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Accounts Receivable, Net and Supplemental Balance-Sheet Information (Tables)
 6 Months Ended
Jun. 27, 2020
Accounts Receivable, Net and Supplemental Balance-Sheet Information [Abstract] [Abstract]  
Accounts receivable, net [Table Text Block]
Accounts receivable, net, consisted of the following:
Accounts receivable, net
June 27,
2020
 
December 31,
2019
Accounts receivable
$
204,207

 
$
176,849

Unbilled Receivables(1)
68,509

 
58,277

 
272,716

 
235,126

Less allowances for doubtful accounts
3,796

 
3,815

Accounts receivable, net
$
268,920

 
$
231,311
Schedule of Other Current Assets [Table Text Block]
The following items comprise the amounts included in the balance sheets:
Other current assets
June 27,
2020
 
December 31,
2019
Refundable income taxes
$
—

 
$
339

Prepaid expenses
11,258

 
25,664

Other
712

 
984

Total
$
11,970

 
$
26,987
Property, Plant and Equipment [Table Text Block]
Property and equipment, net
June 27,
2020
 
December 31,
2019
Land and land improvements
$
19,169

 
$
19,270

Buildings and leasehold improvements
45,293

 
44,414

Equipment
617,446

 
604,211

 
681,908

 
667,895

Less accumulated depreciation
474,652

 
468,045

Total
$
207,256

 
$
199,850
Schedule of Other Assets, Noncurrent [Table Text Block]
Other assets, noncurrent
June 27,
2020
 
December 31,
2019
Assets invested for self-insurance
$
12,000

 
$
15,426

Investment--cost-method affiliate
1,267

 
1,314

Other
4,386

 
5,595

Total
$
17,653

 
$
22,335
Accrued expenses [Table Text Block]
Accrued expenses
June 27,
2020
 
December 31,
2019
Employee compensation
$
20,298

 
$
26,381

Accrued compensated absences
10,727

 
10,744

Self-insured medical claims
4,104

 
1,824

Income tax payable
14,809

 
6,420

Customer advances, deposits
1,367

 
1,674

Taxes, other than income
11,043

 
1,775

Other
3,513

 
3,613

Total
$
65,861

 
$
52,431
Other current liabilities [Table Text Block]
Other current liabilities
June 27,
2020
 
December 31,
2019
Notes payable
$
—

 
$
1,853

Current portion of:
 
 
 
Lease liability-operating leases
17,463

 
14,665

Self-insurance reserve
30,632

 
30,882

Total
$
48,095

 
$
47,400
Other Noncurrent Liabilities [Table Text Block]
Other noncurrent liabilities
June 27,
2020
 
December 31,
2019
Pension and retirement plans
$
6,830

 
$
6,552

Deferred income taxes
503

 
567

Other
4,038

 
5,149

Total
$
11,371

 
$
12,268