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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES        
Net income including noncontrolling interests $ 6,336 $ 8,314 $ 7,399 $ 11,009
Adjustments to reconcile net income to net cash provided by (used in) operating activities-        
Amortization of identifiable intangible assets 1,781 1,740 3,385 3,669
Depreciation expense 3,219 2,799 6,269 5,645
Goodwill impairment 727   727  
Bad debt expense 202 (471) 235 (318)
Deferred tax expense (benefit) (1) 1,598 (1,623) 476
Amortization of debt financing costs 65 58 130 115
Gain on sale of assets (89) (111) (222) (250)
Changes in the fair value of contingent earn-out obligations 130 27   54
Stock-based compensation expense 1,439 1,793 2,870 2,720
(Increase) decrease in-        
Receivables, net (7,805) (18,928) (475) (30,920)
Inventories 135 (50) (258) (13)
Prepaid expenses and other current assets 827 (83) 1,651 111
Costs and estimated earnings in excess of billings (3,816) 4,528 (8,259) (3,110)
Other noncurrent assets (84) 127 98 249
Increase (decrease) in-        
Accounts payable and accrued liabilities 9,167 4,595 (2,002) 4,742
Billings in excess of costs and estimated earnings 10,054 799 3,873 2,269
Other long-term liabilities 98 (35) (197) (99)
Net cash provided by (used in) operating activities 22,385 6,700 13,601 (3,651)
CASH FLOWS FROM INVESTING ACTIVITIES:        
Purchases of property and equipment (4,452) (4,029) (8,334) (7,237)
Proceeds from sales of property and equipment 323 325 540 502
Proceeds from businesses sold       43
Cash paid for acquisitions, earn-outs and intangible assets, net of cash acquired (47,359)   (51,359)  
Net cash used in investing activities (51,488) (3,704) (59,153) (6,692)
CASH FLOWS FROM FINANCING ACTIVITIES:        
Net borrowings (payments) on revolving line of credit 45,000   52,000  
Payments on other long-term debt (2,000) (2,000) (2,000) (2,000)
Debt financing costs   (552)   (552)
Payments of dividends to shareholders (2,072) (1,913) (4,139) (3,766)
Share repurchase program (89) (510) (505) (655)
Shares received in lieu of tax withholding (531) (622) (531) (622)
Excess tax benefit of stock-based compensation 119 243 105 243
Proceeds from exercise of options 284 269 826 284
Distributions to noncontrolling interests (2,499)   (2,499)  
Net cash provided by (used in) financing activities 38,212 (5,085) 43,257 (7,068)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 9,109 (2,089) (2,295) (17,411)
CASH AND CASH EQUIVALENTS, beginning of period 40,650 25,435 52,054 40,757
CASH AND CASH EQUIVALENTS, end of period $ 49,759 $ 23,346 $ 49,759 $ 23,346