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Credit Facility and Other Long Term Debt - Credit Facility (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Mar. 08, 2019
USD ($)
May 31, 2021
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
May 31, 2020
USD ($)
Debt Instrument [Line Items]              
Outstanding under credit facility     $ 1,100,000,000 $ 680,919,000 $ 1,100,000,000 $ 1,100,000,000  
LIBOR | Minimum              
Debt Instrument [Line Items]              
Variable rate       1.25%      
LIBOR | Maximum              
Debt Instrument [Line Items]              
Variable rate       1.75%      
Base Rate | Minimum              
Debt Instrument [Line Items]              
Variable rate       0.25%      
Base Rate | Maximum              
Debt Instrument [Line Items]              
Variable rate       0.75%      
Letter of Credit              
Debt Instrument [Line Items]              
Maximum borrowing capacity       $ 50,000,000      
Letters of credit outstanding     15,500,000 4,400,000 15,500,000 4,300,000  
Credit Agreement              
Debt Instrument [Line Items]              
Maximum borrowing capacity       300,000,000      
Credit Agreement | Revolving Credit Facility              
Debt Instrument [Line Items]              
Credit agreement, term 5 years            
Maximum borrowing capacity $ 1,250,000,000           $ 1,100,000,000
Outstanding under credit facility     $ 0 $ 0 $ 0 $ 0  
Covenant, consolidated EBITDA to consolidated interest expense ratio, greater than or equal   3.50          
Debt, leverage covenant, consolidated total indebtedness to consolidated EBITDA ratio less than or equal   3.25          
Weighted average interest rate (percent)     2.10%   2.30%    
Commitment fee percentage       0.25%