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Secured and Unsecured Debt of the Company - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total secured debt	$ 248,367	$ 253,582
Unsecured debt
Debt Instrument [Line Items]
Long-term debt	$ 3,800,000	$ 3,700,000

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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