Accounts Receivable, Net and Supplemental Balance-Sheet Information (Tables)

3 Months Ended

Mar. 28, 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	March 28, 2020		December 31, 2019
Accounts receivable	$	168,503	$	176,849
Unbilled Receivables(1)	82,051		58,277
	250,554		235,126
Less allowances for doubtful accounts	2,887		3,815
Accounts receivable, net	$	247,667	$	231,311

Schedule of Other Current Assets [Table Text Block]

The following items comprise the amounts included in the balance sheets:

Other current assets	March 28, 2020		December 31, 2019
Refundable income taxes	$	1,366	$	339
Prepaid expense	17,364		25,664
Other	793		984
Total	$	19,523	$	26,987

Property, Plant and Equipment [Table Text Block]

Property and equipment, net	March 28, 2020		December 31, 2019
Land and land improvements	$	19,106	$	19,270
Buildings and leasehold improvements	44,267		44,414
Equipment	613,398		604,211
	676,771		667,895
Less accumulated depreciation	473,789		468,045
Total	$	202,982	$	199,850

Schedule of Other Assets, Noncurrent [Table Text Block]

Other assets, noncurrent	March 28, 2020		December 31, 2019
Assets invested for self-insurance	$	14,166	$	15,426
Investment--cost-method affiliate	1,314		1,314
Other	5,514		5,595
Total	$	20,994	$	22,335

Accrued expenses [Table Text Block]

Accrued expenses	March 28, 2020		December 31, 2019
Employee compensation	$	12,317	$	26,381
Accrued compensated absences	10,197		10,744
Self-insured medical claims	2,451		1,824
Income tax payable	5,590		6,420
Customer advances, deposits	85		1,674
Taxes, other than income	4,514		1,775
Other	3,077		3,613
Total	$	38,231	$	52,431

Other current liabilities [Table Text Block]

Other current liabilities	March 28, 2020		December 31, 2019
Notes payable	$	6,520	$	1,853
Current portion of:
Lease liability-operating leases	16,920		14,665
Self-insurance reserve	30,855		30,882
Total	$	54,295	$	47,400

Other Noncurrent Liabilities [Table Text Block]

Other noncurrent liabilities	March 28, 2020		December 31, 2019
Pension and retirement plans	$	6,804	$	6,552
Deferred income taxes	484		567
Other	5,107		5,149
Total	$	12,395	$	12,268