(35,324)		(34,816)
Total	$	325,774	$	258,002

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Property, Plant, and Equipment (Tables)

6 Months Ended

Jun. 26, 2021

Property, Plant and Equipment [Abstract]

Schedule of components of net property, plant, and equipment

The components of net property, plant, and equipment at June 26, 2021 and December 26, 2020 are as follows:

(in thousands)	June 26, 2021		December 26, 2020
Land	$	21,795	$	22,851
Building	128,528		123,497
Equipment	706,115		678,220
Accumulated depreciation and amortization	(503,612)		(480,390)
Total	$	352,826	$	344,178

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Goodwill and Other Intangible Assets (Tables)

6 Months Ended

Jun. 26, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of goodwill

The amounts for goodwill and changes in the carrying value by segment for the six months ended June 26, 2021 are as follows:

(in thousands)	Electronics		Automotive		Industrial		Total
Net book value of goodwill as of December 26, 2020
Gross goodwill as of December 26, 2020	$	676,325	$	138,354	$	47,551	$	862,230
Accumulated impairment losses as of December 26, 2020	—		(36,423)		(8,995)		(45,418)
Total	676,325		101,931		38,556		816,812
Changes during 2021:
Additions(a)	—		—		40,442		40,442
Currency translation	(4,779)		(1,542)		137		(6,184)
Net book value of goodwill as of June 26, 2021
Gross goodwill as of June 26, 2021	671,546		136,699		88,130		896,375
Accumulated impairment losses as of June 26, 2021	—		(36,310)		(8,995)		(45,305)
Total	$	671,546	$	100,389	$	79,135	$	851,070

(a) The additions resulted from the acquisition of Hartland.

Schedule of finite-lived intangible assets

The components of other intangible assets as of June 26, 2021 and December 26, 2020 are as follows:

	As of June 26, 2021
(in thousands)	Gross Carrying Value		Accumulated Amortization		Net Book Value
Land use rights	$	10,392	$	2,177	$	8,215
Patents, licenses and software	143,717		97,977		45,740
Distribution network	43,762		39,941		3,821
Customer relationships, trademarks, and tradenames	401,722		151,727		249,995
Total	$	599,593	$	291,822	$	307,771

	As of December 26, 2020
(in thousands)	Gross Carrying Value		Accumulated Amortization		Net Book Value
Land use rights	$	10,280	$	2,007	$	8,273
Patents, licenses and software	137,210		92,868		44,342
Distribution network	43,910		38,980		4,930
Customer relationships, trademarks, and tradenames	372,064		137,722		234,342
Total	$	563,464	$	271,577	$	291,887

During the six months ended June 26, 2021, the Company recorded additions to intangible assets of $39.7 million, related to the Hartland acquisition, the components of which were as follows:

(in thousands)	Weighted Average Useful Life	Amount
Patents, licenses and software	9.2	$	7,559
Customer relationships, trademarks, and tradenames	13.7	32,101
Total		$	39,660

Schedule of finite-lived intangible assets, future amortization expense

Estimated annual amortization expense related to intangible assets with definite lives as of June 26, 2021 is as follows:

(in thousands)	Amount
2021	$	41,868
2022	40,877
2023	36,569
2024	33,135
2025	32,682
2026 and thereafter	143,802
Total	$	328,933

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Accrued Liabilities (Tables)

6 Months Ended

Jun. 26, 2021

Payables and Accruals [Abstract]

Schedule of components of accrued liabilities

The components of accrued liabilities as of June 26, 2021 and December 26, 2020 are as follows:

(in thousands)	June 26, 2021		December 26, 2020
Employee-related liabilities	$	64,909	$	50,689
Operating lease liability	8,853		6,811
Other non-income taxes	8,815		2,126
Interest	4,506		4,517
Professional services	2,962		3,321
Deferred revenue	2,444		2,959
Restructuring liability	1,109		4,195
Customer liability	790		3,858
Other	32,057		32,002
Total	$	126,445	$	110,478

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Restructuring, Impairment and Other Charges (Tables)

6 Months Ended

Jun. 26, 2021

Restructuring and Related Activities [Abstract]

Schedule of restructuring, impairment and other charges

The Company recorded restructuring, impairment and other charges for the three and six months ended June 26, 2021 and June 27, 2020 as follows:

	Three months ended June 26, 2021								Six months ended June 26, 2021
(in thousands)	Electronics		Automotive		Industrial		Total		Electronics		Automotive		Industrial		Total
Employee terminations	$	295	$	416	$	6	$	717	$	552	$	416	$	169	$	1,137
Other restructuring charges	—		72		—		72		—		89		—		89
Total restructuring charges	295		488		6		789		552		505		169		1,226
Total	$	295	$	488	$	6	$	789	$	552	$	505	$	169	$	1,226

	Three months ended June 27, 2020								Six months ended June 27, 2020
(in thousands)	Electronics		Automotive		Industrial		Total		Electronics		Automotive		Industrial		Total
Employee terminations	$	856	$	209	$	750	$	1,815	$	1,737	$	608	$	1,071	$	3,416
Other restructuring charges	(1)		(12)		22		9		—		108		25		133
Total restructuring charges	855		197		772		1,824		1,737		716		1,096		3,549
Impairment	—		33,841		—		33,841		—		33,841		2,237		36,078
Total	$	855	$	34,038	$	772	$	35,665	$	1,737	$	34,557	$	3,333	$	39,627

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Debt (Tables)

6 Months Ended

Jun. 26, 2021

Debt Disclosure [Abstract]

Schedule of long-term debt instruments

The carrying amounts of debt at June 26, 2021 and December 26, 2020 are as follows:

(in thousands)	June 26, 2021		December 26, 2020
Revolving Credit Facility	$	100,000	$	130,000
Euro Senior Notes, Series A due 2023	139,610		142,679
Euro Senior Notes, Series B due 2028	113,359		115,850
U.S. Senior Notes, Series A due 2022	25,000		25,000
U.S. Senior Notes, Series B due 2027	100,000		100,000
U.S. Senior Notes, Series A due 2025	50,000		50,000
U.S. Senior Notes, Series B due 2030	125,000		125,000
Other	2,619		2,619
Unamortized debt issuance costs	(3,671)		(4,114)
Total debt	651,917		687,034
Less: Current maturities	(25,000)		—
Total long-term debt	$	626,917	$	687,034

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Fair Value of Assets and Liabilities (Tables)

6 Months Ended

Jun. 26, 2021

Fair Value Disclosures [Abstract]

Schedule of fair value, assets measured on recurring basis

The following table presents assets measured at fair value by classification within the fair value hierarchy as of June 26, 2021:

