Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 553	$ 1,567
Costs and estimated earnings in excess of billings	174,102	158,529
Inventories	46,923	42,709
Prepayments and other current assets	20,553	17,651
Total current assets	886,532	766,063
Noncurrent assets:
Property, plant and equipment, net of accumulated depreciation of $153,272 and $143,831, respectively	129,361	116,018
Goodwill	143,224	143,224
Other intangible assets, net of accumulated amortization of $9,984 and $8,738, respectively	466	2,004
Operating lease right-of-use assets	68,852	53,233
Noncurrent retention receivable	32,849	21,355
Investments	17,648	8,413
Other	360	272
Total noncurrent assets	392,760	344,519
Total assets	1,279,292	1,110,582
Current liabilities:
Contract liabilities	221,662	198,231
Accounts payable	160,873	116,573
Taxes payable	14,006	8,557
Accrued compensation	66,960	44,721
Current portion of operating lease liabilities	26,110	21,143
Accrued payroll-related liabilities	37,292	35,342
Total current liabilities	559,561	452,183
Noncurrent liabilities:
Related-party notes payable	214,525	168,531
Deferred income taxes	965	6,535
Operating lease liabilities	43,247	32,504
Other	7,691	1,979
Total noncurrent liabilities	266,428	209,549
Total liabilities	825,989	661,732
Commitments and contingencies
Common stockholder’s equity:
Common Stock, stated value $1, no par value; 1,000 shares authorized, issued and outstanding	1	1
Other paid-in capital	137,947	136,184
Retained earnings	315,355	312,665
Total stockholder’s equity	453,303	448,850
Total liabilities and stockholder’s equity	1,279,292	1,110,582
Nonrelated party
Current assets:
Receivables, net	632,131	534,100
Current liabilities:
Other accrued liabilities	16,788	13,001
Related party
Current assets:
Receivables, net	12,270	11,507
Noncurrent assets:
Operating lease right-of-use assets	68	136
Current liabilities:
Other accrued liabilities	15,870	14,615
Current portion of operating lease liabilities	68	90
Noncurrent liabilities:
Operating lease liabilities	$ 0	$ 46