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
Jun. 30, 2014
Dec. 31, 2013
Business Acquisition [Line Items]    
Goodwill $ 255,515 $ 211,847
Nine acquisitions in 2014
   
Business Acquisition [Line Items]    
Accounts receivable, net 2,692  
Materials and supplies 404  
Prepaid expenses 91  
Equipment and property 3,555  
Goodwill 42,248  
Customer contracts 17,896  
Other intangible assets 5,061  
Current liabilities (5,875)  
Other assets and liabilities, net 31  
Total consideration paid 66,103  
Less: Contingent consideration liability (6,443)  
Total cash purchase price $ 59,660