	Fair Value Measurements Using
(in thousands)	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Cash equivalents	$	25,768	$	—	$	—	$	25,768
Investments in equity securities	27,532		—		—		27,532
Mutual funds	14,545		—		—		14,545
Total	$	67,845	$	—	$	—	$	67,845

The following table presents assets measured at fair value by classification within the fair value hierarchy as of December 26, 2020: 

	Fair Value Measurements Using
(in thousands)	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Cash equivalents	$	73,461	$	—	$	—	$	73,461
Investments in equity securities	19,186		—		—		19,186
Mutual funds	13,249		—		—		13,249
Total	$	105,896	$	—	$	—	$	105,896

Schedule of fair value, by balance sheet grouping

The carrying value and estimated fair values of the Company’s Euro Senior Notes, Series A and Series B and USD Senior Notes, Series A and Series B, as of June 26, 2021 and December 26, 2020 were as follows:

	June 26, 2021				December 26, 2020
(in thousands)	Carrying Value		Estimated Fair Value		Carrying Value		Estimated Fair Value
Euro Senior Notes, Series A due 2023	$	139,610	$	141,709	$	142,679	$	144,323
Euro Senior Notes, Series B due 2028	113,359		119,481		115,850		123,588
USD Senior Notes, Series A due 2022	25,000		25,284		25,000		25,437
USD Senior Notes, Series B due 2027	100,000		107,293		100,000		109,552
USD Senior Notes, Series A due 2025	50,000		52,845		50,000		53,474
USD Senior Notes, Series B due 2030	125,000		134,145		125,000		138,036

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Benefit Plans (Tables)

6 Months Ended

Jun. 26, 2021

Retirement Benefits [Abstract]

Schedule of net benefit costs

The components of net periodic benefit cost for the three and six months ended June 26, 2021 and June 27, 2020 were as follows: 

	For the Three Months Ended				For the Six Months Ended
(in thousands)	June 26, 2021		June 27, 2020		June 26, 2021		June 27, 2020
Components of net periodic benefit cost:
Service cost	$	700	$	592	$	1,402	$	1,210
Interest cost	443		486		883		1,144
Expected return on plan assets	(371)		(402)		(738)		(1,129)
Amortization of prior service and net actuarial loss	334		264		665		409
Net periodic benefit cost	$	1,106	$	940	$	2,212	$	1,634

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Other Comprehensive Income (Loss) (Tables)

6 Months Ended

Jun. 26, 2021

Equity [Abstract]

Schedule of components of comprehensive income (loss)

Changes in other comprehensive income (loss) by component were as follows:

(in thousands)	Three Months Ended June 26, 2021						Three Months Ended June 27, 2020
	Pre-tax		Tax		Net of Tax		Pre-tax		Tax		Net of Tax
Defined benefit pension plan and other adjustments	$	372	$	43	$	329	$	(13,098)	$	(2,259)	$	(10,839)
Foreign currency translation adjustments	5,125		—		5,125		8,422		—		8,422
Total change in other comprehensive income (loss)	$	5,497	$	43	$	5,454	$	(4,676)	$	(2,259)	$	(2,417)
(in thousands)	Six Months Ended June 26, 2021						Six Months Ended June 27, 2020
	Pre-tax		Tax		Net of Tax		Pre-tax		Tax		Net of Tax
Defined benefit pension plan adjustments	$	878	$	95	$	783	(12,543)		(2,265)		$	(10,278)
Foreign currency translation adjustments	(200)		—		(200)		$	(7,118)	$	—	$	(7,118)
Total change in other comprehensive income (loss)	$	678	$	95	$	583	$	(19,661)	$	(2,265)	$	(17,396)

Schedule of accumulated other comprehensive income (loss)

The following tables set forth the changes in accumulated other comprehensive (loss) by component for the six months ended June 26, 2021 and June 27, 2020:

(in thousands)	Defined benefit pension plan and other adjustments		Foreign currency translation adjustment		Accumulated other comprehensive (loss)
Balance at December 26, 2020	$	(34,141)	$	(57,016)	$	(91,157)
Activity in the period	783		(200)		583
Balance at June 26, 2021	$	(33,358)	$	(57,216)	$	(90,574)

(in thousands)	Defined benefit pension plan and other adjustments		Foreign currency translation adjustment		Accumulated other comprehensive (loss)
Balance at December 28, 2019	$	(18,046)	$	(88,777)	$	(106,823)
Activity in the period	(10,278)		(7,118)		(17,396)
Balance at June 27, 2020	$	(28,324)	$	(95,895)	$	(124,219)

Summary of reclassification out of accumulated other comprehensive income

Amounts reclassified from accumulated other comprehensive (loss) to earnings for the three and six months ended June 26, 2021 and June 27, 2020 were as follows:

	Three Months Ended				Six Months Ended
(in thousands)	June 26, 2021		June 27, 2020		June 26, 2021		June 27, 2020
Pension and Postemployment plans:
Amortization of prior service and net actuarial loss	$	509	$	429	$	1,013	$	774

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Earnings (loss) Per Share (Tables)

6 Months Ended

Jun. 26, 2021

Earnings Per Share [Abstract]

Schedule of earnings per share, basic and diluted

The following table sets forth the computation of basic and diluted earnings per share: 

	Three Months Ended				Six Months Ended
(in thousands, except per share amounts)	June 26, 2021		June 27, 2020		June 26, 2021		June 27, 2020
Numerator:
Net income (loss) as reported	$	82,095	$	(8,991)	$	139,808	$	15,653
Denominator:
Weighted average shares outstanding
Basic	24,592		24,312		24,562		24,353
Effect of dilutive securities	308		—		332		167
Diluted	24,900		24,312		24,894		24,520
Earnings (loss) Per Share:
Basic earnings (loss) per share	$	3.34	$	(0.37)	$	5.69	$	0.64
Diluted earnings (loss) per share	$	3.30	$	(0.37)	$	5.62	$	0.64

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Related Party Transactions (Tables)

6 Months Ended

Jun. 26, 2021

Related Party Transactions [Abstract]

Schedule of related party transactions

	For the Three Months Ended June 26, 2021						For the Three Months Ended June 27, 2020
(in millions)	Powersem		EB Tech		ATEC		Powersem		EB Tech		ATEC
Sales to related party	$	—	$	—	$	—	$	0.3	$	—	$	—
Purchase material/service from related party	0.7		0.1		2.8		0.8		—		1.6
	For the Six Months Ended June 26, 2021						For the Six Months Ended June 27, 2020
(in millions)	Powersem		EB Tech		ATEC		Powersem		EB Tech		ATEC
Sales to related party	$	0.2	$	—	$	—	$	0.7	$	—	$	—
Purchase material/service from related party	1.8		0.2		5.8		1.0		—		3.4
	June 26, 2021						December 26, 2020
(in millions)	Powersem		EB Tech		ATEC		Powersem		EB Tech		ATEC
Accounts receivable balance	$	—	$	—	$	—	$	0.1	$	—	$	—
Accounts payable balance	0.1		—		1.8		0.1		—		0.2

