CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
CURRENT ASSETS:
Cash and cash equivalents	$ 25,219	$ 36,542
Billed accounts receivable, less allowance for doubtful accounts of $3,516 and $3,400, respectively	392,998	382,867
Unbilled accounts receivable	36,634
Other receivables	17,685	21,235
Inventories	11,029	10,303
Prepaid expenses and other	6,135	8,294
Costs and estimated earnings in excess of billings	2,093	30,116
Total current assets	491,793	489,357
PROPERTY AND EQUIPMENT, NET	88,298	87,591
GOODWILL	203,199	200,584
IDENTIFIABLE INTANGIBLE ASSETS, NET	78,332	76,044
DEFERRED TAX ASSETS	16,890	22,966
OTHER NONCURRENT ASSETS	4,206	4,578
Total assets	882,718	881,120
CURRENT LIABILITIES:
Current maturities of long-term debt	1,113	613
Accounts payable	128,249	132,011
Accrued compensation and benefits	56,199	69,217
Billings in excess of costs and estimated earnings	107,939	106,005
Accrued self-insurance	32,099	32,228
Other current liabilities	40,437	33,654
Total current liabilities	366,036	373,728
LONG-TERM DEBT	64,880	59,926
DEFERRED TAX LIABILITIES	4,835	2,263
OTHER LONG-TERM LIABILITIES	17,829	27,258
Total liabilities	453,580	463,175
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, 4,035,263 and 3,936,291 shares, respectively	(69,322)	(63,519)
Additional paid-in capital	315,907	312,784
Retained earnings	182,142	168,269
Total stockholders’ equity	429,138	417,945
Total liabilities and stockholders’ equity	$ 882,718	$ 881,120