CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 22,850	$ 51,040
Accounts receivable, net of allowances of $2,106 and $2,073, respectively	474,984	472,543
Contract assets, net of allowances of $601 and $499, respectively	382,406	300,615
Current portion of receivable for insurance claims in excess of deductibles	9,056	9,325
Refundable income taxes	11,262	8,944
Prepaid expenses and other current assets	39,643	47,824
Total current assets	940,201	890,291
Property and equipment, net of accumulated depreciation of $363,112 and $351,753, respectively	247,479	233,175
Operating lease right-of-use assets	28,500	30,544
Goodwill	116,976	115,847
Intangible assets, net of accumulated amortization of $28,061 and $25,439, respectively	86,013	87,557
Receivable for insurance claims in excess of deductibles	34,020	34,210
Investment in joint ventures	5,933	3,697
Other assets	5,681	3,537
Total assets	1,464,803	1,398,858
Current liabilities:
Current portion of long-term debt	5,175	5,074
Current portion of operating lease obligations	9,835	9,711
Current portion of finance lease obligations	2,349	1,127
Accounts payable	337,699	315,323
Contract liabilities	228,818	227,055
Current portion of accrued self-insurance	26,537	28,752
Other current liabilities	74,147	79,918
Total current liabilities	684,560	666,960
Deferred income tax liabilities	46,141	45,775
Long-term debt	39,950	35,479
Accrued self-insurance	51,548	51,287
Operating lease obligations, net of current maturities	18,635	20,845
Finance lease obligations, net of current maturities	575	2,313
Other liabilities	19,094	15,999
Total liabilities	860,503	838,658
Commitments and contingencies
Shareholders’ equity:
Preferred stock—$0.01 par value per share; 4,000,000 authorized shares; none issued and outstanding at June 30, 2023 and December 31, 2022	0	0
Common stock—$0.01 par value per share; 100,000,000 authorized shares; 16,709,534 and 16,563,767 shares issued and outstanding at June 30, 2023 and December 31, 2022, respectively	167	165
Additional paid-in capital	158,555	161,427
Accumulated other comprehensive loss	(4,024)	(6,300)
Retained earnings	449,602	404,908
Total shareholders’ equity	604,300	560,200
Total liabilities and shareholders’ equity	$ 1,464,803	$ 1,398,858