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Segment Information (Tables)

6 Months Ended

Jun. 26, 2021

Segment Reporting [Abstract]

Schedule of segment reporting information, by segment

Segment information is summarized as follows: 

	Three Months Ended				Six Months Ended
(in thousands)	June 26, 2021		June 27, 2020		June 26, 2021		June 27, 2020
Net sales
Electronics	$	325,347	$	223,271	$	611,882	$	437,460
Automotive	133,318		61,999		261,847		166,769
Industrial	64,823		22,067		113,553		49,204
Total net sales	$	523,488	$	307,337	$	987,282	$	653,433
Depreciation and amortization
Electronics	$	15,114	$	15,617	$	30,495	31,148
Automotive	6,946		7,071		14,019		14,258
Industrial	2,155		1,046		3,899		2,130
Total depreciation and amortization	$	24,215	$	23,734	$	48,413	$	47,536
Operating income (loss)
Electronics	$	74,236	$	32,651	$	129,759	$	64,923
Automotive	19,258		(8,857)		39,574		5,259
Industrial	8,375		(23)		11,881		3,511
Other(a)	(5,612)		(35,721)		(8,476)		(40,893)
Total operating income (loss)	96,257		(11,950)		172,738		32,800
Interest expense	4,626		5,855		9,299		11,273
Foreign exchange (gain) loss	(1,676)		(6,010)		5,161		(3,426)
Other (income) expense, net	(1,890)		(1,210)		(9,627)		39
Income (loss) before income taxes	$	95,197	$	(10,585)	$	167,905	$	24,914

(a) Included in “Other” Operating income for the second quarter of 2021 was $3.3 million ($6.8 million year-to-date) of purchase accounting inventory step-up charges, $0.5 million ($1.3 million year-to-date) of legal and professional fees and other integration expenses related to Hartland and other contemplated acquisitions, and $0.8 million ($1.3 million year-to-date) of restructuring, impairment and other charges, primarily related to employee termination costs. See Note 7, Restructuring, Impairment, and Other Charges, for further discussion. In addition, there was a loss of $1.0 million recorded during the second quarter of 2021 for a total year-to-date gain of $0.9 million from the sale of a building within the Electronics segment.

Schedule of disclosure on geographic areas, long-lived assets in individual foreign countries by country

The Company’s net sales by country were as follows: 

	Three Months Ended				Six Months Ended
(in thousands)	June 26, 2021		June 27, 2020		June 26, 2021		June 27, 2020
Net sales
United States	$	154,797	$	76,870	$	285,728	$	179,780
China	156,086		102,026		295,244		188,041
Other countries(a)	212,605		128,441		406,310		285,612
Total net sales	$	523,488	$	307,337	$	987,282	$	653,433

 The Company’s long-lived assets by country were as follows:

(in thousands)	June 26, 2021		December 26, 2020
Long-lived assets
United States	$	47,509	$	46,132
China	87,497		85,876
Mexico	76,700		70,125
Germany	37,447		37,976
Philippines	69,308		66,994
Other countries(a)	34,365		37,075
Total long-lived assets	$	352,826	$	344,178

The Company’s additions to long-lived assets by country were as follows:

	Six Months Ended
(in thousands)	June 26, 2021		June 27, 2020
Additions to long-lived assets
United States	$	1,732	$	2,026
China	7,127		4,516
Mexico	13,231		4,260
Germany	2,533		2,509
Philippines	6,941		9,039
Other countries(a)	1,793		687
Total additions to long-lived assets	$	33,357	$	23,037

(a)Each country included in other countries is less than 10% of net sales.

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Summary of Significant Accounting Policies and Other Information (Details) customer in Thousands, associate in Thousands	6 Months Ended
	Jun. 26, 2021 country customer associate
Accounting Policies [Abstract]
Countries where product is used (country) | country	15
Global associates (associate) | associate	12
Number of customers (over) | customer	100

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Summary of Significant Accounting Policies and Other Information - Revenue Disaggregation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 26, 2021	Jun. 27, 2020	Jun. 26, 2021	Jun. 27, 2020
Disaggregation of Revenue
Net sales	$ 523,488	$ 307,337	$ 987,282	$ 653,433
Electronics – Passive Products and Sensors
Disaggregation of Revenue
Net sales	155,276	92,846	287,713	177,444
Electronics – Semiconductor
Disaggregation of Revenue
Net sales	170,071	130,425	324,169	260,016
Passenger Car Products
Disaggregation of Revenue
Net sales	68,048	30,309	135,949	82,954
Automotive Sensors
Disaggregation of Revenue
Net sales	26,685	13,899	54,969	38,073
Commercial Vehicle Products
Disaggregation of Revenue
Net sales	38,585	17,791	70,929	45,742
Industrial Products
Disaggregation of Revenue
Net sales	64,823	22,067	113,553	49,204
Electronics Segment
Disaggregation of Revenue
Net sales	325,347	223,271	611,882	437,460
Electronics Segment | Electronics – Passive Products and Sensors
Disaggregation of Revenue
Net sales	155,276	92,846	287,713	177,444
Electronics Segment | Electronics – Semiconductor
Disaggregation of Revenue
Net sales	170,071	130,425	324,169	260,016
Electronics Segment | Passenger Car Products
Disaggregation of Revenue
Net sales	0	0	0	0
Electronics Segment | Automotive Sensors
Disaggregation of Revenue
Net sales	0	0	0	0
Electronics Segment | Commercial Vehicle Products
Disaggregation of Revenue
Net sales	0	0	0	0
Electronics Segment | Industrial Products
Disaggregation of Revenue
Net sales	0	0	0	0
Automotive Segment
Disaggregation of Revenue
Net sales	133,318	61,999	261,847	166,769
Automotive Segment | Electronics – Passive Products and Sensors
Disaggregation of Revenue
Net sales	0	0	0	0
Automotive Segment | Electronics – Semiconductor
Disaggregation of Revenue
Net sales	0	0	0	0
Automotive Segment | Passenger Car Products
Disaggregation of Revenue
Net sales	68,048	30,309	135,949	82,954
Automotive Segment | Automotive Sensors
Disaggregation of Revenue
Net sales	26,685	13,899	54,969	38,073
Automotive Segment | Commercial Vehicle Products
Disaggregation of Revenue
Net sales	38,585	17,791	70,929	45,742
Automotive Segment | Industrial Products
Disaggregation of Revenue
Net sales	0	0	0	0
Industrial Segment
Disaggregation of Revenue
Net sales	64,823	22,067	113,553	49,204
Industrial Segment | Electronics – Passive Products and Sensors
Disaggregation of Revenue
Net sales	0	0	0	0
Industrial Segment | Electronics – Semiconductor
Disaggregation of Revenue
Net sales	0	0	0	0
Industrial Segment | Passenger Car Products
Disaggregation of Revenue
Net sales	0	0	0	0
Industrial Segment | Automotive Sensors
Disaggregation of Revenue
Net sales	0	0	0	0
Industrial Segment | Commercial Vehicle Products
Disaggregation of Revenue
Net sales	0	0	0	0
Industrial Segment | Industrial Products
Disaggregation of Revenue
Net sales	$ 64,823	$ 22,067	$ 113,553	$ 49,204

