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Secured and Unsecured Debt of the Company - Narrative (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Secured debt $ 253,582 $ 258,593
Unsecured debt [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 3,700,000 $ 3,300,000