CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 87,747	$ 47,733
Adjustments to reconcile net income to net cash provided by operating activities—
Amortization of identifiable intangible assets	14,102	12,622
Depreciation expense	16,630	14,714
Goodwill impairment		1,105
Bad debt expense	2,905	29
Deferred tax provision (benefit)	5,520	(112)
Amortization of debt financing costs	288	282
Gain on sale of assets	(630)	(464)
Changes in the fair value of contingent earn-out obligations	(493)	(1,845)
Stock-based compensation	6,021	4,317
(Increase) decrease in—
Receivables, net	(80,726)	(38,051)
Inventories	(1,917)	(1,059)
Prepaid expenses and other current assets	3,085	(608)
Costs and estimated earnings in excess of billings and unbilled accounts receivable	(18,328)	(7,348)
Other noncurrent assets	(199)	913
Increase (decrease) in—
Accounts payable and accrued liabilities	19,537	22,595
Billings in excess of costs and estimated earnings	17,682	10,309
Other long-term liabilities	(3,222)	560
Net cash provided by operating activities	68,002	65,692
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(22,059)	(16,830)
Proceeds from sales of property and equipment	1,077	784
Cash paid for acquisitions, net of cash acquired	(65,287)	(94,860)
Net cash used in investing activities	(86,269)	(110,906)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from revolving line of credit	104,000	140,000
Payments on revolving line of credit	(79,000)	(74,000)
Payments on other debt	(1,094)	(798)
Payments on capital lease obligations		(133)
Debt financing costs	(844)
Payments of dividends to stockholders	(8,930)	(8,199)
Share repurchase	(11,573)	(8,909)
Shares received in lieu of tax withholding	(1,540)	(1,419)
Proceeds from exercise of options	2,899	1,296
Deferred acquisition payments	(750)	(2,802)
Payments for contingent consideration arrangements	2,195	2,400
Net cash provided by financing activities	973	42,636
NET DECREASE IN CASH AND CASH EQUIVALENTS	(17,294)	(2,578)
CASH AND CASH EQUIVALENTS, beginning of period	36,542	32,074
CASH AND CASH EQUIVALENTS, end of period	$ 19,248	$ 29,496

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