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The preliminary values of major classes of assets acquired and liabilities assumed recorded at the date of acquisition, as adjusted during the valuation period (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Business Acquisition [Line Items]    
Materials & supplies $ 17,500 $ 15,788
Goodwill 570,759 $ 368,481
Finite-lived Intangible Assets Acquired 397,495  
Customer Contracts [Member]    
Business Acquisition [Line Items]    
Finite-lived Intangible Assets Acquired $ 283,830  
Customer Contracts [Member] | Minimum [Member]    
Business Acquisition [Line Items]    
Finite lived intangible assets useful life 3 years  
Customer Contracts [Member] | Maximum [Member]    
Business Acquisition [Line Items]    
Finite lived intangible assets useful life 12 years  
Trademarks and Trade Names [Member]    
Business Acquisition [Line Items]    
Finite-lived Intangible Assets Acquired $ 102,657  
Trademarks and Trade Names [Member] | Maximum [Member]    
Business Acquisition [Line Items]    
Finite lived intangible assets useful life 20 years  
Noncompete Agreements [Member]    
Business Acquisition [Line Items]    
Finite-lived Intangible Assets Acquired $ 4,877  
Noncompete Agreements [Member] | Minimum [Member]    
Business Acquisition [Line Items]    
Finite lived intangible assets useful life 3 years  
Noncompete Agreements [Member] | Maximum [Member]    
Business Acquisition [Line Items]    
Finite lived intangible assets useful life 20 years  
Patents [Member]    
Business Acquisition [Line Items]    
Finite-lived Intangible Assets Acquired $ 1,613  
Patents [Member] | Minimum [Member]    
Business Acquisition [Line Items]    
Finite lived intangible assets useful life 3 years  
Patents [Member] | Maximum [Member]    
Business Acquisition [Line Items]    
Finite lived intangible assets useful life 15 years  
Other Intangible Assets [Member]    
Business Acquisition [Line Items]    
Finite-lived Intangible Assets Acquired $ 2,291  
Finite lived intangible assets useful life 10 years  
Internet Domain Names [Member]    
Business Acquisition [Line Items]    
Finite-lived Intangible Assets Acquired $ 2,227  
Acquisitions [Member]    
Business Acquisition [Line Items]    
Accounts receivable, net 8,535  
Materials & supplies 1,378  
Equipment and property 68,704  
Goodwill 201,443  
Customer contracts and other intangible assets 189,581  
Current liabilities (18,180)  
Other assets and liabilities, net (7,512)  
Total purchase price 443,949  
Less: Contingent consideration liability (12,700)  
Total cash purchase price $ 431,249