Annual report pursuant to Section 13 and 15(d)

ACQUISITIONS (Details)

v3.10.0.1
ACQUISITIONS (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
acquisition
Dec. 31, 2017
USD ($)
acquisition
Dec. 31, 2016
USD ($)
Business Acquisition [Line Items]      
Number of acquisitions | acquisition 38 23  
Cash purchase price for acquisitions $ 76,800 $ 130,200  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]      
Materials and supplies 15,788 14,983  
Equipment and property, net 136,885 134,088  
Goodwill 368,481 346,514 $ 255,665
Customer contracts 178,075 152,869  
Other intangible assets 11,043 11,550  
Current liabilities (299,029) (294,569)  
Series of Individually Immaterial Business Acquisitions [Member]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract]      
Accounts receivable, net 3,558 3,836  
Materials and supplies 556 312  
Equipment and property, net 7,374 3,027  
Goodwill 25,605 87,261  
Customer contracts 62,228 60,695  
Other intangible assets 6,936 20,086  
Current liabilities (21,536) (30,344)  
Other assets and liabilities, net (3,089) 1,209  
Total consideration paid 81,632 146,082  
Less: Contingent consideration liability (4,863) (15,893)  
Total cash purchase price $ 76,769 $ 130,189