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Acquisition of Business (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Nov. 09, 2018
Business Acquisition [Line Items]        
REVENUES $ 348,183 $ 203,040    
Goodwill 395,974   $ 390,745  
Business Combination, Acquisition Related Costs 373 0    
Long-term Debt 1,408,133   1,401,252  
Pro Forma [Member]        
Business Acquisition [Line Items]        
Depreciation   $ 2,600    
Revolving Credit Facility [Member]        
Business Acquisition [Line Items]        
Long-term Debt $ 475,000   $ 475,000  
Line of Credit Facility, Accordion Feature Amount       $ 400,000
Senior Notes 2nd Term Loan [Member]        
Business Acquisition [Line Items]        
Long-term Debt       $ 675,000