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Debt, Credit Agreement (Details) - USD ($)
$ in Thousands
6 Months Ended
Apr. 18, 2018
Jun. 30, 2019
Jun. 30, 2018
Debt [Abstract]      
Proceeds from debt   $ 130,000 $ 582,398
Credit Agreement [Member] | Maximum [Member]      
Debt [Abstract]      
Consolidated leverage ratio   2.25  
Credit Agreement [Member] | Minimum [Member]      
Debt [Abstract]      
Consolidated interest coverage ratio   3.00  
Term Loan Facility [Member]      
Debt [Abstract]      
Original principal amount $ 400,000 $ 400,000  
Term of loan   5 years  
Term Loan Facility [Member] | First Year [Member]      
Debt [Abstract]      
Annual amortization percentage   5.00%  
Term Loan Facility [Member] | Second Year [Member]      
Debt [Abstract]      
Annual amortization percentage   5.00%  
Term Loan Facility [Member] | Third Year [Member]      
Debt [Abstract]      
Annual amortization percentage   7.50%  
Term Loan Facility [Member] | Fourth Year [Member]      
Debt [Abstract]      
Annual amortization percentage   7.50%  
Term Loan Facility [Member] | Fifth Year [Member]      
Debt [Abstract]      
Annual amortization percentage   10.00%  
Term Loan Facility [Member] | LIBOR [Member]      
Debt [Abstract]      
Basis spread on variable rate   2.25%  
Revolving Credit Facility [Member]      
Debt [Abstract]      
Borrowing capacity 350,000    
Term of loan   5 years  
Proceeds from debt $ 78,500    
Revolving Credit Facility [Member] | LIBOR [Member]      
Debt [Abstract]      
Basis spread on variable rate   2.25%