CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
CURRENT ASSETS:
Cash and cash equivalents	$ 54,896	$ 50,788
Billed accounts receivable, less allowance for credit losses of $9,087 and $6,907, respectively	619,544	619,037
Unbilled accounts receivable, less allowance for credit losses of $784 and $0, respectively	45,596	55,542
Other receivables, less allowance for credit losses of $759 and $0, respectively	44,212	37,632
Inventories	13,472	10,053
Prepaid expenses and other	15,510	14,396
Costs and estimated earnings in excess of billings, less allowance for credit losses of $79 and $0, respectively	18,622	2,736
Total current assets	811,852	790,184
PROPERTY AND EQUIPMENT, NET	117,206	109,796
LEASE RIGHT-OF-USE ASSET	94,727	84,073
GOODWILL	464,392	332,447
IDENTIFIABLE INTANGIBLE ASSETS, NET	231,807	159,974
DEFERRED TAX ASSETS	29,401	21,923
OTHER NONCURRENT ASSETS	7,970	6,615
Total assets	1,757,355	1,505,012
CURRENT LIABILITIES:
Current maturities of long-term debt		20,817
Accounts payable	204,145	196,195
Accrued compensation and benefits	121,864	102,891
Billings in excess of costs and estimated earnings	226,237	166,918
Accrued self-insurance	49,166	39,546
Other current liabilities	91,492	81,630
Total current liabilities	692,904	607,997
LONG-TERM DEBT, NET	235,733	205,318
LEASE LIABILITIES	80,576	72,697
DEFERRED TAX LIABILITIES	1,339	1,425
OTHER LONG-TERM LIABILITIES	50,374	32,271
Total liabilities	1,060,926	919,708
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, 4,935,186 and 4,465,448 shares, respectively	(129,243)	(103,960)
Additional paid-in capital	322,451	320,168
Retained earnings	502,810	368,685
Total stockholders' equity	696,429	585,304
Total liabilities and stockholders' equity	$ 1,757,355	$ 1,505,012