CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
CURRENT ASSETS:
Cash and cash equivalents	$ 48,560	$ 57,214
Billed accounts receivable, less allowance for credit losses of $9,718 and $10,640, respectively	1,176,378	1,024,082
Unbilled accounts receivable, less allowance for credit losses of $1,031 and $1,011, respectively	81,151	77,030
Other receivables, less allowance for credit losses of $518 and $510, respectively	41,912	38,369
Inventories	37,013	35,309
Prepaid expenses and other	47,190	48,456
Costs and estimated earnings in excess of billings, less allowance for credit losses of $52 and $80, respectively	26,820	27,211
Total current assets	1,459,024	1,307,671
PROPERTY AND EQUIPMENT, NET	155,021	143,949
LEASE RIGHT-OF-USE ASSET	134,755	130,666
GOODWILL	637,434	611,789
IDENTIFIABLE INTANGIBLE ASSETS, NET	296,070	273,901
DEFERRED TAX ASSETS	143,202	115,665
OTHER NONCURRENT ASSETS	13,965	13,837
Total assets	2,839,471	2,597,478
CURRENT LIABILITIES:
Current maturities of long-term debt	11,468	9,000
Accounts payable	351,509	337,385
Accrued compensation and benefits	115,606	127,765
Billings in excess of costs and estimated earnings and deferred revenue	717,294	548,293
Accrued self-insurance	23,865	27,644
Other current liabilities	186,917	120,715
Total current liabilities	1,406,659	1,170,802
LONG-TERM DEBT	197,761	247,245
LEASE LIABILITIES	115,018	111,744
OTHER LONG-TERM LIABILITIES	66,543	67,764
Total liabilities	1,785,981	1,597,555
COMMITMENTS AND CONTINGENCIES
STOCKHOLDERS' EQUITY:
Preferred stock, $.01 par, 5,000,000 shares authorized, none issued and outstanding
Common stock, $.01 par, 102,969,912 shares authorized, 41,123,365 and 41,123,365 shares issued, respectively	411	411
Treasury stock, at cost, 5,371,392 and 5,362,224 shares, respectively	(191,411)	(187,212)
Additional paid-in capital	338,884	332,080
Retained earnings	905,606	854,644
Total stockholders' equity	1,053,490	999,923
Total liabilities and stockholders' equity	$ 2,839,471	$ 2,597,478