Quarterly report pursuant to Section 13 or 15(d)

BUSINESS COMBINATIONS (Details)

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BUSINESS COMBINATIONS (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Business Acquisition [Line Items]    
Goodwill $ 235,257 $ 211,847
Seven acquisitions in 2014
   
Business Acquisition [Line Items]    
Accounts receivable, net 2,687  
Materials and supplies 314  
Prepaid expenses 91  
Equipment and property 3,199  
Goodwill 22,803  
Customer contracts 28,819  
Other intangible assets 5,939  
Current liabilities (5,361)  
Other assets and liabilities, net 31  
Total consideration paid 58,522  
Less: Contingent consideration liability (4,947)  
Total cash purchase price $ 53,575