Quarterly report pursuant to Section 13 or 15(d)

BUSINESS COMBINATIONS - Assets Acquired and Liabilities Assumed (Details)

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BUSINESS COMBINATIONS - Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]    
Goodwill $ 364,606 $ 346,514
Series of Individually Immaterial Business Acquisitions    
Business Acquisition [Line Items]    
Accounts Receivable 1,536  
Current Assets 273  
Equipment and property 3,591  
Goodwill 33,613  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill 18,225  
Current liabilities (9,310)  
Long-term liabilities (490)  
Total consideration paid 47,438  
Less: Contingent consideration liability (4,284)  
Total cash purchase price $ 43,154