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Summary of Significant Accounting Policies and Other Information - Cash and cash equivalents (Details) - USD ($) $ in Thousands	Jun. 26, 2021	Dec. 26, 2020	Jun. 27, 2020	Dec. 28, 2019
Accounting Policies [Abstract]
Cash and cash equivalents	$ 616,330	$ 687,525	$ 651,867
Restricted cash included in prepaid expenses and other current assets	3,790	0	0
Restricted cash included in other assets	1,734	0	0
Total cash, cash equivalents and restricted cash	$ 621,854	$ 687,525	$ 651,867	$ 531,139

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Acquisitions - Narrative (Details) - USD ($) $ in Thousands		3 Months Ended	6 Months Ended
	Jan. 28, 2021	Jun. 26, 2021	Jun. 26, 2021	Jun. 27, 2020
Business Acquisition
Cash, net of cash acquired, and restricted cash			$ 109,852	$ 0
Restricted cash		$ 1,700	1,700
Acquisition related costs		100	$ 800
Inventory amortization period (in years)			4 months
Hartland Controls
Business Acquisition
Annualized sales	$ 70,000
Hartland Controls
Business Acquisition
Cash acquired from acquisition	112,300
Cash, net of cash acquired, and restricted cash	109,852
Measurement period adjustments increased goodwill		1,500
Trade receivables adjustment		1,300
Inventory adjustment	$ (6,800)	500
Current liabilities adjustment		300
Net sales		26,400	$ 43,100
Income (loss) before income taxes		(300)	(2,500)
Hartland Controls | Corporate Non-Segment | Operating Income (Loss)
Business Acquisition
Inventory adjustment		$ (3,300)	$ (6,800)

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Acquisitions - Preliminary Price Allocation (Details) - USD ($) $ in Thousands		6 Months Ended
	Jan. 28, 2021	Jun. 26, 2021	Jun. 27, 2020	Dec. 26, 2020
Total purchase consideration:
Cash, net of cash acquired, and restricted cash		$ 109,852	$ 0
Allocation of consideration to assets acquired and liabilities assumed:
Goodwill		$ 851,070		$ 816,812
Hartland Controls
Total purchase consideration:
Cash, net of cash acquired, and restricted cash	$ 109,852
Allocation of consideration to assets acquired and liabilities assumed:
Trade receivables, net	13,027
Inventories	35,808
Other current assets	2,224
Property, plant, and equipment	6,296
Intangible assets	39,660
Goodwill	40,442
Other non-current assets	3,787
Current liabilities	(24,846)
Other non-current liabilities	(6,546)
Assets acquired and liabilities assumed	$ 109,852

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Acquisitions - Business Acquisition Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 26, 2021	Jun. 27, 2020	Jun. 26, 2021	Jun. 27, 2020
Business Combination and Asset Acquisition [Abstract]
Net sales	$ 523,488	$ 323,713	$ 994,320	$ 687,330
Income (loss) before income taxes	98,644	(10,392)	175,939	21,039
Net income (loss)	$ 84,818	$ (8,873)	$ 146,143	$ 12,565
Net income (loss) per share — basic (in dollars per share)	$ 3.45	$ (0.36)	$ 5.95	$ 0.52
Net income (loss) per share — diluted (in dollars per share)	$ 3.41	$ (0.36)	$ 5.87	$ 0.51

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Acquisitions - Pro Forma Information Adjustments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 26, 2021	Jun. 27, 2020	Jun. 26, 2021	Jun. 27, 2020
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment
Net income (loss)	$ 84,818	$ (8,873)	$ 146,143	$ 12,565
Amortization
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment
Net income (loss)	0	(837)	(280)	(1,676)
Depreciation
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment
Net income (loss)	0	47	7	95
Transaction costs
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment
Net income (loss)	128	(128)	835	(835)
Amortization of inventory step-up
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment
Net income (loss)	3,319	(1,659)	6,808	(6,796)
Income tax (expense) benefit of above items
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment
Net income (loss)	$ (724)	$ 541	$ (1,555)	$ 1,940

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Inventories - Components of Inventories (Details) - USD ($) $ in Thousands	Jun. 26, 2021	Dec. 26, 2020
Inventory Disclosure [Abstract]
Raw materials	$ 111,769	$ 85,394
Work in process	106,552	92,783
Finished goods	142,777	114,641
Inventory Reserves	(35,324)	(34,816)
Total	$ 325,774	$ 258,002

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Property, Plant, and Equipment (Details) - USD ($) $ in Thousands	Jun. 26, 2021	Dec. 26, 2020
Property, Plant and Equipment
Accumulated depreciation and amortization	$ (503,612)	$ (480,390)
Total	352,826	344,178
Land
Property, Plant and Equipment
Property, plant, and equipment, gross	21,795	22,851
Building
Property, Plant and Equipment
Property, plant, and equipment, gross	128,528	123,497
Equipment
Property, Plant and Equipment
Property, plant, and equipment, gross	$ 706,115	$ 678,220

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Property, Plant, and Equipment - Depreciation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 26, 2021	Jun. 27, 2020	Jun. 26, 2021	Jun. 27, 2020
Property, Plant and Equipment [Abstract]
Depreciation	$ 13,600	$ 13,900	$ 27,251	$ 27,728

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Goodwill and Other Intangible Assets - Amounts for Goodwill and Changes in Carrying Value by Operating Segment (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 26, 2021	Dec. 26, 2020
Goodwill
Gross goodwill	$ 896,375	$ 862,230
Accumulated impairment losses	(45,305)	(45,418)
Net goodwill	851,070	816,812
Additions	40,442
Currency translation	(6,184)
Electronics
Goodwill
Gross goodwill	671,546	676,325
Accumulated impairment losses	0	0
Net goodwill	671,546	676,325
Additions	0
Currency translation	(4,779)
Automotive
Goodwill
Gross goodwill	136,699	138,354
Accumulated impairment losses	(36,310)	(36,423)
Net goodwill	100,389	101,931
Additions	0
Currency translation	(1,542)
Industrial
Goodwill
Gross goodwill	88,130	47,551
Accumulated impairment losses	(8,995)	(8,995)
Net goodwill	79,135	$ 38,556
Additions	40,442
Currency translation	$ 137

