Quarterly report pursuant to Section 13 or 15(d)

BUSINESS COMBINATIONS (Details)

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BUSINESS COMBINATIONS (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Business Acquisition [Line Items]    
Goodwill $ 269,867 $ 255,563
Acquisition [Member]    
Business Acquisition [Line Items]    
Accounts receivable 1,470  
Materials and supplies 57  
Equipment and property 845  
Goodwill 17,868  
Customer contracts 6,592  
Other intangible assets 5,239  
Current liabilities (1,305)  
Other assets and liabilities, net 71  
Total consideration paid $ 30,837