CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income including noncontrolling interests	$ 48,029	$ 42,557
Adjustments to reconcile net income to net cash provided by operating activities
Amortization of identifiable intangible assets	6,227	5,601
Depreciation expense	13,444	11,785
Bad debt expense	(177)	1,132
Deferred tax benefit	(606)	(2,755)
Amortization of debt financing costs	273	238
Gain on sale of assets	(523)	(625)
Changes in the fair value of contingent earn-out obligations	(468)	(125)
Stock-based compensation expense	3,868	4,254
(Increase) decrease in-
Receivables, net	(4,301)	(1,283)
Inventories	(298)	(218)
Prepaid expenses and other current assets	(3,648)	27
Costs and estimated earnings in excess of billings	(3,726)	(8,651)
Other noncurrent assets	(128)	(275)
Increase (decrease) in-
Accounts payable and accrued liabilities	1,628	19,986
Billings in excess of costs and estimated earnings	(10,928)	2,912
Other long-term liabilities	1,088	23
Net cash provided by operating activities	49,754	74,583
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(17,257)	(15,216)
Proceeds from sales of property and equipment	847	891
Cash paid for acquisitions, net of cash acquired	(58,510)	(6,158)
Net cash used in investing activities	(74,920)	(20,483)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from revolving line of credit	144,000	24,500
Payments on revolving line of credit	(129,000)	(53,000)
Payments on other debt	567
Payments on capital lease obligations	(194)	(277)
Debt financing costs	(789)
Payments of dividends to shareholders	(7,663)	(6,924)
Share repurchase program	(10,977)	(4,930)
Shares received in lieu of tax withholding	(1,304)	(937)
Excess tax benefit of stock-based compensation, financing activities		747
Proceeds from exercise of options	733	2,971
Distributions to noncontrolling interests		(2,897)
Payments for contingent consideration arrangements	(200)	(345)
Net cash used in financing activities	(5,961)	(41,092)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(31,127)	13,008
CASH AND CASH EQUIVALENTS, beginning of period	56,464	32,064
CASH AND CASH EQUIVALENTS, end of period	$ 25,337	$ 45,072