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Goodwill and Other Intangible Assets - Details of Other Intangible Assets and Related Future Amortization Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 27, 2021	Jun. 26, 2021	Dec. 26, 2020
Finite-Lived Intangible Assets
Gross Carrying Value		$ 599,593	$ 563,464
Accumulated Amortization		291,822	271,577
Net Book Value		307,771	291,887
Amount	$ 39,660
Land use rights
Finite-Lived Intangible Assets
Gross Carrying Value		10,392	10,280
Accumulated Amortization		2,177	2,007
Net Book Value		8,215	8,273
Patents, licenses and software
Finite-Lived Intangible Assets
Gross Carrying Value		143,717	137,210
Accumulated Amortization		97,977	92,868
Net Book Value		45,740	44,342
Weighted Average Useful Life	9 years 2 months 12 days
Amount	$ 7,559
Distribution network
Finite-Lived Intangible Assets
Gross Carrying Value		43,762	43,910
Accumulated Amortization		39,941	38,980
Net Book Value		3,821	4,930
Customer relationships, trademarks, and tradenames
Finite-Lived Intangible Assets
Gross Carrying Value		401,722	372,064
Accumulated Amortization		151,727	137,722
Net Book Value		$ 249,995	$ 234,342
Weighted Average Useful Life	13 years 8 months 12 days
Amount	$ 32,101

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Goodwill and Other Intangible Assets - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 26, 2021	Jun. 27, 2020	Mar. 28, 2020	Jun. 26, 2021	Jun. 27, 2020	Jan. 28, 2021	Dec. 26, 2020
Goodwill
Goodwill	$ 851,070			$ 851,070			$ 816,812
Amortization of intangibles	10,641	$ 9,827		21,162	$ 19,808
Impairment of intangibles			$ 300
Acquired finite lived intangibles				40,442
Automotive Sensors
Goodwill
Goodwill impairment charge		$ 33,800
Goodwill	$ 9,600			9,600
Hartland Controls
Goodwill
Goodwill						$ 40,442
Acquired finite lived intangibles				$ 39,700

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Goodwill and Other Intangible Assets - Estimated Amortization Expense Related to Intangible Assets with Definite Lives (Details) $ in Thousands	Jun. 26, 2021 USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity
2021	$ 41,868
2022	40,877
2023	36,569
2024	33,135
2025	32,682
2026 and thereafter	143,802
Total	$ 328,933

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Accrued Liabilities (Details) - USD ($) $ in Thousands	Jun. 26, 2021	Dec. 26, 2020
Payables and Accruals [Abstract]
Employee-related liabilities	$ 64,909	$ 50,689
Operating lease liability	8,853	6,811
Other non-income taxes	8,815	2,126
Interest	4,506	4,517
Professional services	2,962	3,321
Deferred revenue	2,444	2,959
Restructuring liability	1,109	4,195
Customer liability	790	3,858
Other	32,057	32,002
Total	$ 126,445	$ 110,478

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Restructuring, Impairment and Other Charges (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 26, 2021	Jun. 27, 2020	Jun. 26, 2021	Jun. 27, 2020	Dec. 26, 2020
Restructuring Cost and Reserve
Total restructuring charges	$ 789	$ 1,824	$ 1,226	$ 3,549
Impairment charges		33,841	0	36,078
Restructuring costs	789	35,665	1,226	39,627
Restructuring reserves	2,900		2,900		$ 4,200
Restructuring liability	1,109		1,109		$ 4,195
Other long term liabilities	1,800		1,800
Employee terminations
Restructuring Cost and Reserve
Total restructuring charges	717	1,815	1,137	3,416
Other restructuring charges
Restructuring Cost and Reserve
Total restructuring charges	72	9	89	133
Electronics
Restructuring Cost and Reserve
Total restructuring charges	295	855	552	1,737
Impairment charges		0		0
Restructuring costs	295	855	552	1,737
Electronics | Employee terminations
Restructuring Cost and Reserve
Total restructuring charges	295	856	552	1,737
Electronics | Other restructuring charges
Restructuring Cost and Reserve
Total restructuring charges	0	(1)	0	0
Automotive
Restructuring Cost and Reserve
Total restructuring charges	488	197	505	716
Impairment charges		33,841		33,841
Restructuring costs	488	34,038	505	34,557
Automotive | Employee terminations
Restructuring Cost and Reserve
Total restructuring charges	416	209	416	608
Automotive | Other restructuring charges
Restructuring Cost and Reserve
Total restructuring charges	72	(12)	89	108
Automotive | Facility Closing
Restructuring Cost and Reserve
Goodwill impairment charge		33,800
Industrial
Restructuring Cost and Reserve
Total restructuring charges	6	772	169	1,096
Impairment charges		0		2,237
Restructuring costs	6	772	169	3,333
Industrial | Employee terminations
Restructuring Cost and Reserve
Total restructuring charges	6	750	169	1,071
Industrial | Other restructuring charges
Restructuring Cost and Reserve
Total restructuring charges	$ 0	22	$ 0	$ 25
Industrial | Facility Closing
Restructuring Cost and Reserve
Impairment charges		$ 2,200

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Debt - Carrying Amounts of Long-term Debt (Details) - USD ($) $ in Thousands	Jun. 26, 2021	Dec. 26, 2020
Debt Instrument
Unamortized debt issuance costs	$ (3,671)	$ (4,114)
Total debt	651,917	687,034
Less: Current maturities	(25,000)	0
Total long-term debt	626,917	687,034
Revolving Credit Facility
Debt Instrument
Long-term debt, gross	100,000	130,000
Senior Notes | Euro Senior Notes, Series A due 2023
Debt Instrument
Long-term debt, gross	139,610	142,679
Senior Notes | Euro Senior Notes, Series B due 2028
Debt Instrument
Long-term debt, gross	113,359	115,850
Senior Notes | U.S. Senior Notes, Series A due 2022
Debt Instrument
Long-term debt, gross	25,000	25,000
Senior Notes | U.S. Senior Notes, Series B due 2027
Debt Instrument
Long-term debt, gross	100,000	100,000
Senior Notes | U.S. Senior Notes, Series A due 2025
Debt Instrument
Long-term debt, gross	50,000	50,000
Senior Notes | U.S. Senior Notes, Series B due 2030
Debt Instrument
Long-term debt, gross	125,000	125,000
Other
Debt Instrument
Long-term debt, gross	$ 2,619	$ 2,619

