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Summary of Fair Value of Financial Instruments (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Maximum maturity term of financial assets (in days) 90 days  
Indebtedness, Carrying value $ 1,237,500 $ 1,180,750
Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Indebtedness, Carrying value $ 1,239,268 $ 1,172,312
Minimum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total indebtedness fair value variance from carrying value (as a percent) 85.90% 87.20%
Maximum    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total indebtedness fair value variance from carrying value (as a percent) 95.00% 96.40%