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Indebtedness - Narrative (Details)
12 Months Ended
Sep. 18, 2019
USD ($)
Feb. 02, 2018
USD ($)
Oct. 29, 2017
USD ($)
Oct. 26, 2017
USD ($)
Apr. 24, 2017
USD ($)
Mar. 15, 2017
USD ($)
Jan. 13, 2017
USD ($)
Dec. 31, 2019
USD ($)
extension
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Feb. 27, 2020
USD ($)
Sep. 20, 2019
USD ($)
Debt Instrument [Line Items]                        
Unsecured revolving credit facility               $ 377,000,000 $ 177,000,000      
Unsecured term loan, net               397,889,000 397,292,000      
Senior unsecured notes, net               5,287,658,000 3,598,295,000      
Proceeds from issuance of senior unsecured notes, after discounts and premiums               1,693,879,000 389,976,000 $ 989,890,000    
Repurchase of convertible senior unsecured notes               0 0 8,478,000    
Loss on early extinguishment of debt               $ 8,451,000 $ 160,000 $ 146,000    
Senior Unsecured Notes, due 2027 at 4.95%                        
Debt Instrument [Line Items]                        
Interest rate stated percentage               4.95%        
Senior Unsecured Notes, due 2028 at 3.95%                        
Debt Instrument [Line Items]                        
Interest rate stated percentage               3.95%        
Senior Unsecured Notes, due 2030 at 4.375%                        
Debt Instrument [Line Items]                        
Interest rate stated percentage               4.375%        
Revolving credit facility                        
Debt Instrument [Line Items]                        
Unsecured revolving credit facility               $ 377,000,000        
Unsecured revolving credit facility maximum borrowing capacity               $ 1,000,000,000        
Number of extension options | extension               2        
Extension term               6 months        
Credit facility fee percentage               0.25%        
Interest rate (as a percent)               2.80% 3.14%      
Weighted average interest rate for borrowings (as a percent)               3.21% 3.06% 2.24%    
Remaining borrowing capacity               $ 623,000,000        
Revolving credit facility | London Interbank Offered Rate (LIBOR)                        
Debt Instrument [Line Items]                        
Basis points               1.20%        
Revolving credit facility | Subsequent event                        
Debt Instrument [Line Items]                        
Unsecured revolving credit facility                     $ 437,000,000  
Remaining borrowing capacity                     $ 563,000,000  
Unsecured debt                        
Debt Instrument [Line Items]                        
Unsecured term loan, net               $ 400,000,000        
Interest rate (as a percent)               3.04% 3.45%      
Weighted average interest rate for borrowings (as a percent)               3.43% 3.12% 2.27%    
Unsecured term loan facility, borrowing capacity                       $ 2,000,000,000
Unsecured debt | London Interbank Offered Rate (LIBOR)                        
Debt Instrument [Line Items]                        
Basis points               1.35%        
Senior notes                        
Debt Instrument [Line Items]                        
Senior unsecured notes, net               $ 5,350,000,000        
Principal amount             $ 600,000,000          
Proceeds from issuance of senior unsecured notes, after discounts and premiums             593,228,000          
Proceeds from debt $ 1,680,461,000                      
Senior notes | Senior Notes, due 2023 at 4.5%                        
Debt Instrument [Line Items]                        
Principal amount             $ 200,000,000          
Interest rate stated percentage             4.50%          
Senior notes | Senior Unsecured Notes, due 2027 at 4.95%                        
Debt Instrument [Line Items]                        
Principal amount             $ 400,000,000          
Interest rate stated percentage             4.95%          
Senior notes | Convertible senior notes, due 2027 at 3.8%                        
Debt Instrument [Line Items]                        
Interest rate stated percentage           3.80%            
Repurchase of convertible senior unsecured notes         $ 47,000 $ 8,431,000            
Senior notes | Senior Unsecured Notes, due 2028 at 3.95%                        
Debt Instrument [Line Items]                        
Principal amount       $ 400,000,000                
Interest rate stated percentage       3.95%                
Proceeds from issuance of senior unsecured notes, after discounts and premiums       $ 388,244,000                
Senior notes | Senior Notes, due 2018 at 6.7%                        
Debt Instrument [Line Items]                        
Interest rate stated percentage     6.70%                  
Repurchased face amount     $ 350,000,000                  
Debt redeemed     $ 356,774,000                  
Loss on early extinguishment of debt                   $ 146,000    
Senior notes | Senior Unsecured Notes, due 2030 at 4.375%                        
Debt Instrument [Line Items]                        
Principal amount   $ 400,000,000                    
Interest rate stated percentage   4.375%                    
Proceeds from issuance of senior unsecured notes, after discounts and premiums   $ 386,400,000                    
Senior notes | Unsecured senior notes due 2024                        
Debt Instrument [Line Items]                        
Principal amount $ 825,000,000                      
Interest rate stated percentage 4.35%                      
Senior notes | Unsecured senior notes due 2026                        
Debt Instrument [Line Items]                        
Principal amount $ 450,000,000                      
Interest rate stated percentage 4.75%                      
Senior notes | Unsecured senior notes due 2029                        
Debt Instrument [Line Items]                        
Principal amount $ 425,000,000                      
Interest rate stated percentage 4.95%                      
Unsecured revolving credit facility and term loan                        
Debt Instrument [Line Items]                        
Accordion feature, increase borrowing limit               $ 2,300,000,000