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Debt - Narrative (Details)		3 Months Ended		6 Months Ended
	Apr. 03, 2020 USD ($)	Jun. 26, 2021 USD ($)	Jun. 27, 2020 USD ($)	Jun. 26, 2021 USD ($)	Jun. 27, 2020 USD ($)	Dec. 26, 2020 USD ($)	Apr. 02, 2020 USD ($)	Jan. 16, 2018 USD ($)	Nov. 15, 2017 USD ($) series	Feb. 15, 2017 USD ($)	Dec. 08, 2016 USD ($) series	Dec. 08, 2016 EUR (€) series
Debt Instrument
Payments of revolving credit facility				$ 30,000,000	$ 0
Cash paid during the period for interest		$ 2,500,000	$ 3,400,000	$ 8,719,000	$ 10,799,000
Credit Agreement
Debt Instrument
Effective interest rate (percent)		1.59%		1.59%
Letter of credit outstanding (less than)		$ 0		$ 0
Credit Agreement | Minimum
Debt Instrument
Commitment fee (percent)				0.125%
Credit Agreement | Maximum
Debt Instrument
Commitment fee (percent)				0.20%
Credit Agreement | LIBOR | Minimum
Debt Instrument
Basis spread on variable rate (percent)				1.25%
Credit Agreement | LIBOR | Maximum
Debt Instrument
Basis spread on variable rate (percent)				2.00%
Credit Agreement | Base Rate | Minimum
Debt Instrument
Basis spread on variable rate (percent)				0.25%
Credit Agreement | Base Rate | Maximum
Debt Instrument
Basis spread on variable rate (percent)				1.00%
Credit Agreement | Revolving Credit Facility
Debt Instrument
Remaining borrowing capacity		600,000,000.0		$ 600,000,000.0
Term Loan
Debt Instrument
Elimination of unsecured team loan facility	$ 200,000,000.0
Long-term debt, gross							$ 140,000,000.0
Senior Notes | Euro Senior Notes, Series A and B
Debt Instrument
Face amount of debt | €												€ 212,000,000
Number of series | series											2	2
Senior Notes | Euro Senior Notes, Series A due 2023
Debt Instrument
Long-term debt, gross		139,610,000		139,610,000		$ 142,679,000
Face amount of debt | €												€ 117,000,000
Stated interest rate (percent)											1.14%	1.14%
Senior Notes | Euro Senior Notes, Series B due 2028
Debt Instrument
Long-term debt, gross		113,359,000		113,359,000		115,850,000
Face amount of debt | €												€ 95,000,000
Stated interest rate (percent)											1.83%	1.83%
Senior Notes | U.S. Senior Notes, Series A and B
Debt Instrument
Face amount of debt											$ 125,000,000
Number of series | series											2	2
Senior Notes | U.S. Senior Notes, Series A
Debt Instrument
Face amount of debt										$ 25,000,000
Stated interest rate (percent)										3.03%
Senior Notes | U.S. Senior Notes, Series B
Debt Instrument
Face amount of debt										$ 100,000,000
Stated interest rate (percent)										3.74%
Senior Notes | US Senior Notes A and B Due 2025 and 2030
Debt Instrument
Face amount of debt									$ 175,000,000
Number of series | series									2
Senior Notes | U.S. Senior Notes, Series A due 2025
Debt Instrument
Long-term debt, gross		50,000,000		50,000,000		50,000,000
Face amount of debt								$ 50,000,000
Stated interest rate (percent)								3.48%
Senior Notes | U.S. Senior Notes, Series B due 2030
Debt Instrument
Long-term debt, gross		$ 125,000,000		$ 125,000,000		$ 125,000,000
Face amount of debt								$ 125,000,000
Stated interest rate (percent)								3.78%

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Fair Value of Assets and Liabilities - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 26, 2021	Mar. 28, 2020	Jun. 26, 2021	Dec. 26, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Impairment of investments	$ 500		$ 500
Investments in equity securities	$ 27,532		$ 27,532	$ 19,186
Patents
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Other asset impairment charges		$ 300
Land and Building
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Other asset impairment charges		$ 1,900
Other Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Investments in equity securities				$ 500

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Fair Value of Assets and Liabilities - Assets Measured at Fair Value (Details) - USD ($) $ in Thousands	Jun. 26, 2021	Dec. 26, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	$ 25,768	$ 73,461
Investments in equity securities	27,532	19,186
Mutual funds	14,545	13,249
Total	67,845	105,896
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	25,768	73,461
Investments in equity securities	27,532	19,186
Mutual funds	14,545	13,249
Total	67,845	105,896
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	0	0
Investments in equity securities	0	0
Mutual funds	0	0
Total	0	0
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash equivalents	0	0
Investments in equity securities	0	0
Mutual funds	0	0
Total	$ 0	$ 0

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Fair Value of Assets and Liabilities - Carrying Value and Estimated Fair Value of Senior Notes (Details) - Senior Notes - USD ($) $ in Thousands	Jun. 26, 2021	Dec. 26, 2020
Carrying Value | Euro Senior Notes, Series A due 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Long-term debt fair value	$ 139,610	$ 142,679
Carrying Value | Euro Senior Notes, Series B due 2028
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Long-term debt fair value	113,359	115,850
Carrying Value | U.S. Senior Notes, Series A due 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Long-term debt fair value	25,000	25,000
Carrying Value | U.S. Senior Notes, Series B due 2027
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Long-term debt fair value	100,000	100,000
Carrying Value | U.S. Senior Notes, Series A due 2025
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Long-term debt fair value	50,000	50,000
Carrying Value | U.S. Senior Notes, Series B due 2030
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Long-term debt fair value	125,000	125,000
Estimated Fair Value | Euro Senior Notes, Series A due 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Long-term debt fair value	141,709	144,323
Estimated Fair Value | Euro Senior Notes, Series B due 2028
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Long-term debt fair value	119,481	123,588
Estimated Fair Value | U.S. Senior Notes, Series A due 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Long-term debt fair value	25,284	25,437
Estimated Fair Value | U.S. Senior Notes, Series B due 2027
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Long-term debt fair value	107,293	109,552
Estimated Fair Value | U.S. Senior Notes, Series A due 2025
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Long-term debt fair value	52,845	53,474
Estimated Fair Value | U.S. Senior Notes, Series B due 2030
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Long-term debt fair value	$ 134,145	$ 138,036

