CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 22,057	$ 82,092
Accounts receivable, net of allowances of $2,337 and $2,441, respectively	409,497	375,353
Contract assets, net of allowances of $452 and $385, respectively	280,718	225,075
Current portion of receivable for insurance claims in excess of deductibles	9,755	11,078
Refundable income taxes	9,650	9,228
Prepaid expenses and other current assets	52,733	45,564
Total current assets	784,410	748,390
Property and equipment, net of accumulated depreciation of $336,347 and $322,128, respectively	212,055	196,092
Operating lease right-of-use assets	32,675	20,971
Goodwill	108,405	66,065
Intangible assets, net of accumulated amortization of $22,729 and $16,779, respectively	98,746	49,054
Receivable for insurance claims in excess of deductibles	21,262	32,443
Investment in joint ventures	3,155	3,978
Other assets	3,661	4,099
Total assets	1,264,369	1,121,092
Current liabilities:
Current portion of long-term debt	1,065	1,039
Current portion of operating lease obligations	9,405	7,765
Current portion of finance lease obligations	1,318	0
Accounts payable	251,646	200,744
Contract liabilities	203,163	167,931
Current portion of accrued self-insurance	23,526	24,242
Accrued income taxes	2,669	2,021
Other current liabilities	72,614	94,857
Total current liabilities	565,406	498,599
Deferred income tax liabilities	24,613	24,620
Long-term debt	54,381	3,464
Accrued self-insurance	39,666	50,816
Operating lease obligations, net of current maturities	23,272	13,230
Finance lease obligations, net of current maturities	3,026	0
Other liabilities	22,923	11,261
Total liabilities	733,287	601,990
Commitments and contingencies
Stockholders’ equity:
Preferred stock—$0.01 par value per share; 4,000,000 authorized shares; none issued and outstanding at June 30, 2022 and December 31, 2021	0	0
Common stock—$0.01 par value per share; 100,000,000 authorized shares; 16,723,583 and 16,870,636 shares issued and outstanding at June 30, 2022 and December 31, 2021, respectively	167	168
Additional paid-in capital	158,691	163,754
Accumulated other comprehensive income (loss)	(1,653)	173
Retained earnings	373,877	355,007
Total stockholders’ equity	531,082	519,102
Total liabilities and stockholders’ equity	$ 1,264,369	$ 1,121,092