Annual report pursuant to Section 13 and 15(d)

Unsecured Lines of Credit Payable - Revolving Credit Facility Borrowings and Repayments (Details)

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Unsecured Lines of Credit Payable - Revolving Credit Facility Borrowings and Repayments (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Line of Credit [Roll Forward]  
Balance at December 31, 2018 $ 188,000
Balance at December 31, 2019 56,000
Revolving Credit Facility  
Line of Credit [Roll Forward]  
Balance at December 31, 2018 188,000
Borrowings 687,000
Repayments (819,000)
Balance at December 31, 2019 $ 56,000