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Benefit Plans - Benefit Plan Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 26, 2021	Jun. 27, 2020	Jun. 26, 2021	Jun. 27, 2020
Retirement Benefits [Abstract]
Service cost	$ 700	$ 592	$ 1,402	$ 1,210
Interest cost	443	486	883	1,144
Expected return on plan assets	(371)	(402)	(738)	(1,129)
Amortization of prior service and net actuarial loss	334	264	665	409
Net periodic benefit cost	$ 1,106	$ 940	$ 2,212	$ 1,634

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Benefit Plans - Narrative (Details) $ in Thousands, £ in Millions			3 Months Ended				6 Months Ended
	Apr. 06, 2020 USD ($)	Apr. 06, 2020 GBP (£)	Dec. 31, 2021 USD ($)	Jun. 26, 2021 USD ($)	Jun. 27, 2020 USD ($)	Jun. 27, 2020 GBP (£)	Jun. 26, 2021 USD ($)	Jun. 27, 2020 USD ($)	Apr. 07, 2020 USD ($)
Defined Benefit Plan Disclosure
Contributions expected				$ 2,200			$ 2,200
Expected direct payments				3,800			3,800
Defined benefit plan expense				1,106	$ 940		2,212	$ 1,634
Estimated decrease in pension cost									$ 55,000
Estimated percent reduction in pension costs									37.00%
Benefit obligation, unamortized actuarial loss	$ (13,400)	£ 13.4
Cash contribution					10,400	£ 8.4
Defined benefit pension plan and other adjustments
Defined Benefit Plan Disclosure
Benefit obligation, unamortized actuarial loss | £		£ 10.9
Forecast | Minimum
Defined Benefit Plan Disclosure
Estimated settlement charge			$ 18,000
Forecast | Maximum
Defined Benefit Plan Disclosure
Estimated settlement charge			$ 22,000
Foreign Plan
Defined Benefit Plan Disclosure
Defined benefit plan expense				500	500			1,000
Other comprehensive income as component of net period benefit cost, before tax				$ 200	$ 200		$ 300	$ 400

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Other Comprehensive Income (Loss) - Schedule of Components of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 26, 2021	Mar. 27, 2021	Jun. 27, 2020	Mar. 28, 2020	Jun. 26, 2021	Jun. 27, 2020
Other Comprehensive Income (Loss)
Pre-tax	$ 5,497		$ (4,676)		$ 678	$ (19,661)
Tax	43		(2,259)		95	(2,265)
Total change in other comprehensive income (loss)	5,454	$ (4,871)	(2,417)	$ (14,979)	583	(17,396)
Defined benefit pension plan and other adjustments
Other Comprehensive Income (Loss)
Pre-tax	372		(13,098)		878	(12,543)
Tax	43		(2,259)		95	(2,265)
Total change in other comprehensive income (loss)	329		(10,839)		783	(10,278)
Foreign currency translation adjustment
Other Comprehensive Income (Loss)
Pre-tax	5,125		8,422		(200)	(7,118)
Tax	0		0		0	0
Total change in other comprehensive income (loss)	$ 5,125		$ 8,422		$ (200)	$ (7,118)

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Other Comprehensive Income (Loss) - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 26, 2021	Mar. 27, 2021	Jun. 27, 2020	Mar. 28, 2020	Jun. 26, 2021	Jun. 27, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Balance	$ 1,660,737	$ 1,608,773	$ 1,476,948	$ 1,496,014	$ 1,608,773	$ 1,496,014
Other comprehensive loss, net of tax	5,454	(4,871)	(2,417)	(14,979)	583	(17,396)
Balance	1,742,220	1,660,737	1,462,434	1,476,948	1,742,220	1,462,434
Accumulated other comprehensive (loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Balance	(96,028)	(91,157)	(121,802)	(106,823)	(91,157)	(106,823)
Other comprehensive loss, net of tax	5,454	(4,871)	(2,417)	(14,979)
Balance	(90,574)	(96,028)	(124,219)	(121,802)	(90,574)	(124,219)
Defined benefit pension plan and other adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Balance		(34,141)		(18,046)	(34,141)	(18,046)
Other comprehensive loss, net of tax	329		(10,839)		783	(10,278)
Balance	(33,358)		(28,324)		(33,358)	(28,324)
Foreign currency translation adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax
Balance		$ (57,016)		$ (88,777)	(57,016)	(88,777)
Other comprehensive loss, net of tax	5,125		8,422		(200)	(7,118)
Balance	$ (57,216)		$ (95,895)		$ (57,216)	$ (95,895)

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Other Comprehensive Income (Loss) - Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 26, 2021	Jun. 27, 2020	Jun. 26, 2021	Jun. 27, 2020
Amortization of prior service and net actuarial loss | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income
Amortization of prior service and net actuarial loss	$ 509	$ 429	$ 1,013	$ 774

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Other Comprehensive Income (Loss) - Narrative (Details) - Apr. 06, 2020 £ in Millions, $ in Millions	GBP (£)	USD ($)
Equity [Abstract]
Benefit obligation, unamortized actuarial loss	£ (13.4)	$ 13.4

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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 26, 2021	Jun. 27, 2020	Jun. 26, 2021	Jun. 27, 2020
Income Tax Disclosure [Abstract]
Effective tax rate (percent)	13.80%	15.10%	16.70%	37.20%
Facility Closing | Automotive
Income Tax
Goodwill impairment charge		$ 33.8

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Earnings (loss) Per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 26, 2021	Mar. 27, 2021	Jun. 27, 2020	Mar. 28, 2020	Jun. 26, 2021	Jun. 27, 2020
Numerator:
Net income (loss) as reported	$ 82,095	$ 57,713	$ (8,991)	$ 24,644	$ 139,808	$ 15,653
Weighted average shares outstanding
Basic (in shares)	24,592		24,312		24,562	24,353
Effect of dilutive securities (in shares)	308		0		332	167
Diluted (in shares)	24,900		24,312		24,894	24,520
Earnings (loss) Per Share:
Basic earnings (loss) per share (in dollars per share)	$ 3.34		$ (0.37)		$ 5.69	$ 0.64
Diluted earnings (loss) per share (in dollars per share)	$ 3.30		$ (0.37)		$ 5.62	$ 0.64

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Earnings (loss) Per Share - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 26, 2021	Jun. 27, 2020	Mar. 28, 2020	Jun. 26, 2021	Jun. 27, 2020	Apr. 28, 2021	Apr. 29, 2020	Apr. 26, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities excluded (in shares)	41,216	328,624		20,266	212,290
Shares repurchased (in shares)	0			0	175,110
Repurchases of common stock			$ 22,927		$ 22,900
2019 Share Repurchase Program
Antidilutive Securities Excluded from Computation of Earnings Per Share
Repurchase authorized (in shares)								1,000,000
2020 Share Repurchase Program
Antidilutive Securities Excluded from Computation of Earnings Per Share
Repurchase authorized (in shares)						300,000,000.0	1,000,000

