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Long-Term Debt, Schedule of Aggregate Payments Due on The Long-Term Debt (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Long-Term Debt [Abstract]      
2021 $ 40,000    
2022 0    
2023 381,250,000    
2024 593,750,000    
2025 0    
Thereafter 500,000,000    
Long-term Debt 1,475,040,000 $ 1,375,016,000  
Long-term Debt [Abstract]      
Term loan 1,468,586,000 1,369,767,000  
Payments on long-term debt 150,000,000 125,000,000 $ 0
Revolving Credit Facility [Member]      
Long-Term Debt [Abstract]      
Long-term Debt [1] 250,000,000 $ 0  
Long-term Debt [Abstract]      
Maximum borrowing capacity $ 850,000,000    
Credit facility, expiration date Mar. 27, 2024    
Basis spread on variable rate 1.50% 2.90%  
Commitment amount $ 25,000,000    
Revolving Credit Facility [Member] | LIBOR [Member]      
Long-term Debt [Abstract]      
Basis spread on variable rate 1.125%    
Revolving Credit Facility [Member] | Alternate Base Rate [Member]      
Long-term Debt [Abstract]      
Basis spread on variable rate 0.125%    
Letter of Credit [Member]      
Long-term Debt [Abstract]      
Credit facility, amount outstanding $ 5,063,000    
Term Loan [Member]      
Long-Term Debt [Abstract]      
Long-term Debt [1] $ 375,000,000 $ 375,000,000  
Long-term Debt [Abstract]      
Credit facility, expiration date Mar. 27, 2024    
Basis spread on variable rate 1.50% 2.90%  
Debt instrument, frequency of periodic payment quarterly    
Term loan $ 343,750,000    
Payments on long-term debt   $ 125,000,000  
[1] Variable interest rate of 1.5% and 2.9% at December 31, 2020 and 2019, respectively.