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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2021
Accounting Policies [Abstract]  
Assets and Liabilities Measured at Fair Value
Assets and liabilities measured at fair value on a recurring basis and fair value measurement level were as follows (in thousands):
Level20212020
Assets
Cash surrender value of life insurance2$23,147 $19,887 
Forward exchange contracts2— 16 
Total assets at fair value$23,147 $19,903 
Liabilities
Contingent consideration3$12,274 $9,454 
Deferred compensation25,962 5,099 
Forward exchange contracts2111 — 
Total liabilities at fair value$18,347 $14,553 
Accounts Receivable, Allowance for Credit Loss
Following is a summary of activity in the allowance for credit losses (in thousands):
202120202019
Balance, beginning$3,745 $4,828 $4,771 
Additions (reversals) charged to costs and expenses(27)647 836 
Deductions from reserves (1)
(676)(2,732)(858)
Other additions (deductions) (2)
212 1,002 79 
Balance, ending$3,254 $3,745 $4,828 
(1)    Represents amounts determined to be uncollectible and charged against reserves, net of collections on accounts previously charged against reserves.
(2)     Includes amounts assumed or established in connection with acquisitions and effects of foreign currency translation.
Other Current Assets Amounts included in other current assets were (in thousands):
20212020
Prepaid income taxes$10,485 $22,317 
Prepaid expenses and other21,401 21,925 
Total$31,886 $44,242 
Property, Plant and Equipment For financial reporting purposes, plant and equipment are depreciated over their estimated useful lives, primarily by using the straight-line method as follows:
Buildings and improvements10 to 30 years
Leasehold improvementslesser of 5 to 10 years or life of lease
Manufacturing equipmentlesser of 5 to 10 years or life of equipment
Office, warehouse and automotive equipment3 to 10 years
Schedule of Goodwill [Table Text Block] Changes in the carrying amounts of goodwill for each reportable segment were (in thousands):
IndustrialProcessContractorTotal
Balance, December 27, 2019$177,112 $110,997 $19,554 $307,663 
Additions, adjustments from business acquisitions— 29,657 — 29,657 
Foreign currency translation9,424 859 — 10,283 
Balance, December 25, 2020186,536 141,513 19,554 347,603 
Additions, adjustments from business acquisitions13,321 — — 13,321 
Foreign currency translation(4,460)(209)— (4,669)
Balance, December 31, 2021$195,397 $141,304 $19,554 $356,255 
Intangible Assets
Components of other intangible assets were (dollars in thousands):
Finite LifeIndefinite Life
Customer
Relationships		Patents and
Proprietary
Technology		Trademarks,
Trade Names
and Other		Trade
Names		Total
As of December 31, 2021
Cost
$194,505 $26,074 $900 $62,633 $284,112 
Accumulated amortization
(108,657)(15,734)(452)— (124,843)
Foreign currency translation(7,710)(707)— (1,112)(9,529)
Book value
$78,138 $9,633 $448 $61,521 $149,740 
Weighted average life in years
13105N/A
As of December 25, 2020
Cost
$186,073 $25,187 $900 $61,920 $274,080 
Accumulated amortization
(93,832)(12,924)(301)— (107,057)
Foreign currency translation(6,004)(538)— 188 (6,354)
Book value
$86,237 $11,725 $599 $62,108 $160,669 
Weighted average life in years
13105N/A
Future Amortization Expense Estimated future annual amortization expense based on the current carrying amount of other intangible assets is as follows (in thousands):
20222023202420252026Thereafter
Estimated Amortization Expense$17,893 $16,949 $15,394 $14,823 $7,959 $15,201 
Components of Other Assets Components of other assets were (in thousands):
20212020
Cash surrender value of life insurance$23,147 $19,887 
Capitalized software2,394 2,737 
Equity method investment7,541 7,610 
Prepaid pension— 9,144 
Deposits and other3,607 2,292 
Total$36,689 $41,670 
Components of Other Current Liabilities Components of other current liabilities were (in thousands):
20212020
Accrued self-insurance retentions$9,303 $8,041 
Accrued warranty and service liabilities14,463 13,082 
Accrued trade promotions15,872 12,140 
Payable for employee stock purchases15,746 14,554 
Customer advances and deferred revenue60,554 41,689 
Income taxes payable5,200 8,564 
Operating lease liabilities, current9,096 11,178 
Right of return refund liability18,614 16,303 
Other42,311 31,709 
Total$191,159 $157,260 
Accrued Warranty Liability Activity Following is a summary of activity in accrued warranty and service liabilities (in thousands):
20212020
Balance, beginning of year$13,082 $12,785 
Assumed in business acquisition23 155 
Charged to expense10,764 8,270 
Margin on parts sales reversed3,475 2,960 
Reductions for claims settled(12,881)(11,088)
Balance, end of year$14,463 $13,082 
Fair Market Value and Classification of Derivative Instruments Net derivative assets are reported on the balance sheet in accounts receivable and net derivative liabilities are reported as other current liabilities. The fair market value of such instruments follows (in thousands):
20212020
Foreign Currency Contracts
Assets$239 $114 
Liabilities(350)(98)
Net Assets (Liabilities)$(111)$16