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Unsecured Line of Credit Payable - Revolving Credit Facility Borrowings and Repayments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 27, 2021
Mar. 31, 2018
Sep. 30, 2021
Sep. 30, 2020
Line of Credit [Roll Forward]        
Beginning balance     $ 42,000  
Borrowings     (42,000) $ 130,000
Ending balance     0  
Revolving Credit Facility        
Line of Credit [Roll Forward]        
Beginning balance     42,000  
Borrowings     108,000  
Repayments $ (150,000) $ (100,000) (150,000)  
Ending balance     $ 0