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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES        
Net income including noncontrolling interests $ 9,379 $ 11,612 $ 16,778 $ 22,621
Adjustments to reconcile net income to net cash provided by (used in) operating activities-        
Amortization of identifiable intangible assets 2,060 1,739 5,445 5,408
Depreciation expense 3,648 2,866 9,917 8,511
Goodwill impairment     727  
Bad debt expense 532 (60) 767 (378)
Deferred tax expense (benefit) (2,276) 692 (3,899) 1,168
Amortization of debt financing costs 83 65 213 180
Gain on sale of assets (526) (117) (748) (367)
Changes in the fair value of contingent earn-out obligations 210 (750) 210 (696)
Stock-based compensation expense 622 523 3,492 3,243
(Increase) decrease in-        
Receivables, net 47 23,944 (428) (6,976)
Inventories 147 315 (111) 302
Prepaid expenses and other current assets 1,104 (122) 2,755 (11)
Costs and estimated earnings in excess of billings 6,283 (886) (1,976) (3,996)
Other noncurrent assets (52) (186) 46 63
Increase (decrease) in-        
Accounts payable and accrued liabilities 1,473 671 (529) 5,413
Billings in excess of costs and estimated earnings (918) (13,517) 2,955 (11,248)
Other long-term liabilities 2,065 644 1,868 545
Net cash provided by (used in) operating activities 23,881 27,433 37,482 23,782
CASH FLOWS FROM INVESTING ACTIVITIES:        
Purchases of property and equipment (7,033) (5,234) (15,367) (12,471)
Proceeds from sales of property and equipment 692 64 1,232 566
Proceeds from businesses sold       43
Cash paid for acquisitions, earn-outs and intangible assets, net of cash acquired (2,845)   (54,204)  
Net cash used in investing activities (9,186) (5,170) (68,339) (11,862)
CASH FLOWS FROM FINANCING ACTIVITIES:        
Net borrowings (payments) on revolving line of credit (10,000) 5,000 42,000 5,000
Payments on other long-term debt   (3,400) (2,000) (5,400)
Payments on capital lease obligations (219)   (219)  
Debt financing costs (563)   (563) (552)
Payments of dividends to shareholders (2,070) (2,052) (6,209) (5,818)
Share repurchase program (5,777) (1,177) (6,282) (1,832)
Shares received in lieu of tax withholding   8 (531) (614)
Excess tax benefit of stock-based compensation (7) (17) 98 226
Proceeds from exercise of options 278 1,334 1,104 1,618
Distributions to noncontrolling interests (2,214)   (4,713)  
Net cash provided by (used in) financing activities (20,572) (304) 22,685 (7,372)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS (5,877) 21,959 (8,172) 4,548
CASH AND CASH EQUIVALENTS, beginning of period 49,759 23,346 52,054 40,757
CASH AND CASH EQUIVALENTS, end of period $ 43,882 $ 45,305 $ 43,882 $ 45,305