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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net income (loss) including noncontrolling interests $ 11,849 $ (36,492) $ 14,740
Adjustments to reconcile net income (loss) to net cash provided by operating activities-      
(Gain) loss on disposition of discontinued operations     (723)
Write-off of debt financing costs     181
Amortization of identifiable intangible assets 8,837 7,462 6,217
Depreciation expense 11,793 12,591 11,225
Goodwill and other intangible asset impairments   58,922 5,734
Bad debt expense 2,453 936 364
Deferred tax expense (benefit) 3,541 (9,525) (3,484)
Amortization of debt financing costs 229 226 157
Gain on sale of assets (607) (239) (525)
Changes in the fair value of contingent earn-out obligations (662) (5,528) (1,574)
Stock-based compensation expense 2,797 3,604 3,687
(Increase) decrease in-      
Receivables, net 2,913 10,390 13,405
Inventories 1,195 (270) 1,034
Prepaid expenses and other current assets 370 977 (1,469)
Costs and estimated earnings in excess of billings 1,636 4,162 3,985
Other noncurrent assets (3,334) 917 (813)
Increase (decrease) in-      
Accounts payable and accrued liabilities (15,507) (21,477) 47
Billings in excess of costs and estimated earnings 1,776 5,426 (12,684)
Taxes paid related to pre-acquisition equity transactions of an acquired company     (7,056)
Other long-term liabilities 1,231 (2,402) (299)
Net cash provided by operating activities 30,510 29,680 32,149
CASH FLOWS FROM INVESTING ACTIVITIES:      
Purchases of property and equipment (11,782) (8,666) (7,089)
Proceeds from sales of property and equipment 1,106 717 1,381
Proceeds from businesses sold 164 156 1,514
Sales of marketable securities   2,000 3,925
Cash paid for acquisitions, earn-outs and intangible assets, net of cash acquired (12,656) (29,957) (42,732)
Net cash used in investing activities (23,168) (35,750) (43,001)
CASH FLOWS FROM FINANCING ACTIVITIES:      
Payments on other long-term debt (7,349) (14,387) (17,749)
Debt financing costs   (517) (896)
Payments of dividends to shareholders (7,498) (7,520) (7,530)
Share repurchase program (2,860) (7,256) (5,074)
Shares received in lieu of tax withholding (544) (662) (616)
Excess tax benefit of stock-based compensation 100 210 740
Proceeds from exercise of options 329 293 473
Capital contribution from noncontrolling interests   800  
Net cash used in financing activities (17,822) (29,039) (30,652)
NET DECREASE IN CASH AND CASH EQUIVALENTS (10,480) (35,109) (41,504)
CASH AND CASH EQUIVALENTS, beginning of year-continuing operations and discontinued operations 51,237 86,346 127,850
CASH AND CASH EQUIVALENTS, end of year-continuing operations and discontinued operations $ 40,757 $ 51,237 $ 86,346