CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 25,449	$ 27,558
Adjustments to reconcile net income to net cash provided by operating activities
Amortization of identifiable intangible assets	7,302	4,190
Depreciation expense	9,597	8,968
Goodwill impairment	1,105
Bad debt expense (benefit)	(62)	(297)
Deferred tax expense (benefit)	(2,547)	(162)
Amortization of debt financing costs	188	179
Gain on sale of assets	(280)	(357)
Changes in the fair value of contingent earn-out obligations	624	336
Stock-based compensation	3,447	3,349
(Increase) decrease in-
Receivables, net	(38,886)	(6,684)
Inventories	(924)	(532)
Prepaid expenses and other current assets	4,043	(1,649)
Costs and estimated earnings in excess of billings	(8,781)	(1,239)
Other noncurrent assets	420	(84)
Increase (decrease) in-
Accounts payable and accrued liabilities	13,422	6,429
Billings in excess of costs and estimated earnings	6,835	(4,220)
Other long-term liabilities	228	636
Net cash provided by operating activities	21,180	36,421
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(11,646)	(10,904)
Proceeds from sales of property and equipment	605	494
Cash paid for acquisitions, net of cash acquired	(83,710)	(58,490)
Net cash used in investing activities	(94,751)	(68,900)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from revolving line of credit	110,000	138,000
Payments on revolving line of credit	(21,500)	(112,000)
Payments on other debt	(287)	(42)
Payments on capital lease obligations	(105)	(133)
Debt financing costs		(789)
Payments of dividends to stockholders	(5,405)	(5,044)
Share repurchase	(3,816)	(4,924)
Shares received in lieu of tax withholding	(1,419)	(1,304)
Proceeds from exercise of options	1,296	733
Deferred acquisition payments	(2,802)
Payments for contingent consideration arrangements		(200)
Net cash provided by (used in) financing activities	75,962	14,297
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	2,391	(18,182)
CASH AND CASH EQUIVALENTS, beginning of period	32,074	56,464
CASH AND CASH EQUIVALENTS, end of period	$ 34,465	$ 38,282