Annual report pursuant to Section 13 and 15(d)

Unsecured Lines of Credit Payable - Information Related to Revolving Credit Facility (Details)

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Unsecured Lines of Credit Payable - Information Related to Revolving Credit Facility (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]      
Total revolving credit facilities $ 700,000 $ 700,000 $ 600,000
Borrowings outstanding 56,000 188,000 166,000
Weighted average daily borrowings during the year 196,074 230,934 179,633
Maximum daily borrowings during the year $ 300,000 $ 429,000 $ 252,000
Weighted average interest rate during the year 3.34% 2.96% 2.15%
Weighted average interest rate on borrowings outstanding 2.73% 3.52% 2.54%