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Related Party Transactions (Details) - Equity Method Investee - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 26, 2021	Jun. 27, 2020	Jun. 26, 2021	Jun. 27, 2020	Dec. 26, 2020
Powersem
Related Party Transaction
Ownership percentage (percent)	45.00%		45.00%
Sales to related party	$ 0.0	$ 0.3	$ 0.2	$ 0.7
Purchase material/service from related party	0.7	0.8	1.8	1.0
Accounts receivable balance	0.0		0.0		$ 0.1
Accounts payable balance	$ 0.1		$ 0.1		0.1
EB Tech
Related Party Transaction
Ownership percentage (percent)	19.00%		19.00%
Sales to related party	$ 0.0	0.0	$ 0.0	0.0
Purchase material/service from related party	0.1	0.0	0.2	0.0
Accounts receivable balance	0.0		0.0		0.0
Accounts payable balance	$ 0.0		$ 0.0		0.0
ATEC
Related Party Transaction
Ownership percentage (percent)	24.00%		24.00%
Sales to related party	$ 0.0	0.0	$ 0.0	0.0
Purchase material/service from related party	2.8	$ 1.6	5.8	$ 3.4
Accounts receivable balance	0.0		0.0		0.0
Accounts payable balance	$ 1.8		$ 1.8		$ 0.2

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Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 26, 2021	Jun. 27, 2020	Jun. 26, 2021	Jun. 27, 2020
Segment Reporting Information
Net sales	$ 523,488	$ 307,337	$ 987,282	$ 653,433
Depreciation and amortization	24,215	23,734	48,413	47,536
Operating income (loss)	96,257	(11,950)	172,738	32,800
Interest expense	4,626	5,855	9,299	11,273
Foreign exchange (gain) loss	(1,676)	(6,010)	5,161	(3,426)
Other (income) expense, net	(1,890)	(1,210)	(9,627)	39
Income (loss) before income taxes	95,197	(10,585)	167,905	24,914
Electronics
Segment Reporting Information
Net sales	325,347	223,271	611,882	437,460
Depreciation and amortization	15,114	15,617	30,495	31,148
Electronics | Operating Segments
Segment Reporting Information
Operating income (loss)	74,236	32,651	129,759	64,923
Automotive
Segment Reporting Information
Net sales	133,318	61,999	261,847	166,769
Depreciation and amortization	6,946	7,071	14,019	14,258
Automotive | Operating Segments
Segment Reporting Information
Operating income (loss)	19,258	(8,857)	39,574	5,259
Industrial
Segment Reporting Information
Net sales	64,823	22,067	113,553	49,204
Depreciation and amortization	2,155	1,046	3,899	2,130
Industrial | Operating Segments
Segment Reporting Information
Operating income (loss)	8,375	(23)	11,881	3,511
Other | Corporate Non-Segment
Segment Reporting Information
Operating income (loss)	$ (5,612)	$ (35,721)	$ (8,476)	$ (40,893)

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Segment Information - Narrative (Details) $ in Thousands		3 Months Ended			6 Months Ended
	Jan. 28, 2021 USD ($)	Jun. 26, 2021 USD ($)	Jun. 27, 2020 USD ($)	Mar. 28, 2020 USD ($)	Jun. 26, 2021 USD ($) segment	Jun. 27, 2020 USD ($)
Segment Reporting Information
Number of operating segments | segment					3
Acquisition related costs		$ 100			$ 800
Restructuring charges		789	$ 1,824		1,226	$ 3,549
Hartland Controls
Segment Reporting Information
Inventory adjustment	$ 6,800	(500)
IXYS
Segment Reporting Information
Restructuring charges						39,600
Operating Income (Loss) | IXYS
Segment Reporting Information
Acquisition related Costs and integration costs			100			1,300
Operating Income (Loss) | Corporate Non-Segment | Hartland Controls
Segment Reporting Information
Inventory adjustment		3,300			6,800
Other | Operating Income (Loss) | Hartland Controls
Segment Reporting Information
Acquisition related costs		500			1,300
Restructuring charges		800			1,300
Industrial
Segment Reporting Information
Restructuring charges		6	772		169	1,096
Electronics
Segment Reporting Information
Restructuring charges		295	855		552	1,737
Electronics | Hartland Controls
Segment Reporting Information
Gain (loss) on sale of properties		1,000			900
Automotive
Segment Reporting Information
Restructuring charges		488	197		505	716
Automotive | IXYS
Segment Reporting Information
Restructuring charges			1,800			3,500
Other asset impairment charges				$ 2,200
Employee terminations
Segment Reporting Information
Restructuring charges		717	1,815		1,137	3,416
Employee terminations | IXYS
Segment Reporting Information
Restructuring charges			35,600
Employee terminations | Industrial
Segment Reporting Information
Restructuring charges		6	750		169	1,071
Employee terminations | Electronics
Segment Reporting Information
Restructuring charges		295	856		552	1,737
Employee terminations | Automotive
Segment Reporting Information
Restructuring charges		$ 416	209		$ 416	$ 608
Facility Closing | Automotive | IXYS
Segment Reporting Information
Other asset impairment charges			$ 33,800

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Segment Information - Revenues and Long-lived Assets by Geographical Area (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 26, 2021	Jun. 27, 2020	Jun. 26, 2021	Jun. 27, 2020	Dec. 26, 2020
Segment Reporting Information
Net sales	$ 523,488	$ 307,337	$ 987,282	$ 653,433
Long-lived assets	352,826		352,826		$ 344,178
Additions to long-lived assets			33,357	23,037
United States
Segment Reporting Information
Net sales	154,797	76,870	285,728	179,780
Long-lived assets	47,509		47,509		46,132
Additions to long-lived assets			1,732	2,026
China
Segment Reporting Information
Net sales	156,086	102,026	295,244	188,041
Long-lived assets	87,497		87,497		85,876
Additions to long-lived assets			7,127	4,516
Mexico
Segment Reporting Information
Long-lived assets	76,700		76,700		70,125
Additions to long-lived assets			13,231	4,260
Germany
Segment Reporting Information
Long-lived assets	37,447		37,447		37,976
Additions to long-lived assets			2,533	2,509
Philippines
Segment Reporting Information
Long-lived assets	69,308		69,308		66,994
Additions to long-lived assets			6,941	9,039
Other countries
Segment Reporting Information
Net sales	212,605	$ 128,441	406,310	285,612
Long-lived assets	$ 34,365		34,365		$ 37,075
Additions to long-lived assets			$ 1,793	$ 687