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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
CASH FLOWS FROM OPERATING ACTIVITIES        
Net income including noncontrolling interests $ 15,782 $ 6,336 $ 22,671 $ 7,399
Adjustments to reconcile net income to net cash provided by (used in) operating activities-        
Amortization of identifiable intangible assets 1,893 1,781 3,724 3,385
Depreciation expense 3,948 3,219 7,740 6,269
Goodwill impairment   727   727
Bad debt expense 683 202 894 235
Deferred tax expense (benefit) (1,022) (1) (2,263) (1,623)
Amortization of debt financing costs 65 65 158 130
Gain on sale of assets (151) (89) (327) (222)
Changes in the fair value of contingent earn-out obligations (125) 130 (125)  
Stock-based compensation expense 1,790 1,439 3,178 2,870
(Increase) decrease in-        
Receivables, net (20,845) (7,805) (17,991) (475)
Inventories (177) 135 (1,440) (258)
Prepaid expenses and other current assets 1,071 827 1,806 1,651
Costs and estimated earnings in excess of billings (2,268) (3,816) (5,860) (8,259)
Other noncurrent assets (493) (84) (215) 98
Increase (decrease) in-        
Accounts payable and accrued liabilities 22,237 9,167 25,958 (2,002)
Billings in excess of costs and estimated earnings 8,016 10,054 12,833 3,873
Other long-term liabilities (159) 98 (81) (197)
Net cash provided by operating activities 30,245 22,385 50,660 13,601
CASH FLOWS FROM INVESTING ACTIVITIES:        
Purchases of property and equipment (5,685) (4,452) (9,308) (8,334)
Proceeds from sales of property and equipment 279 323 485 540
Cash paid for acquisitions, net of cash acquired (511) (47,359) (5,861) (51,359)
Net cash used in investing activities (5,917) (51,488) (14,684) (59,153)
CASH FLOWS FROM FINANCING ACTIVITIES:        
Proceeds from revolving line of credit   83,500 14,500 101,500
Payment on revolving line of credit (18,000) (38,500) (35,000) (49,500)
Payments on other long-term debt   (2,000)   (2,000)
Payments on capital lease obligations (79)   (163)  
Payments of dividends to shareholders (2,242) (2,072) (4,479) (4,139)
Share repurchase program (1,525) (89) (1,525) (505)
Shares received in lieu of tax withholding (937) (531) (937) (531)
Excess tax benefit of stock-based compensation 371 119 461 105
Proceeds from exercise of options 1,980 284 2,277 826
Distributions to noncontrolling interests (2,074) (2,499) (2,115) (2,499)
Payments for contingent consideration arrangements     (345)  
Net cash provided by (used in) financing activities (22,506) 38,212 (27,326) 43,257
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 1,822 9,109 8,650 (2,295)
CASH AND CASH EQUIVALENTS, beginning of period 38,892 40,650 32,064 52,054
CASH AND CASH EQUIVALENTS, end of period $ 40,714 $ 49,759 $ 40,714 $ 49,759