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Acquisition of Business (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Nov. 09, 2018
Business Acquisition [Line Items]            
REVENUES $ 366,073 $ 204,919 $ 1,048,832 $ 611,566    
Goodwill 395,974   395,974   $ 390,745  
Business Combination, Acquisition Related Costs 0 0 373 0    
Long-term Debt 1,451,537   1,451,537   1,401,252  
Pro Forma [Member]            
Business Acquisition [Line Items]            
Depreciation   $ 2,600   $ 7,900    
Revolving Credit Facility [Member]            
Business Acquisition [Line Items]            
Long-term Debt $ 530,000   $ 530,000   $ 475,000  
Line of Credit Facility, Accordion Feature Amount           $ 300,000
Senior Notes 2nd Term Loan [Member]            
Business Acquisition [Line Items]            
Long-term Debt           $ 675,000