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Fair value measurements - Book and Fair Values (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Summary of marketable securities, secured notes payable, unsecured senior line of credit, unsecured term loans, and unsecured senior convertible notes    
Secured notes payable $ 205,198 $ 230,925
Unsecured senior notes payable 8,316,678 7,232,370
Unsecured senior line of credit and commercial paper 269,990 99,991
Book Value    
Summary of marketable securities, secured notes payable, unsecured senior line of credit, unsecured term loans, and unsecured senior convertible notes    
Secured notes payable 205,198 230,925
Unsecured senior notes payable 8,316,678 7,232,370
Commercial paper program | Book Value    
Summary of marketable securities, secured notes payable, unsecured senior line of credit, unsecured term loans, and unsecured senior convertible notes    
Commercial Paper 269,990 99,991
Unsecured senior line of credit | Book Value    
Summary of marketable securities, secured notes payable, unsecured senior line of credit, unsecured term loans, and unsecured senior convertible notes    
Unsecured senior line of credit and commercial paper 0 0
Fair value measured on nonrecurring basis | Fair Value    
Summary of marketable securities, secured notes payable, unsecured senior line of credit, unsecured term loans, and unsecured senior convertible notes    
Secured notes payable, fair value disclosure 214,097 249,782
Unsecured senior notes payable, fair value disclosure 8,995,913 8,447,845
Fair value measured on nonrecurring basis | Commercial paper program | Fair Value    
Summary of marketable securities, secured notes payable, unsecured senior line of credit, unsecured term loans, and unsecured senior convertible notes    
Commercial paper, fair value disclosure 269,994 99,998
Fair value measured on nonrecurring basis | Unsecured senior line of credit | Fair Value    
Summary of marketable securities, secured notes payable, unsecured senior line of credit, unsecured term loans, and unsecured senior convertible notes    
Unsecured senior line of credit, fair value disclosure 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair value measured on nonrecurring basis | Commercial paper program | Fair Value    
Summary of marketable securities, secured notes payable, unsecured senior line of credit, unsecured term loans, and unsecured senior convertible notes    
Commercial paper, fair value disclosure 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair value measured on nonrecurring basis | Unsecured senior line of credit | Fair Value    
Summary of marketable securities, secured notes payable, unsecured senior line of credit, unsecured term loans, and unsecured senior convertible notes    
Unsecured senior line of credit, fair value disclosure 0 0
Significant Other Observable Inputs (Level 2) | Fair value measured on nonrecurring basis | Fair Value    
Summary of marketable securities, secured notes payable, unsecured senior line of credit, unsecured term loans, and unsecured senior convertible notes    
Secured notes payable, fair value disclosure 214,097 249,782
Unsecured senior notes payable, fair value disclosure 8,995,913 8,447,845
Significant Other Observable Inputs (Level 2) | Fair value measured on nonrecurring basis | Commercial paper program | Fair Value    
Summary of marketable securities, secured notes payable, unsecured senior line of credit, unsecured term loans, and unsecured senior convertible notes    
Commercial paper, fair value disclosure 269,994 99,998
Significant Other Observable Inputs (Level 2) | Fair value measured on nonrecurring basis | Unsecured senior line of credit | Fair Value    
Summary of marketable securities, secured notes payable, unsecured senior line of credit, unsecured term loans, and unsecured senior convertible notes    
Unsecured senior line of credit, fair value disclosure 0 0
Significant Unobservable Inputs (Level 3) | Fair value measured on nonrecurring basis | Commercial paper program | Fair Value    
Summary of marketable securities, secured notes payable, unsecured senior line of credit, unsecured term loans, and unsecured senior convertible notes    
Commercial paper, fair value disclosure 0 0
Significant Unobservable Inputs (Level 3) | Fair value measured on nonrecurring basis | Unsecured senior line of credit | Fair Value    
Summary of marketable securities, secured notes payable, unsecured senior line of credit, unsecured term loans, and unsecured senior convertible notes    
Unsecured senior line of credit, fair value disclosure $ 0 $ 0