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LONG-TERM DEBT AND LINES OF CREDIT - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Feb. 26, 2021
Dec. 31, 2020
Debt Instrument [Line Items]        
Proceeds from long-term debt $ 1,987,005 $ 607,000    
Interest expense 81,200 $ 81,100    
Interest rate swap        
Debt Instrument [Line Items]        
Accumulated other comprehensive income (loss) related to interest rate 38,300      
Senior Notes and Term Loans        
Debt Instrument [Line Items]        
Unamortized debt issuance costs 53,800      
Senior Notes        
Debt Instrument [Line Items]        
Unamortized discount 9,300     $ 8,500
Long-term debt 7,500,000      
Fair value of debt instrument $ 7,800,000      
Senior Notes | 1.200% senior notes due March 1, 2026        
Debt Instrument [Line Items]        
Face amount of debt instrument     $ 1,100,000  
Stated interest rate (as a percent) 1.20%   1.20%  
Debt issuance costs     $ 8,600  
Term Loans        
Debt Instrument [Line Items]        
Unamortized debt issuance costs       47,400
Unsecured Debt | Unsecured revolving credit facility        
Debt Instrument [Line Items]        
Unamortized debt issuance costs $ 12,600      
Unsecured Debt | Unsecured term loan facility        
Debt Instrument [Line Items]        
Minimum leverage ratio 3.50      
Minimum interest coverage ratio 3.00      
Line of credit        
Debt Instrument [Line Items]        
Unamortized debt issuance costs       $ 13,800