CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 49,206	$ 25,449
Adjustments to reconcile net income to net cash provided by operating activities—
Amortization of identifiable intangible assets	8,753	7,302
Depreciation expense	10,969	9,597
Goodwill impairment		1,105
Bad debt expense (benefit)	1,186	(62)
Deferred tax provision (benefit)	8,400	(2,547)
Amortization of debt financing costs	192	188
Gain on sale of assets	(411)	(280)
Changes in the fair value of contingent earn-out obligations	(59)	624
Stock-based compensation	4,874	3,447
(Increase) decrease in-
Receivables, net	(55,675)	(38,886)
Inventories	(1,435)	(924)
Prepaid expenses and other current assets	4,549	4,043
Costs and estimated earnings in excess of billings and unbilled accounts receivable	(18,711)	(8,781)
Other noncurrent assets	61	420
Increase (decrease) in-
Accounts payable and accrued liabilities	9,470	13,422
Billings in excess of costs and estimated earnings	24,831	6,835
Other long-term liabilities	(8,682)	228
Net cash provided by (used in) operating activities	37,518	21,180
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(14,123)	(11,646)
Proceeds from sales of property and equipment	661	605
Cash paid for acquisitions, net of cash acquired	(13,668)	(83,710)
Net cash used in investing activities	(27,130)	(94,751)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from revolving line of credit	34,000	110,000
Payments on revolving line of credit	(37,000)	(21,500)
Payments on other debt	(1,069)	(287)
Payments on capital lease obligations		(105)
Debt financing costs	(844)
Payments of dividends to stockholders	(5,760)	(5,405)
Share repurchase	(6,830)	(3,816)
Shares received in lieu of tax withholding	(1,540)	(1,419)
Proceeds from exercise of options	2,159	1,296
Deferred acquisition payments		(2,802)
Payments for contingent consideration arrangements	2,045
Net cash provided by (used in) financing activities	(18,929)	75,962
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(8,541)	2,391
CASH AND CASH EQUIVALENTS, beginning of period	36,542	32,074
CASH AND CASH EQUIVALENTS, end of period	$ 28,001	$ 34,465