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Book and Fair Values (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Summary of marketable securities, secured notes payable, unsecured senior line of credit, unsecured term loans, and unsecured senior convertible notes    
Secured notes payable $ 349,352 $ 630,547
Unsecured senior notes payable 6,044,127 4,292,293
Unsecured senior line of credit 384,000 208,000
Unsecured senior bank term loans 0 347,415
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 349,352 630,547
Unsecured senior notes payable 6,044,127 4,292,293
Unsecured senior line of credit 384,000 208,000
Unsecured senior bank term loans 0 347,415
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 363,344 638,860
Unsecured senior notes payable 6,571,668 4,288,335
Unsecured senior line of credit $ 383,928 208,106
Unsecured senior bank term loans   $ 350,240