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

9 Months Ended

Sep. 30, 2023

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	September 30, 2023		December 31, 2022
Accounts receivable	$	258,569	$	242,427
Unbilled receivables(1)	110,576		82,605
	369,145		325,032
Less allowances for credit losses	2,156		3,222
Accounts receivable, net	$	366,989	$	321,810

(1)    Unbilled receivables consist of work-in-process in accordance with the terms of contracts, primarily with utility services customers.

Schedule of Other Current Assets [Table Text Block]

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

Other current assets	September 30, 2023		December 31, 2022
Refundable income taxes	$	381	$	14
Prepaid expenses	46,298		32,080
Mitigation bank credit inventory	27,573		6,351
Assets invested for self-insurance	20,658		24,828
Payroll taxes refundable	14,264		18,283
Other	5,518		2,396
Total	$	114,692	$	83,952

Property, Plant and Equipment [Table Text Block]

Property and equipment, net	September 30, 2023		December 31, 2022
Land and land improvements	$	25,798	$	26,023
Buildings and leasehold improvements	92,861		80,768
Equipment	674,020		663,207
	792,679		769,998
Less accumulated depreciation	497,136		501,459
Total	$	295,543	$	268,539

Schedule of Other Assets, Noncurrent [Table Text Block]

Other assets, noncurrent	September 30, 2023		December 31, 2022
Investment--cost-method affiliate	$	933	$	1,258
Deferred income taxes	4,602		6,828
Cloud computing arrangements	474		2,652
Insurance receivable	200,000		7,500
Other	4,900		4,603
Total	$	210,909	$	22,841

Accrued expenses [Table Text Block]

Accrued expenses	September 30, 2023		December 31, 2022
Employee compensation	$	36,118	$	35,536
Accrued compensated absences	14,827		13,034
Self-insured medical claims	2,573		2,806
Income tax payable	8,174		6,573
Customer advances, deposits	2,148		7,736
Taxes, other than income	2,386		5,764
Other	5,549		6,005
Total	$	71,775	$	77,454

Other current liabilities [Table Text Block]

Other current liabilities	September 30, 2023		December 31, 2022
Mitigation bank liabilities	$	6,106	$	—
Current portion of:
Lease liability-operating leases	37,972		34,652
Self-insurance accruals	54,486		56,221
Total	$	98,564	$	90,873

Other Noncurrent Liabilities [Table Text Block]

Other noncurrent liabilities	September 30, 2023		December 31, 2022
Non-qualified retirement plans	$	5,465	$	8,336
Litigation accrual	200,000		7,500
Other	7,553		8,184
Total	$	213,018	$	24,020