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DEBT AND BORROWINGS (Credit Agreement) (Details) - Amended Credit Agreement
3 Months Ended 6 Months Ended 9 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
USD ($)
Mar. 31, 2020
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
Feb. 06, 2018
USD ($)
Unsecured revolving credit facility                  
Line of Credit Facility [Line Items]                  
Revolving credit facility                 $ 1,000,000,000
Line of credit facility outstanding       $ 280,000,000   $ 293,000,000      
Letters of credit outstanding           6,394,000      
Write off of unamortized issuance costs             $ 973,000    
Term Loan                  
Line of Credit Facility [Line Items]                  
Revolving credit facility                 300,000,000
Additional borrowing capacity                 $ 400,000,000
Consolidated leverage ratio     3.75 4.0 4.50     4.75  
Interest coverage ratio         3.0        
Available borrowing capacity           $ 700,606,000      
Weighted average interest rate           1.40%      
Term Loan | Minimum                  
Line of Credit Facility [Line Items]                  
Commitment fee percentage           0.20%      
Term Loan | Maximum                  
Line of Credit Facility [Line Items]                  
Commitment fee percentage           0.45%      
Term Loan | Forecast                  
Line of Credit Facility [Line Items]                  
Interest coverage ratio 4.0 3.75              
Term Loan | Eurocurrency Rate | Minimum                  
Line of Credit Facility [Line Items]                  
Basis spread on variable rate           0.875%      
Term Loan | Eurocurrency Rate | Maximum                  
Line of Credit Facility [Line Items]                  
Basis spread on variable rate           2.50%      
Term Loan | Base Rate | Minimum                  
Line of Credit Facility [Line Items]                  
Basis spread on variable rate           0.00%      
Term Loan | Base Rate | Maximum                  
Line of Credit Facility [Line Items]                  
Basis spread on variable rate           1.50%