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Summary of Fair Value of Financial Instruments (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Maximum maturity term of financial assets (in days) 90 days  
Indebtedness, Carrying value $ 1,180,750 $ 1,128,724
Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Indebtedness, Carrying value $ 1,172,312 $ 1,128,724
Minimum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total indebtedness fair value variance from carrying value (as a percent) 87.20% 78.30%
Maximum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total indebtedness fair value variance from carrying value (as a percent) 96.40% 86.60%