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DEBT - Credit Agreement Narrative (Details)
3 Months Ended 9 Months Ended
Sep. 09, 2019
USD ($)
property
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
CAD ($)
Sep. 09, 2019
CAD ($)
property
Debt Instrument [Line Items]              
Loss on extinguishment of debt   $ 913,000 $ 139,000 $ 1,760,000 $ 531,000    
Fifth amended and restated credit agreement | Revolving Credit Facility              
Debt Instrument [Line Items]              
Borrowing capacity $ 1,000,000,000            
Borrowing capacity in certain foreign currencies (up to) $ 175,000,000            
Number of extension options | property 2           2
Extension period 6 months            
Amount outstanding under credit facility   0   0      
Available borrowing capacity   $ 1,000,000,000   $ 1,000,000,000      
Interest rate   1.18%   1.18%   1.18%  
Fifth amended and restated credit agreement | Revolving Credit Facility | Minimum              
Debt Instrument [Line Items]              
Annum percent unused borrowing fee 0.125%            
Fifth amended and restated credit agreement | Revolving Credit Facility | Maximum              
Debt Instrument [Line Items]              
Annum percent unused borrowing fee 0.30%            
Fifth amended and restated credit agreement | Revolving Credit Facility | Prime Rate              
Debt Instrument [Line Items]              
Basis spread on variable rate 0.50%            
Fifth amended and restated credit agreement | Revolving Credit Facility | Base Rate              
Debt Instrument [Line Items]              
Basis spread on variable rate 1.00%            
Fifth amended and restated credit agreement | Revolving Credit Facility | Base Rate | Minimum              
Debt Instrument [Line Items]              
Basis spread on variable rate 0.00%            
Fifth amended and restated credit agreement | Revolving Credit Facility | Base Rate | Maximum              
Debt Instrument [Line Items]              
Basis spread on variable rate 0.45%            
Fifth amended and restated credit agreement | Revolving Credit Facility | LIBOR | Minimum              
Debt Instrument [Line Items]              
Basis spread on variable rate 0.775%            
Fifth amended and restated credit agreement | Revolving Credit Facility | LIBOR | Maximum              
Debt Instrument [Line Items]              
Basis spread on variable rate 1.45%            
Fifth amended and restated credit agreement | Line of Credit              
Debt Instrument [Line Items]              
Borrowing capacity $ 2,750,000,000            
U.S. dollar term loan | Fifth amended and restated credit agreement              
Debt Instrument [Line Items]              
Aggregate principal amount $ 500,000,000            
Loss on extinguishment of debt   $ 900,000   $ 1,800,000      
Interest rate   1.33%   1.33%   1.33%  
U.S. dollar term loan | Fifth amended and restated credit agreement | Interest rate swaps              
Debt Instrument [Line Items]              
Aggregate principal amount   $ 436,300,000   $ 436,300,000      
Fixed interest rate under swap   1.14%   1.14%   1.14%  
U.S. dollar term loan | Fifth amended and restated credit agreement | Base Rate | Minimum              
Debt Instrument [Line Items]              
Basis spread on variable rate 0.00%            
U.S. dollar term loan | Fifth amended and restated credit agreement | Base Rate | Maximum              
Debt Instrument [Line Items]              
Basis spread on variable rate 0.65%            
U.S. dollar term loan | Fifth amended and restated credit agreement | LIBOR | Minimum              
Debt Instrument [Line Items]              
Basis spread on variable rate 0.85%            
U.S. dollar term loan | Fifth amended and restated credit agreement | LIBOR | Maximum              
Debt Instrument [Line Items]              
Basis spread on variable rate 1.65%            
Canadian dollar term loan | Fifth amended and restated credit agreement              
Debt Instrument [Line Items]              
Aggregate principal amount           $ 125,000,000 $ 125,000,000
Interest rate   1.68%   1.68%   1.68%  
Canadian dollar term loan | Fifth amended and restated credit agreement | Interest rate swaps              
Debt Instrument [Line Items]              
Aggregate principal amount           $ 125,000,000  
Fixed interest rate under swap   1.10%   1.10%   1.10%  
Canadian dollar term loan | Fifth amended and restated credit agreement | CDOR | Minimum              
Debt Instrument [Line Items]              
Basis spread on variable rate 0.85%            
Canadian dollar term loan | Fifth amended and restated credit agreement | CDOR | Maximum              
Debt Instrument [Line Items]              
Basis spread on variable rate 1.65%